TEMPORAL AND SPATIAL-DISTRIBUTION PROFILES OF LITHIUM ATOMS IN LOW-PRESSURE DISCHARGES BY CONCENTRATION-MODULATED ABSORPTION-SPECTROSCOPY

被引:7
作者
ALLOTT, RM
KUBINYL, M
GROFCSIK, A
JONES, WJ
MASON, RS
机构
[1] UNIV COLL SWANSEA,DEPT CHEM,SWANSEA SA2 8PP,W GLAM,WALES
[2] TECH UNIV BUDAPEST,DEPT CHEM PHYS,H-1521 BUDAPEST,HUNGARY
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1995年 / 91卷 / 09期
关键词
D O I
10.1039/ft9959101297
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The application of the new pump-probe spectroscopic technique, COMAS (concentration-modulated absorption spectroscopy), to the study of sputtered lithium atoms in two glow-discharge devices is discussed. Information is presented on the absolute concentration of lithium atoms in a hollow cathode lamp (1.62 x 10(11) cm(-3) in the centre at 14 mA) and a plane-parallel de discharge (1.24 x 10(9) cm(-3) close to the cathode at 1.05 mA). In addition an experimentally derived absorption cross-section for the (2s)(2), S --> (2p)(2), P-1/2,P-3/2 resonance transition in lithium (a x 2.95 x 10(-12) cm(2)) is presented for the first time. In producing concentration profiles for both a commercial hollow cathode lamp and a glow-discharge system built in-house, use is made of the high spatial resolution attainable with COMAS. Results obtained in the de plane-parallel system are compared to a theoretical model describing the transport of sputtered atoms through a low-pressure glow discharge. By varying the delay between the pump and probe laser pulses, the lifetime of the (2p)(2), P-1/2,P-3/2 state has been measured as 25 +/- 1 ns showing good agreement with values obtained by other methods found in the literature (ca. 24-27 ns).
引用
收藏
页码:1297 / 1301
页数:5
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