Excited state dynamics of nitrogen reactive intermediates at the threshold of laser induced filamentation

被引：33

作者：

Arnold, Bradley R. ^{[1
,2
]}

Roberson, Stephen D. ^{[2
]}

Pellegrino, Paul M. ^{[2
]}

机构：

[1] Univ Maryland Baltimore Cty, Dept Chem & Biochem, Baltimore, MD 21250 USA

[2] USA, RDRL SEE O, Res Lab, Adelphi, MD 20783 USA

来源：

CHEMICAL PHYSICS | 2012年 / 405卷

关键词：

Filamentation; Nitrogen excited states; Time-resolved emission spectroscopy; Electron density; ELECTRIC-FIELD STRENGTH; INTENSITY RATIO; SPECTRAL BANDS; MOLECULAR NITROGEN; LIGHT FILAMENTS; PULSE; PLASMAS; AIR; SPECTROSCOPY; EMISSION;

D O I：

10.1016/j.chemphys.2012.05.019

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：

It has been suggested that the process of laser induced filamentation can be used in a wide range of applications such as: material processing, controlled electric discharge, and innovative spectroscopic measurements including the remote sensing of pollutants and hazardous materials. During filamentation, emissions from small excited molecular species and atomic states, both neutral and ionic, are readily observed. Among the important excited state species observed in air is the excited triplet state of molecular nitrogen, N-2(C-3 Pi(u)). A method used to measure the emission properties of the excited states of nitrogen during filamentation is described. These measurements indicate that intersystem crossing from an excited singlet state is the dominate path to produce the triplet state. Alternative pathways, including neutralization of cationic species, were shown to be minor contributors under the laser-induced filamentation conditions of this study. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：9 / 15

页数：7

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