Measurement of rotational populations of CH radicals in low-temperature lasmas

被引：13
作者：
Kobayashi, H
Kado, S
Xiao, BJ
Tanaka, S
机构：
[1] Univ Tokyo, Grad Sch Engn, Dept Quantum Engn & Syst Sci, Bunkyo Ku, Tokyo 1138656, Japan
[2] Univ Tokyo, High Temp Plasma Ctr, Bunkyo Ku, Tokyo 1138656, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2003年 / 42卷 / 4A期
关键词：
methane; CH radical; charge exchange; dissociative recombination; rotational population; divertor simulator; MAP-II;
D O I：
10.1143/JJAP.42.1776
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Rotational population of CH radicals in A(2)Delta state was measured using a high resolution visible spectrometer in low-temperature helium plasmas with methane injection in materials and plasma (MAP)-II device. The rotational population in the A(2)Delta state is characterized by bi-Maxwellian distributions with different rotational temperatures, T-HOT and T-COLD. The rotational temperatures of both components decreased through collisions with background helium. The dependence of emission intensity on plasma parameters suggests that dissociative recombination of methane ions, which are ionized by charge exchange of methane with helium ions should be taken into account in the discussion of the dissociation processes in CH radicals in the pressure regime from 0.24 to 1.2 Pa in this experiment.
引用
收藏
页码：1776 / 1787
页数：12
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