Soft X-Ray Absorption Spectra of Alkali Halides. : I.. KCl and NaCl

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Soft X-ray absorption spectra of typical alkali chlorides, KCl and NaCl, were observed by using as a continuous background the synchrotron radiation from the 750MeV electron synchrotron in the Institute for Nuclear Study, Tokyo. Thc L_<2,3>-absorption spectrum of Cl^- in these chlorides has been obtained. The spectrum shows one or two sharp absorption maxima at the long wavelength limit and a rapid increase in absorption at about 9eV above the limit. A shoulder-like structure is observed at the foot of the second absorption band. A tentative X-ray energy level diagram suggests that the shoulder corresponds to the onset of interband transition from L_3 to the conduction band. The first absorption maximum is accordingly interpreted as the excitation of u stable X-ray exciton; a metastable X-ray exciton seems to be involved in the second maximum. The spectral behavior of the L_2,3-absorption near the long wavelength limit has some similarity to the optical absorption spectrum in the vacuum ultraviolet region. It is suggested that the sharp rise In absorption at about 9eV above the limit is due to two electron excitation by a single photon.
社団法人日本物理学会の論文
1966-12-05