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- W3136017239 abstract "The ground and lowest excited states of a rare gascrystal are treated in the tight-binding approximation. Frenkelexciton states constructed from symmetrically-orthogonalized statesof localized excitation are used and intermediate coupling ofsinglet and triplet states is carried out in order to includeatomic spin-orbit interaction. Expressions for energies, effectivemasses, and integrated absorption cross sections associated withthe lowest optically interesting states are obtained in anapproximation which considers overlapping of atomic wave functionsthrough terms of order S² and which neglects perturbations bysingle exciton states other than the twelve belonging to the lowestconfiguration. Lattice vibrations are not explicitly taken intoaccount. The formalism is applied to solid argon using atomicHartree-Fock wave functions. Exciton bands built from certainatomic J=2 states are found to have appreciable perturbing effectson the optically interesting bands, and certain interaction termswhich depend explicitly on overlap integrals are found to bedecisive in determining the sign of the exciton effective masses.The model predicts two absorption lines in the vicinity of 9 ev(±1 ev) with a separation of 0.2 ev and a combined integratedabsorption cross section of the order of 10⁶ ev cm⁻¹. The estimatedcomputational error in excitation energy arises in part fromdifficulties in evaluating two- and three-center integrals in thepresence of large overlap and in part from the natural inaccuracyof the atomic Hartree-Fock functions. Exciton effective masses arerelatively insensitive to the direction of k andare of the order of 5 electron masses." @default.
- W3136017239 created "2021-03-29" @default.
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- W3136017239 date "1958-01-01" @default.
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- W3136017239 title "Exciton states in solid argon" @default.
- W3136017239 hasPublicationYear "1958" @default.
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