Ultraviolet photoelectron spectra of cesium halides
Energy distributions of photoelectrons from evaporated films of cesium halides were measured at photon energies of 11 to 23 eV. The photoelectron spectra show structures that can be identified as relatively high densities of states in the Cs/sup +/ 5p core as well as in the valence and conduction bands. Doublet core states due to spin-orbit splitting are observed for all the cesium halides. The bandwidths of these states are 3.1 +- 0.3 eV for CsCl, CsBr, CsI, and 4.0 +- 0.3 eV for CsF. The valence-band widths for CsCl, CsBr, CsI, and CsF are found to be 1.8 +- 0.3, 2.1 +- 0.3, 2.4 +- 0.3, and 1.7 +- 0.3 eV, respectively. The energy distribution curves of CsBr indicate a valence-band splitting of 0.5 +- 0.2 Ev, which is consistent with the spin-orbit splitting of the Br (4p) atomic state. The photoelectron spectra also show the triplet structure associated with the excitation from the I/sup -/ 5p band of CsI as reported recently by DiStefano and Spicer. Some evidence of core-exciton decay can be seen in the spectra of CsCl. The photoemission results are used to estimate the binding energies of the GAMMA core excitons of cesium halides. (auth)
- Research Organization:
- Univ. of Hawaii, Honolulu
- OSTI ID:
- 7366378
- Journal Information:
- Phys. Rev., B; (United States), Vol. 12:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CESIUM BROMIDES
PHOTOELECTRON SPECTROSCOPY
CESIUM CHLORIDES
CESIUM FLUORIDES
CESIUM IODIDES
BINDING ENERGY
DISTRIBUTION
ENERGY
ENERGY-LEVEL DENSITY
EXCITONS
FILMS
L-S COUPLING
PHOTOEMISSION
VALENCE
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CESIUM COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COUPLING
ELECTRON SPECTROSCOPY
EMISSION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
INTERMEDIATE COUPLING
IODIDES
IODINE COMPOUNDS
PHOSPHORS
QUASI PARTICLES
SECONDARY EMISSION
SPECTROSCOPY
360603* - Materials- Properties
400201 - Chemical & Physicochemical Properties