Fine structure of the extreme ultraviolet spectra of the potassium halide crystals at 10 °K

✍ Scribed by D. Blechschmidt; R. Haensel; E. E. Koch; U. Nielsen; M. Skibowski

• Book ID: 104542384
• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 416 KB
• Volume: 44
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220440238

✦ Synopsis

Abstract

The reflection spectra of KCl, KBr, and KI single crystals and of a KF film have been measured below 10 °K for photon energies between 10 and 30 eV using synchrotron radiation. The numerous new spectral features at low temperature are discussed in terms of electronic transitions from the valence band and from the K^+^3p level. Due to spin‐orbit interaction of the K^+^3p level the Γ‐K^+^3p core exciton at about 20 eV is split into two lines with an energy separation of about 0.2 eV for all halides. The observed fine structure and a comparison with a calculated conduction band density of states in the case of KI support the excitonic nature of the Γ‐X K^+^3p doublet.