村松 康司

To clarify the electronic structure of semiconducting boron-doped diamond, especially the two-acceptor levels observed in the soft x-ray absorption spectra in the C K region, the density of states (DOS) of a B-doped diamond cluster model, BC146H148, were calculated using discrete variational (DV)-X alpha MO methods. The results were compared to the measured x-ray spectra. In the calculations, the localized acceptor levels (lowest unoccupied molecular orbitals: (LUMOs)) appeared just above the highest occupied molecular orbitals (HOMOs) of the C atom that was directly bonded to the B atom, and the other C atoms that were bonded to the C atoms next to the B atom. However, a chemical shift of the LUMOs was not observed between the C atoms. On the other hand, a chemical shift of the occupied C 1s orbitals was observed between these C atoms. Therefore, it is concluded that the two-acceptor levels in the C atoms result from the chemical shift of the inner C 1s orbitals due to the local structure differences between the C atoms in B-doped diamond. Copyright (c) 2007 John Wiley & Sons, Ltd.

The authors performed a soft x-ray magnetic circular dichroism (XMCD) study of a Zn1-x Vx O thin film, which showed a small ferromagnetic moment. Field and temperature dependences of V 2p XMCD signals indicated the coexistence of Curie-Weiss paramagnetic and antiferromagnetic V ions, quantitatively consistent with the magnetization measurements. The authors attributed the paramagnetic signal to V ions substituting for Zn sites, which are somewhat elongated along the c axis. A possible formation of ferromagnetically dead layers in the surface region of the film is also discussed. © 2007 American Institute of Physics.

The soft x-ray absorption spectra of high-abrasion-fuurace carbon black were measured to obtain local-structure/chemical-states information of the primary particles and/or crystallites. The soft x-ray absorption spectral features of carbon black represent broader pi* and sigma* peak structures compared to highly oriented pyrolytic graphite (HOPG). ne subtracted spectra between the carbon black and HOPG, (carbon black)-(HOPG), show double-peak structures on both sides of the pi* peak. The lower-energy peak, denoted as the "pre-peak", in the subtracted spectra and the pi*/sigma* peak intensity ratio in the absorption spectra clearly depend on the specific surface area by nitrogen adsorption (NSA). Therefore, it is concluded that the pre-peak intensity and the pi*/sigma* ratio reflect the local graphitic structure of carbon black.

We have investigated the electronic structure of Cr- and Mn-doped GaN using photoemission spectros-copy (PES) and X-ray absorption spectroscopy (XAS). Cr and Mn XAS at the L-edge have indicated that the Cr and Mn ions are in the tetrahedral crystal field and that their valences are trivalent and divalent, respectively. Upon Cr and Mn doping into GaN, new states were found to form in the band-gap region of GaN. Resonant photoemission spectroscopy (RPES) has revealed that the main structure of the Cr 3d partial density of states (PDOS) appears within the band gap of GaN while that of the Mn 3d PDOS appears within the valence band of GaN and as a shoulder above the valence-band maximum of GaN, indicating that the character of the doping-induced states is different between Ga1-xCrxN and Ga1-xMnxN. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA.

We have carried out the angle-resolved photoemission experiments on some uranium compounds using soft X-ray synchrotron radiation. Bulk- and U 5f-sensitive band structure and Fermi surface were obtained for paramagnetic uranium compound UFeGa5. Although the agreement between the experimental band structure and the LDA calculation treating U 5f electrons as being itinerant is qualitative, the topology of the Fermi surface is well explained by the calculation, suggesting that the U 5f states can be essentially understood within the itinerant-electron model. (c) 2006 Elsevier B.V. All rights reserved.

Soft X-ray magnetic circular dichroism has been measured at the U N4, 5 and Fe L2, 3 absorption edges of ferromagnetic UFe2. The orbital and spin magnetic moments of U 5f and Fe 3d electrons are evaluated by a sum-rule analysis of the XMCD data. It is confirmed that the U 5f orbital moment is parallel to the Fe 3d spin moment. © 2006 Elsevier B.V. All rights reserved.

X-ray absorption magnetic circular dichroism (XMCD) at the U N 4,5 edges was measured for the ferromagnetic superconductor UGe 2 in the normal state. The orbital and spin magneic moments deduced from the sum rule analysis of the XMCD data indicate that the U atom in UGe 2 is considered to be closer to the trivalent state rather than the tetravalent state. The temperature dependence of the XMCD signal does not show any significant anomaly at T* ∼ 30 K, where the resistivity anomaly was observed at ambient pressure. The XMCD measurement at the U N 2,3 edge indicates that the U 6d electrons have negligibly small magnetic contributions. © 2006 The Physical Society of Japan.

