Detection of oxygen atoms in a high pressure surfatron microwave discharge via two-photon four-wave mixing

被引:1
作者
Konz, E
Grzeszik, R
Marowsky, G
Akimov, V
Rusin, L
Rubahn, HG
机构
[1] MAX PLANCK INST STROMUNGSFORSCH,D-37073 GOTTINGEN,GERMANY
[2] RUSSIAN ACAD SCI,INST ENERGY PROBLEMS CHEM PHYS,MOSCOW 117829,RUSSIA
来源
APPLIED PHYSICS B-LASERS AND OPTICS | 1997年 / 64卷 / 05期
关键词
D O I
10.1007/s003400050223
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Ground state (P-3(J)) oxygen atoms are detected in a high pressure surface wave discharge driven at 2.45 GHz via two-photon resonant degenerate four-wave mixing spectroscopy (TP-DFWM) in the forward folded BOX configuration. The nonlinear optical signal provides a direct measure of the relative oxygen atom concentration with high spatial resolution inside the discharge up to pressures of 1 bar and without distortions due to linear absorption or saturation effects. The axial distribution of oxygen atom concentration is observed to depend sensitively on total pressure and gas flux. For total gas pressures up to 600 mbar both in case of a mixture of 10% O-2/He and 10% O-2/Ar the concentration of oxygen atoms increases linearly with pressure. At higher pressures an increase with larger slope is observed for 10% O-2/Ar, while the concentration remains constant for 10% O-2/He. This is interpreted by an increase of the three-body recombination rate in O-2/He mixtures.
引用
收藏
页码:613 / 618
页数:6
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