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Calculation of the Width of the Second Conduction Band in Anthracene Crystals from Photoemission Data
Author(s) -
Baessler H.,
Riehl N.,
Vaubel G.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680260225
Subject(s) - electron , quasi fermi level , anthracene , saturation (graph theory) , band gap , condensed matter physics , conduction band , electronic band structure , angle resolved photoemission spectroscopy , atomic physics , thermal conduction , crystal (programming language) , inverse photoemission spectroscopy , fermi level , semimetal , chemistry , electronic structure , physics , quantum mechanics , mathematics , organic chemistry , combinatorics , computer science , programming language
The spectral dependence of the photoemission of electrons from a metal into a narrow conduction band of a crystal is calculated qualitatively. It is shown that the Fowler relation j ph ∼ ( h v –χ) 2 holds for χ ≦ h v ≦ χ + δ where χ denotes the energy difference between the Fermi level of the metal and the bottom of the conduction band and δ the band width. For h v ≧ χ + δ the current approaches a saturation value. The model is applied to the description of the photoemission of electrons from a Na and a Ca cathode into the first and the second conduction band of an anthracene crystal. The width of the second band is found to be (0.5 ± 0.1) eV. The energy gap between the top of this band and the next higher (third) conducting state is at least 0.6 eV.