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 language | English (US) |
|---|---|
| Pages (from-to) | 3420-3423 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 68 |
| Issue number | 23 |
| DOIs | |
| State | Published - 1992 |
| Externally published | Yes |
ASJC Scopus subject areas
- General Physics and Astronomy