Photon-stimulated ejection of atoms from alkali-halide nanocrystals

Xiuling Li, Rainer D. Beck, Robert L. Whetten

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Interband excitation of single alkali-halide nanocrystals in the form of mass-selected Mn1Xn beams (M=K, Cs and X=Br I) by ultraviolet radiation leads exclusively to halogen-atom emission with very large cross section. The final state is a midgap (F-center) state. A pathway consisting of direct ejection of a photoneutralized surface atom is derived from a band picture using the computed energetics of the (3,3,3) nanocrystal M14X13+. This mechanism is contrasted with photon-stimulated desorption from crystal surfaces, and related to formation of surface defect states and metallized overlayers.

Original languageEnglish (US)
Pages (from-to)3420-3423
Number of pages4
JournalPhysical Review Letters
Volume68
Issue number23
DOIs
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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