Soft X-ray magnetic circular dichroism (XMCD) has been measured for ferromagnetic uranium monochalcogenides UXC (Xc = S, Se and Te) and UFe2. By applying the orbital and spin sum rules to the XMCD results, some trend has been found for the relationship between the ratio μl/μs and the total magnetic moment. © 2006 The Physical Society of Japan.

We have performed angle-resolved photoemission spectroscopy experiments on paramagnetic UFeGa5 using soft x-ray synchrotron radiation (hν=500 eV) and derived the bulk- and U 5f -sensitive electronic structure of UFeGa5. Although the agreement between the experimental band structure and the local density approximation calculation treating U 5f electrons as being itinerant is qualitative, the morphology of the Fermi surface is well-explained by the calculation, suggesting that the U 5f states can be essentially understood within the itinerant-electron model. © 2006 The American Physical Society.

We report on the results of x-ray absorption, x-ray magnetic circular dichroism (XMCD), and photoemission experiments on Zn1-xCoxO (x=0.05) thin film, which shows ferromagnetism at room temperature. The XMCD spectra show multiplet structures, characteristic of the Co2+ ion tetrahedrally coordinated by oxygen, suggesting that the ferromagnetism comes from Co ions substituting the Zn site in ZnO. The magnetic field and temperature dependences of the XMCD spectra imply that the nonferromagnetic Co ions are strongly coupled antiferromagnetically with each other. © 2005 The American Physical Society.

The effects of weathering on carbon films deposited on Japanese smoked roof tiles were investigated by soft x-ray absorption and emission spectroscopy using synchrotron radiation. X-ray absorption measurements revealed that weathering oxidizes the carbon films and that partial carboxy chemical bonding occurs. Incident angle-dependent x-ray absorption spectra in the C K region confirmed that the degree of the orientation at the surface of the oxidized carbon films decreases with weathering. However, the take-off angle-dependent C K x-ray emission spectra showed that the orientation of the layered carbon structure is maintained in the bulk portion when weathered. Therefore, it is confirmed that oxidation proceeds from the surface of the carbon films. Weathering degrades and oxidizes the surface carbon films, which causes the metallic silver color to change to darker gray. Copyright © 2005 John Wiley & Sons, Ltd.

The electronic structure transition between the semiconducting and metallic states in boron (B)-doped diamonds was element-selectively observed by soft X-ray emission and absorption spectroscopy using synchrotron radiation. For lightly B-doped diamonds, the B 2p-density of states (DOS) in the valence band was enhanced with a steep-edge feature near the Fermi level, and localized acceptor levels, which are characteristic of semiconductors, were clearly observed both in B 2p- and C 2p-DOS in the conduction bands. For heavily B-doped diamonds, the localized acceptor levels developed into extended energy levels and the new energy levels generated formed an extended conduction band structure that overlapped with the valence band. Thus, the metallic energy band structure is actually formed by heavy boron doping. These valence and conduction band structures observed by soft X-ray emission and absorption spectroscopy accounted for the electrical properties of B-doped diamonds. © 2005 The Japan Society of Applied Physics.

We have studied the electronic structure of the diluted magnetic semiconductor Ga1-x Mnx N (x=0.0, 0.02, and 0.042) grown on Sn-doped n -type GaN using photoemission and soft x-ray absorption spectroscopy. Mn L -edge x-ray absorption have indicated that the Mn ions are in the tetrahedral crystal field and that their valence is divalent. Upon Mn doping into GaN, new states were found to form within the band gap of GaN, and the Fermi level was shifted downward. Satellite structures in the Mn 2p core level and the Mn 3d partial density of states were analyzed using configuration-interaction calculation on a Mn N4 cluster model. The deduced electronic structure parameters reveal that the p-d exchange coupling in Ga1-x Mnx N is stronger than that in Ga1-x Mnx As. © 2005 The American Physical Society.

