Time resolved study of CN band emission from plasma generated by laser irradiation of graphite

被引：47

作者：

Harilal, SS ^{[1
]}

Issac, RC ^{[1
]}

Bindhu, CV ^{[1
]}

Gopinath, P ^{[1
]}

Nampoori, VPN ^{[1
]}

Vallabhan, CPG ^{[1
]}

机构：

[1] COCHIN UNIV SCI & TECHNOL,INT SCH PHOTON,LASER DIV,COCHIN 682022,KERALA,INDIA

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 1997年 / 53卷 / 10期

关键词：

laser ablation; graphite plasma; CN bands; emission spectroscopy;

D O I：

10.1016/S1386-1425(97)00062-0

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Time and space resolved studies of emission from CN molecules have been carried out in the plasma produced from graphite target by 1.06 mu m pulses from a Q-switched Nd:YAG laser. Depending on the laser pulse energy, time of observation and position of the sampled volume of the plasma, the features of the emission spectrum are found to change drastically. The vibrational temperature and population distribution in the different vibrational levels have been studied as functions of distance, time, laser energy and ambient gas pressure. Evidence for nonlinear effects of the plasma medium such as self focusing which exhibits threshold-like behaviour are also obtained. Temperature and electron density of the plasma have been evaluated using the relative line intensities of successive ionization stages of carbon atom. These electron density measurements are verified by using Stark broadening method. (C) 1997 Elsevier Science B.V.

引用

页码：1527 / 1536

页数：10

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