Temporal and spatial distribution profiles of lithium atoms in low-pressure discharges by concentration-modulated absorption spectroscopy

Richard M. Allott, Miklos Kubinyl, A. Grofcsik, W. Jeremy Jones, Rod S. Mason

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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 × 1011 cm-3 in the centre at 14 mA) and a plane-parallel dc discharge (1.24 × 109 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, P1/2, 3/2 resonance transition in lithium (σ ≈ 2.95 × 10-12 cm2) 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 dc 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, P1/2, 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).

Original languageEnglish
Pages (from-to)1297-1301
Number of pages5
JournalJournal of the Chemical Society - Faraday Transactions
Volume91
Issue number9
DOIs
Publication statusPublished - 1995

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temporal distribution
Glow discharges
Absorption spectroscopy
Lithium
Spatial distribution
absorption spectroscopy
spatial distribution
Cathodes
low pressure
lithium
glow discharges
Electric lamps
Atoms
hollow cathodes
profiles
Pumps
luminaires
atoms
pumps
probes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Temporal and spatial distribution profiles of lithium atoms in low-pressure discharges by concentration-modulated absorption spectroscopy. / Allott, Richard M.; Kubinyl, Miklos; Grofcsik, A.; Jones, W. Jeremy; Mason, Rod S.

In: Journal of the Chemical Society - Faraday Transactions, Vol. 91, No. 9, 1995, p. 1297-1301.

Research output: Contribution to journalArticle

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