Neutral and ionic emission in Q-switched Nd:YAG laser-induced shock wave plasma

被引：32

作者：

Budi, WS

Baskoro, WT

Pardede, M

Kurniawan, H

Tjia, MO

Kagawa, K

机构：

[1] Univ Indonesia, Appl Spectroscopy Lab, Grad Program Optoelectrotech & Laser Applicat, Jakarta 10430, Indonesia

[2] Bandung Inst Technol, Dept Phys, Fac Math & Nat Sci, Bandung, Indonesia

[3] Fukui Univ, Dept Phys, Fac Educ, Fukui 910, Japan

来源：

APPLIED SPECTROSCOPY | 1999年 / 53卷 / 11期

关键词：

shock excitation stage; cooling stage; ion production; shock-wave plasma; collision-induced excitation; signal-to-background ratio;

D O I：

10.1366/0003702991945957

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Excitation mechanisms for copper and zinc atoms as well as their ionic species in the Q-switched (Q-sw) Nd:YAG laser-induced shock wave plasma have been investigated with a time-gated optical multichannel analyzer (OMA) system for various experimental conditions. It is demonstrated that the shock excitation process is the main mechanism responsible for the emission spectra for laser energy ranging from 8 to 86 mJ and surrounding air pressure from 2 to 50 Torr, At air pressure below 2 Torr, collision-induced excitation appears to take over and becomes the operative mechanism. In all cases, the neutral emission dominates over the ionic emission, leading to a high signal-to-background ratio, which tends to decrease, however, at higher laser energy and air pressure.

引用

页码：1347 / 1351

页数：5

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