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Volumn 49, Issue 9, 1994, Pages 5929-5941

Photon-excited soft-x-ray emission from LiBr and LiCl: Phonon relaxation for Li K excitations

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EID: 1542559177     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.49.5929     Document Type: Article
Times cited : (5)

References (57)
  • 12
    • 84926923018 scopus 로고    scopus 로고
    • References to numerous other SXA measurements from alkali halides are contained at the end of Ref. 11.
  • 15
    • 84926904755 scopus 로고    scopus 로고
    • Pauling's electronegativities for the series F, Cl, Br are 4.0, 3.0 and 2.8. See L. Pauling, The Nature of the Chemical Bond (Cornell University Press, Ithaca, NY, 1960), p. 63.
  • 28
    • 84926904754 scopus 로고    scopus 로고
    • The spectral features in Arakawa and Williams (Ref. 17) are presented on a logarithmic scale, which makes these features appear even broader than specified.
  • 29
    • 84926904753 scopus 로고    scopus 로고
    • We used a background function that rises in proportion to the integrated intensity of the photoemission peak (integrated toward more negative binding energy) in order to account for the asymmetry in the photoemission background. The asymmetry arises in this case from contributions of the photoexcited valence electrons to the inelastically-scattered-electron tail.
  • 36
    • 84926886052 scopus 로고    scopus 로고
    • The values given for the gap are based on the optical reflectivity measurements of Baldini and Bosacchi (Ref. 33) and are the commonly quoted values in the literature. In fact, however, the thresholds for band-gap excitations are not straightforward to extract from such reflectivity data because of valence excitonic structures preceding the thresholds. A second source of error for the band gaps is the fact that the reflectivity data of Baldini and Bosacchi were recorded at 55 K, whereas the room-temperature gaps are the relevant values for the present analysis. Haensel, Kunz, and Sonntag (Ref. 10) observed a 0.2 eV shift to higher energy for the Li K absorption spectrum of LiF when they cooled their sample from room to liquid nitrogen temperature, a manifestation of band-gap widening. The appropriate gaps for LiBr and LiCl at room temperature may thus be 0.2 eV or so smaller than listed.
  • 40
    • 84926904752 scopus 로고    scopus 로고
    • However, these authors do not focus on this aspect of the data
  • 42
    • 84926942177 scopus 로고    scopus 로고
    • A later photon-excited study of the boron compounds (Ref. 2) reported that the emission shoulder appears for a lower excitation energy than the main emission peak, thus calling the phonon ringing interpretation into question. However, since the main exciton peak in the B K emission overlaps the energy range of strong absorption in the boron compounds, has been countered that the initial appearance of only the low-energy component may be a manifestation of self-absorption [S. E. Schnatterly (private communication)].
  • 45
    • 84926942176 scopus 로고    scopus 로고
    • C. E. Moore, Atomic Energy Levels, Natl. Bur. Stand. (U.S.) Circ. No. 467 (U.S. GPO, Washington, D.C., 1949), Vol. I, p. 10.
  • 47
    • 84926923017 scopus 로고    scopus 로고
    • The difference in instrumental broadening between the photoemission and SXE spectra, 1.3 versus 0.16 eV, leads to only a small difference when added quadratically to the full intrinsic width of the valence-band spectra, but this difference was nonetheless taken into account in the alignment procedure of Figs. 2, 3, and 5.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.