We have studied the electronic structure of the diluted magnetic semiconductor Ga1-xMnxN (x=0.0, 0.02, and 0.042) grown on Sn-doped n-type GaN using photoemission and soft x-ray absorption spectroscopy. Mn L-edge x-ray absorption have indicated that the Mn ions are in the tetrahedral crystal field and that their valence is divalent. Upon Mn doping into GaN, new states were found to form within the band gap of GaN, and the Fermi level was shifted downward. Satellite structures in the Mn 2p core level and the Mn 3d partial density of states were analyzed using configuration-interaction calculation on a MnN4 cluster model. The deduced electronic structure parameters reveal that the p-d exchange coupling in Ga1-xMnxN is stronger than that in Ga1-xMnxAs.

An overview is given on the photoemission studies of the electronic structure of diluted magnetic semiconductors (DMS's), in particular of the prototypical ferromagnetic DMS Ga1-xMnxAs. Configuration-interaction cluster-model analyses of the photoemission data allow us to estimate the p-d exchange coupling constant and hence to predict how to increase the Curie temperature in new materials. Spectra near the Fermi level combined with the transport and optical properties suggest a highly incoherent metallic state for the ferromagnetic metallic phase. It is shown that new insight into the chemically and magnetically inhomogeneous states of DMS's can be gained by the temperature and magnetic field dependence of core-level magnetic circular dichroism signals. © 2005 Elsevier B.V. All rights reserved.

Soft X-ray emission spectra in the Ar L region of various solid substrates doped with Ar atoms were measured to investigate the chemical states of the Ar atoms in the solid matrices. Ar ions were implanted into the solid matrices of Si(1 1 1), SiO2, highly oriented pyrolytic graphite (HOPG), Ti, Cr, Ni, and Cu with an acceleration voltage of 5 kV at room temperature. Soft X-ray emission spectra in the Ar L region were measured using synchrotron radiation. Low-energy tailing was observed at the L3-M1 and L 2-M1 X-ray emission peaks in Ar-doped transition metals. The density of states (DOS) of the Ar 3s orbitals indicated that the low-energy tailed DOS can be formed by hybridization with 3d orbitals in the overpressurized Ar clusters. © 2005 Elsevier B.V. All rights reserved.

The antiferromagnetic-to-ferromagnetic transition in SrFe1-xCoxO3 (x(c)similar or equal to 0.15) induced by Co doping has been studied by magnetic circular x-ray dichroism. The orbital and spin magnetic moments of the Fe and Co 3d states under the magenetic field of 2 T are found to show different x dependences: The spin polarization of Fe 3d gradually increases with Co concentration; on the other hand, a large spin polarization of Co 3d is induced already in the antiferromagnetic phase, indicating that the Co moment is nearly fully alligned already in the antiferromagnetic phase. This suggests that the alignment of the Fe magnetic moment in SrFe1-xCoxO3 is induced by interaction with doped Co magnetic moment. Possible formation of ferromagnetic Co rich region is discussed.

The antiferromagnetic-to-ferromagnetic transition in SrFe 1-xCo xO 3 (x c ≃ 0.15) induced by Co doping has been studied by magnetic circular x-ray dichroism. The orbital and spin magnetic moments of the Fe and Co 3d states under the magenetic field of 2 T are found to show different x dependences: The spin polarization of Fe 3d gradually increases with Co concentration; on the other hand, a large spin polarization of Co 3d is induced already in the antiferromagnetic phase, indicating that the Co moment is nearly fully alligned already in the antiferromagnetic phase. This suggests that the alignment of the Fe magnetic moment in SrFe 1-xCo xO 3 is induced by interaction with doped Co magnetic moment. Possible formation of ferromagnetic Co rich region is discussed. ©2005 The American Physical Society.

Information about the local structure of amorphous carbon (a-C)films was obtained by comparing soft X-ray absorption spectra in the CK region of sputtered a-C films to reference carbon compounds such as hydrofullerene (C60H36), highly oriented pyrolytic graphite (HOPG), and carbon black. The spectra of the a-C films exhibited. ne structures, which consisted of at least different six portions. Comparing the spectral features of the a-C films with the reference compounds and the spectral analysis by discrete variational (DV)-X alpha molecular orbital calculations indicated that the. ne structures of the a-C films are due to a hybrid of sp(2) and sp(3) carbon atoms.

