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Excitons in Pure and Doped Solid Neon
Author(s) -
Pudewill D.,
Himpsel F.J.,
Saile V.,
Schwentner N.,
Skibowski M.,
Koch E. E.
Publication year - 1976
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.2220740209
Subject(s) - neon , atomic physics , exciton , impurity , binding energy , oscillator strength , doping , band gap , vacuum ultraviolet , synchrotron radiation , physics , condensed matter physics , optics , argon , spectral line , quantum mechanics
A detailed investigation of the optical excitations of pure solid Ne and of Xe, Kr, and Ar impurities in Ne has been carried out in the vacuum ultraviolet using synchrotron radiation. For pure solid Ne the optical constants ϵ 1 (ω) and ϵ 2 (ω) are derived via a Kramers‐Kronig analysis. For the guest atoms the energy levels within the band gap are determined. A new value of 21.69eV is established for the gap energy of pure Ne. The binding energies for the impurity excitations are the same as those for pure Ne for n ≧ 2. The Wannier model provides a satisfactory description. There is no linear dependence of the central cell correction ΔE c on the binding energies B 1 as previously claimed. Estimates for the oscillator strength of the excitons in pure Ne (both spin components included) gave f ( n = 1) = 0.22, f ( n = 2) ≈ 0.042, and f ( n n = 3)≈ 0.016 by comparing the experimental results with model calculations.