Line shapes of narrow optical bands: Infrared absorption by U centers and heavier impurities in alkali halides

Lagos, M; Asenjo, F.; Hauyon, R; Pasten, D; GONZALEZ, H; Henríquez R.; Troncoso R.

Abstract

The shape of the bands for photon absorption and emission by the local constituents of a solid is governed mainly by processes involving many low-energy acoustic phonons. This applies not only to wide bands, such as those exhibited by F centers, but also to narrow ones, as those observed for infrared absorption by local vibration modes of U centers and heavier impurities. The line shapes are theoretically studied on a general basis to show they provide a nice example to illustrate the power of field theory and methods to reproduce experimental facts. To this aim, the phonon induced broadenings of infrared absorption lines by U centers in KCl and KBr, and by substitutional Ag+ in KI, were calculated to compare theoretical predictions with experiment. The agreement obtained between both is remarkable. © 2008 The American Physical Society.

Más información

Título según WOS: Line shapes of narrow optical bands: Infrared absorption by U centers and heavier impurities in alkali halides
Título según SCOPUS: Line shapes of narrow optical bands: Infrared absorption by U centers and heavier impurities in alkali halides
Título de la Revista: PHYSICAL REVIEW B
Volumen: 77
Número: 10
Editorial: American Physical Society
Fecha de publicación: 2008
Idioma: English
URL: http://link.aps.org/doi/10.1103/PhysRevB.77.104305
DOI:

10.1103/PhysRevB.77.104305

Notas: ISI, SCOPUS