Valence excitons from the 3p shell and core excitons from the 3s and 2p shells in gaseous and solid argon are studied within the envelope-function formalism. First, semiempirical model potentials for atomic excitons are considered; then solid-state effects, which include band structure and electron-hole screening, are taken into account. The problem of a sufficiently accurate account of the "band kinetic operator" is solved with first-order perturbation theory. A new interpretation of the excitonic spectrum originating from the 2p shell is given in terms of first-class exciton (1s) and third-class excitons (nd, n>=3) associated with a unique band edge.
Valence excitons and inner-shell excitons in gaseous and solid argon
GROSSO, GIUSEPPE;MARTINELLI, LIANA;
1979-01-01
Abstract
Valence excitons from the 3p shell and core excitons from the 3s and 2p shells in gaseous and solid argon are studied within the envelope-function formalism. First, semiempirical model potentials for atomic excitons are considered; then solid-state effects, which include band structure and electron-hole screening, are taken into account. The problem of a sufficiently accurate account of the "band kinetic operator" is solved with first-order perturbation theory. A new interpretation of the excitonic spectrum originating from the 2p shell is given in terms of first-class exciton (1s) and third-class excitons (nd, n>=3) associated with a unique band edge.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
