CN B yields X Emission in Electron-Stimulated Desorption from Alkali Halides:Population Analysis via Nonlinear Models

摘要

Excitation of crystalline KBr, KCl, and LiF with electrons of energy 60-1000 eVproduces weak emission in the 360-420 nm region. The emission is attributed to CN molecules that leave the surface of the crystal in their electronically excited state. The resulting spectra, which are rotationally unresolved, are analyzed by novel nonlinear fitting procedures to yield information about the vibrational and rotational population distributions. For CN(B) produced via electron-stimulated desorption from LiF, the vibrational populations approximate a temperature of 1500K, while the rotational abundances can be represented as a sum of two Boltzmann distribution is adequately represented as a sum of two Boltzmann distributions having temperatures of 660 K (81%) and 90 K (19%).