Diode laser cavity-ringdown absorption spectroscopy for measuring N2(A3Σu+) density in plasmas

被引：6
|
作者：
Horikawa, Y. [1 ]
Kurihara, K. [2 ]
Sasaki, K. [3 ]
机构：
[1] Nagoya Univ, Dept Elect Engn & Comp Sci, Nagoya, Aichi 4648603, Japan
[2] Toshiba Co Ltd, Res & Dev Ctr, Yokohama, Kanagawa 2358522, Japan
[3] Nagoya Univ, Plasma Nanotechnol Res Ctr, Nagoya, Aichi 4648603, Japan
来源：
14TH INTERNATIONAL SYMPOSIUM ON LASER-AIDED PLASMA DIAGNOSTICS (LAPD14) | 2010年 / 227卷
关键词：
ABSOLUTE NUMBER DENSITIES; RF-PLASMA; DISCHARGE;
D O I：
10.1088/1742-6596/227/1/012012
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We developed a system of cavity-ringdown absorption spectroscopy employing a cw diode laser for measuring the absolute density of N-2(A(3)Sigma(+)(u)) in plasmas. We achieved a sensitive detection limit of 10(-7) for the absorbance. The saturation of absorption was avoided simply by switching off the laser beam when the cavity length was detuned slightly from the length corresponding to the perfect resonance. The absolute N-2(A(3)Sigma(+)(u)) density was deduced from the absorbance of the B-3 Pi(g)(v' = 2) - A(3)Sigma(+)(u) (v" = 0) band by comparing the absorption spectrum with spectral simulation, where we assumed the same values for the translational and rotational temperatures. Diode laser cavity-ringdown absorption spectroscopy for measuring N-2
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页数：4
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