The Transient Absorption Due to Self-Trapped Excitons Localized at Iodine Dimers in Alkali Halide Crystals

Shoichi Hirota, Keiichi Edamatsu, Yasuhiro Kondo, Masamitsu Hirai

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The transient absorption spectra of a self-trapped exciton (STE) localized at iodine dimers [formula omitted] in iodine-doped alkali chloride and bromide crystals (AX:I; A=Na, K, Rb; X-CI, Br) have been investigated. The absorption bands due to electron-transitions appear below 1 eV, and the bands due to hole-transitions around 1.5 and 3.0 eV. The absorption bands due to the electron-transitions are located in much lower energy region than those of intrinsic STEs in nominally pure alkali chloride or bromide crystals. The bands due to the hole-transitions are very similar to those of Vk [formula omitted] centers in alkali iodide crystals. These results suggest that the STE localized at iodine dimers is in the "on-center'' configuration and its electronic state is diffused in comparison with that of "off-center" type STE.

Original languageEnglish
Pages (from-to)2774-2779
Number of pages6
Journaljournal of the physical society of japan
Volume63
Issue number7
DOIs
Publication statusPublished - 1994 Jan 1

Keywords

  • alkali halide crystals
  • iodine dimer
  • self-trapped exciton
  • transient absorption

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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