ELECTRIC-FIELD EFFECTS IN THE NEAR-THRESHOLD PHOTOIONIZATION SPECTRUM OF NITRIC-OXIDE

被引：109

作者：

PRATT, ST

机构：

[1] Argonne National Laboratory, Argonne

来源：

JOURNAL OF CHEMICAL PHYSICS | 1993年 / 98卷 / 12期

关键词：

D O I：

10.1063/1.464404

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Zero-kinetic-energy-photoelectron spectroscopy (ZEKE-PES) and time-of-flight mass spectrometry are used to investigate the near-threshold, two-color photoionization of NO via the A 2SIGMA+, v = 0 level. Pulsed-field ionization of Rydberg states within 20 cm-1 of the ionization threshold is shown to proceed via a diabatic mechanism. Particular emphasis is given to the effect of predissociation on the signal produced by delayed field ionization. A small (approximately 3 V/cm) dc electric field is shown to produce a dramatic decrease in the field ionization signal in both the NO+-ion and ZEKE-electron channels. This decrease is thought to be due to an increase in the predissociation rate caused by the dc electric field. The implications of these experiments for mass-analyzed threshold ionization are discussed.

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页码：9241 / 9250

页数：10

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