The polarization performance of a reflection-type polarizer made with a synthetic mica (fluorophlogopite) single crystal (002) in symmetric Bragg geometry was evaluated at the photon energy of 880 eV by means of the rotating-analyzer method. An experiment was performed at the undulator beamline at the SPring-8. The reflectance in the s -polarization configuration was 2.6% at an incidence angle of around 45°. As the result of the analysis based on the rotating-analyzer method, the polarizance of the polarizer and the degree of linear polarization of the incident light at 880 eV were found to be 0.997±0.002 and 0.993±0.004, respectively. © 2005 American Institute of Physics.

Surface carbon films on the Japanese smoked roof tile "Ibushi-Kawara" (hereafter "Kawara") were analyzed by angle-dependent soft X-ray emission spectroscopy using synchrotron radiation. The carbon film microstructure on typical Kawara is 50% carbon-black-like sp2 carbon atoms, which form layer-structured clusters parallel to the basal clay plane, and 50% carbon-black-like atoms, which form random-structured clusters that rigidly connect the layer-structured clusters. Weathered Kawara that has been exposed to sea breezes for numerous years was analyzed to understand the weathering effect from a microstructure point of view. The main weathering effect was the removal of the carbon film. It was also determined that the black stripes, which appear on the degraded "Susumaki" Kawara, are made from random-structured carbon black. © 2004 Elsevier B.V. All rights reserved.

First principles calculations have been carried out to investigate the core-hole effects on the theoretical fine structures of the X-ray absorption spectra of MgF2: and ZnF2 at F K-edge. Significant differences are found between the calculated spectral fine structures with and without core-holes. Experimental profiles of the near-edge X-ray absorption fine structures are well reproduced by the theoretical ones when the core-hole effect is introduced. The dependence of supercell size on the theoretical fine structures is also examined.

High-resolution CK X-ray emission spectra of polycyclic aromatic hydrocarbons (PAH) were measured using synchrotron radiation. The main peak energies in the PAH X-ray spectra shifted to a higher energy region as the ratio of hydrogenated outer carbon atoms to the non-hydrogenated inner carbon atoms increased. Discrete variational (DV)-Xα molecular orbital calculations provided theoretical confirmation that the spectral features depend on the ratio of hydrogenated/non-hydrogenated carbon atoms, which suggests that the features around the main peaks provide the information of the degree of hydrogenation in PAH compounds. © 2004 Elsevier B.V. All rights reserved.

© 2004 American Institute of Physics. Magnetic circular x-ray dichroism (MCXD) measurements in Fe 2p absorption have been done on SrFeO3, which shows a spiral anti-ferromagnetism, by using a 10-T superconducting magnet. Finite MCXD structures have been observed under magnetic field of 8 T even in the paramagnetic and anti-ferromagnetic states. The intensity of the MCXD structure at hv ∼ 710 eV increases linearly as magnetic field increases linearly and the total magnetic moments estimated by MCXD sum rules roughly corresponds to the magnetization measured by SQUID measurements. MCXD study of paramagnetic and/or anti-ferromagnetic samples can be done by using a superconducting magnet that generates a strong magnetic field enough to induce finite magnetization.

© 2004 American Institute of Physics. Total-electron-yield X-ray standing-wave (TEY-XSW) spectra of Mo/SiC/Si/SiC multilayers (Muramatsu et al., Jpn. J. Appl. Phys., 41 (2002) 4250.) were simulated by the use of the calculation method for TEY spectra of multilayers. The existence of a 2Å thick SiO2 and a 18Å thick Mo layers on the periodic Mo/SiC/Si/SiC multilayer was confirmed. In addition, the simulation study on Mo/Si multilayers covered with top Mo layers was performed. The TEY-XSW spectra were sensitive to the thickness of the top Mo layer as for the spectral shapes and peak positions. It was made clear that the TEY-XSW method is useful to elucidate the multilayer structure near the top layer.

The electronic structure of spinel-type chalcogenide CuIr2S 4, which exhibits a metal-insulator transition, has been studied by photoemission spectroscopy (PES). The valence-band PES spectra indicate a gap formation below the transition temperature TMI. The line shape of the Ir 4f core-level PES spectra shows a dramatic change across TMI, which may be associated with the variation of the Ir 5d electron states. © 2003 Elsevier B.V. All rights reserved.

Magnetic circular dichroism (MCD) has been measured at the U N 4,5 absorption edges of ferromagnetic uranium monochalcogenides US, USe and UTe. The MCD signals are weaker in US than in USe and UTe. Both the spin and orbital moments are increased in going from US to USe, and then reduced from USe to UTe. © 2003 Elsevier B.V. All rights rserved.

