Evidence for a surface exciton in KBr via laser desorption

被引：28

作者：

Beck, KM ^{[1
]}

Joly, AG ^{[1
]}

Hess, WP ^{[1
]}

机构：

[1] Pacific NW Natl Lab, William R Wiley Environm Mol Sci Lab, Richland, WA 99352 USA

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.63.125423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate that direct photoexcitation of the single crystal KBr surface leads to desorption of hyperthermal neutral bromine atoms. We have produced separately the hyperthermal and the near-thermal components of neutral halogen emission from an alkali halide. The source of hyperthermal bromine emission is attributed to decay of a surface exciton excited at photon energies below that of the bulk exciton. We argue that the frequently observed near-thermal component is derived from excitation within the bulk crystal. Our experimental data provide strong support to a theoretical excitonic emission model previously described in the literature.

引用

页数：6

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