Arisato Ejiri

Cl− L23 absorption spectra of alkali chlorides obtained at 80°K with synchrotron radiation

Abstract Cl - L 23 absorption spectra of alkali chlorides have been obtained at 80°K with a 2 m grazing incidence spectrograph. Synchrotron radiation emitted from a 1.3 GeV electron synchrotron at INS ∗ has been used as a continuum background. The experimental results are interpreted in terms of X-ray exciton, electronic band structure, and two electron excitation.

Absorption spectra of KMF3 (M = Mn, Fe, Co, Ni, Cu, Zn) in the extreme ultraviolet region

Abstract The optical absorption spectra of thin films of KMF3(M = Mn, Fe, Co, Ni, Cu, Zn) were measured in the XUV region between 8 and 35 eV. Synchroton orbital radiation was used as the continuum light source. The gross features of the spectra are alike in all of the six materials. In the spectra, the valence exciton band, the core exciton band and the charge transfer band due to the transition from the 2p state of F-ion to the 3d state of M ion are assigned. No appreciable transition from 3d state of M ion is found.

Polarization properties of an evaporated aluminum mirror in the VUV region

Measurement and calculation of the polarization properties of an evaporated Al mirror as a retardation plate of a VUV polarimeter are presented.

Density effect on structures in photoconductivity excitation spectra of supercritical xenon doped with anthracene molecules

Abstract Photoconductivity excitation spectra of liquid 2,2-dimethylbutane (2,2-DMB) and supercritical xenon doped with anthracene were measured at room temperature in an attempt to study the nature of the structure observed above the ionization threshold. For anthracene/Xe systems, spectra were measured isothermally as a function of fluid density N . Structures are observed at nearly the same energies for both anthracene/liquid 2,2-DMB and for anthracene/Xe system at N = 8 × 10 21 cm −3 . The density dependence of the structures for the anthracene/Xe systems was interpreted as due to the shift in energy by the same mechanism which gives rise to the shift in the photoconductivity threshold.

Absorption spectra of KCl and RbCl in the extreme ultraviolet region

Abstract Absorption spectra of thin films of KCl and RbCl are studied at room and liquid nitrogen temperatures in the region between 10 and 35 eV. Synchrotron orbital radiation was used as the continuum light source. In each of the spectra a multiplet band with a complicated structure is found, some peaks of which are assigned to the core exciton bands, and the separations between the peaks are interpreted by taking account of both the spin-orbit interaction and the electron-hole exchange interaction.

Photoconductivity threshold of supercritical xenon fluids doped with anthracene as a function of fluid density

Abstract The photoconductivity threshold energy I f of supercritical xenon fluids doped with anthracene was measured as a function of fluid density N from 0.03 × 10 21 to 7.5 × 10 21 cm −3 . For high densities ( N ⩾ 7 × 10 21 cm −3 ), I f values were well described by the equation I f = I g + V 0 + P , where I g is the gas-phase ionization potential of anthracene, V 0 the conduction band energy in the xenon fluids and P the polarization energy of an anthracene positive ion. The value of the ionic radius, 0.325 nm, used for the calculation of P is derived from literature data on I f in non-polar liquids. The deviation of measured I f values from the above expression is discussed.

Anomaly of L23 absorption edges in Al and Mg metals

Abstract L 23 absorption edges of aluminum and magnesium were studied at room and liquid nitrogen temperatures. Sharp peaks were observed at these edges. The peaks shifted to lower energy and sharpened as the specimen was cooled. The positions of the L 2 and L 3 edges of these metals were accurately determined; they are in good agreement with previous data of other authors.

Density effect on photoionization process in supercritical xenon fluids doped with TMAE (tetrakis-dimethylaminoethylene)

Photoconductivity threshold energy and photoionization quantum yield of xenon supercritical fluids doped with TMAE (tetrakis-dimethylaminoethylene) were measured as a function of xenon density at 300 K. Density dependence of the photoionization threshold energy was successfully described with the continuum model where the fluid is treated as a uniform continuum.

Absorption spectra of quantum well excitons in alkali halide multilayer structures

Optical absorption spectra of quantum well excitons in KCl-KBr and RbCl-KBr alternating multilayer structures are studied. The absorption bands of excitons confined in the well exhibit blue shifts and steeper rise as compared with the bulk exciton band. These spectral characters are explained in terms of the quantum confinements. A sinusoidal potential profile of the multilayer is proposed to explain the interface-mixture effect and is confirmed by the observed spectra. A simple model of the sinusoidal well is also proposed.

A cluster model to explain the ionization potential and energy positions of photocurrent structures of anthracene doped in supercritical xenon as a function of xenon density

Density-induced shift of ionization potential of anthracene doped in supercritical xenon was successfully reproduced by a cluster model. It is shown that the same cluster model can explain reasonably the density-induced shift in energy positions of photocurrent peak or shoulders for the same system.