By analyzing angle-dependent TEY spectra measured with fluorescence spectra, the depth-dependence of the absorbed energy in a Ru/B4C reflection multilayer film was obtained as follows. The periodic multilayer structure was obtained as [Ru 24.38Å/B4C 36.57Å] and [Ru 24.06Å/B4C 36.09Å] by GIXRD and reflectance measurements respectively. The angles of incidence of the fluorescence spectra were determined as 16° and 41° using the angle dependent TEY spectra measured with the fluorescence spectra. The depth-dependence of the absorbed energy, which represents the intensity of the fluorescence spectrum, was calculated using these parameters. These results suggest that an angle-dependent TEY measurement can be used as an easy phase-determination method for standing waves that are generated by a reflection multilayer.

Carbon films on the Japanese smoked roof tile "Ibushi-Kawara" were characterized by high-resolution soft X-ray spectroscopy using synchrotron radiation. By comparing the soft X-ray emission and absorption spectra of Kawara with the reference carbon compounds, it was determined that the carbon films on Kawara consist of mostly carbon-black-like sp2 carbon atoms and that the surface also contains polyethylene-like sp3 carbon atoms. The take-off/incident-angle dependence on the X-ray emission/absorption spectra of Kawara shows that the carbon-black-like sp2 carbon atoms partially form a layer structure oriented parallel to the basal clay plane, and that the degree of orientation of the carbon films is estimated to be 50% that of highly oriented pyrolytic graphite (HOPG). The microstructure of the carbon films on Kawara is one in which half of the carbon-black-like sp2 carbon atoms form layer-structured clusters parallel to the basal clay plane and the rest of the carbon atoms form random-structured clusters which rigidly connect the layer-structured clusters.

The electronic structure of YbFe4Sbi12, which shows heavy-fermion or mixed-valence behaviour, are studied by high-resolution photoemission spectroscopy. The observed Yb2+ signal is composed of two spin-orbit doublets which might be interpreted as bulk and surface contributions. The relationship between the energy positions of the two doublets is anomalous compared to those of the conventional mixed-valence Yb compounds.

Angle-resolved soft X-ray emission and absorption spectra in the BK and NK regions of hexagonal BN were measured using polarized synchrotron radiation. The take-off/incident-angle-dependence on the spectral features in both X-ray emission and absorption is clearly observed. The configuration of the σ and π orbitals, which were calculated using discrete variational (DV)-Xα molecular orbital calculations, explains the angle-resolved soft X-ray emission and absorption spectra. The relative peak intensity of the 394-eV peak in the NK X-ray emission provides useful information about the BN layer ordering. © 2003 Elsevier Science B.V. All rights reserved.

We have performed 4d-4f (hv = 122 eV) and 3d-4f (hv = 881 eV) resonant photoemission spectroscopy studies on the heavy-fermion cerium compounds CeMIn5 (M = Rh and Ir), which show competition between superconductivity and antiferromagnetism. The results suggest that the Ce 4f electrons in both compounds are nearly localized. We have also found that although the Ce 4f electrons in the superconducting CelrIn5 are more delocalized than those in the antiferromagnetic CeRhIn5, their electronic structures are very similar to each other. © 2003 Elsevier Science B.V. All rights reserved.

We have performed angle-resolved photoemission spectroscopy (formula presented) Ce (formula presented) resonant photoemission spectroscopy (formula presented) and Ce (formula presented) x-ray absorption spectroscopy studies on the layered cerium compounds (formula presented) (formula presented) and Ir), which show competition between superconductivity and antiferromagnetism. The results suggest that the Ce (formula presented) electrons in both compounds are nearly localized. We have found that although the Ce (formula presented) electrons in the superconducting (formula presented) are more delocalized than those in the antiferromagnetic (formula presented) their electronic structures are very similar to each other. © 2003 The American Physical Society.

We have performed angle-resolved photoemission spectroscopy (hv=21.2,40.8 eV), Ce 3d-4f resonant photoemission spectroscopy (hv∼881 eV), and Ce 3d x-ray absorption spectroscopy studies on the layered cerium compounds CeTIn5 (T=Rh and Ir), which show competition between superconductivity and antiferromagnetism. The results suggest that the Ce 4f electrons in both compounds are nearly localized. We have found that although the Ce 4f electrons in the superconducting CeIrIn5 are more delocalized than those in the antiferromagnetic CeRhIn5, their electronic structures are very similar to each other.

Two kinds of soft X-ray beam splitters were fabricated for use at wavelengths around 13 nm: a Mo/Si multilayer beam splitter for near normal incidence and a Ru/SiN bilayer beam splitter for grazing incidence. In the wavelength region around 13 nm, measurements showed the Mo/Si multilayer beam splitter to have a reflectivity of 28% and a transmittance of 32% at a grazing incident angle of 80°, and the Ru/SiN bilayer beam splitter to have a reflectivity and transmittance of 11% at a grazing incident angle of 17.5°.

The development of highly reflective multilayer mirrors for use in the wavelength region around 6-nm is desired for X-ray photoemission spectroscopy for inner-shell excitation using a Schwarschild objective. For this application, reflectivity is the most critical parameter determining the performance of multilayer mirrors, because the reflectivity of multilayers in the 6-nm region is generally very low. We have fabricated the Co/C and Cr/C multilayer mirrors by magnetron sputtering. The measured peak reflectivity of the Cr/C multilayer is about 18.9% at the wavelength of 6.42 nm and the incident angle of 88° and the reflectivity of the Co/C multilayer is 10.1% at the wavelength of 6.06 nm and the incident angle of 88°. The reflectivities of the Cr/C and Co0.8Cr0.2/C multilayers are enough high. Therefore, we found that Cr/C or CoxCr1-x/C multilayer is sufficiently used for Schwarzschild mirror for X-ray photoemission spectroscopy at 6 nm X-ray.

Soft X-ray emission and absorption spectra in the Si L region of a number of substituted polysilanes, (SiR2)n, have been obtained using synchrotron radiation to investigate their electronic structures. Studied polysilanes were substituted with methyl (R = CH3), ethyl (C2H5), propyl (n-C3H7), butyl (n-C4H9), pentyl (n-C5H11) and phenyl (C6H5) groups. Although similar spectral features in both X-ray emission and absorption are observed among alkyl-substituted polysilanes, slight differences are distinguished between alkyl- and phenyl-substituted ones. These spectral features are qualitatively reproduced by summing calculated density-of-state spectra for Si3s- and Si3d-orbitals. Thus, spectral features are explained through the hybridization of electronic orbitals in both backbone Si atoms and substituent C atoms. © 2002 Elsevier Science B.V. All rights reserved.

X-ray absorption near edge structure (XANES) spectra of DNA and the nucleobases (adenine, guanine, cytosine, thymine and uracil) are observed using monochromatic soft X-rays (400-560 eV). The photon energy range includes the electron binding energy of the core orbital of nitrogen and oxygen K shell. Obtained XANES spectra showing a characteristic structure were theoretically analyzed by the discrete variational density functional formalism (DV-Xα) method. These results clearly indicate that the photo-excitation of oxygen and nitrogen 1s electron to π* orbitals shows a sharp resonance profile rather than that to σ* orbitals, enough to realize selecting a photochemical reaction site at specific nucleobases in a DNA molecule. Novel experiments are proposed based on the obtained spectra to understand the molecular mechanisms of radiation damages on DNA bases. © 2002 Elsevier Science B.V. All rights reserved.

Theoretical B K, C K and N K x-ray emission/absorption spectra of three possible graphitic-structured BC2N clusters are predicted based on the B2p-, C2p-, and N2p- density-of-states (DOS) calculated by discrete variational (DV)-Xα molecular orbital calculations. Several prominent differences in DOS spectral features among BC2Ns, h-BN, and graphite are confirmed from comparison of calculated B2p-, C2p-, and N2p-DOS spectra. These variations in the spectra allow BC2N structures to be positively identified by high-resolution x-ray emission/absorption spectroscopy in the B K, C K, and N K regions. © 2003.

© 2001 Japan Soc. Of Applied Physics. Summary form only given. Total-electron-yield (TEY) x-ray standing-wave spectra of multilayer x-ray mirrors by monitoring sample photocurrent are presented to obtain information on their interface structure. This simple TEY x-ray standing-wave method enables simultaneous spectral measurements of the x-ray standing-wave and Bragg reflection. Optical measurements of Bragg reflection and x-ray standing-waves were carried out by using the reflectometer installed in the beamline 6.3.2 at the Advanced Light Source (ALS). Results are reported for Mo/SiC/Si multilayer mirrors.