J. Phys. II France
Volume 2, Numéro 4, April 1992
Page(s) 773 - 779
DOI: 10.1051/jp2:1992165
J. Phys. II France 2 (1992) 773-779

Radiative-lifetime and Landé-factor measurements of the Se I 4p 35s 5S 2 level using pulsed laser spectroscopy

G. J. Bengtsson, U. Berzinsh, J. Larsson, S. Svanberg and R. Zerne

Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden

(Received 21 October 1991, accepted 30 January 1992)

First laser spectroscopic investigations on atomic selenium are reported. Natural selenium was thermally dissociated in a quartz resonance cell keeping the background pressure of abundant selenium molecules low by differential heating. The 4p 35s 5S 2 level was excited by frequency-tripled pulsed-dye laser radiation at 207 nm. From time-resolved recordings of the fluorescence decay at 216 nm a natural radiative lifetime of 493(15) ns was determined, while quantum-beat and optical double-resonance measurements in an external magnetic field yielded $g_{\rm J}=2.0004(10)$ for the Landé factor. The results are compared with previous theoretical and experimental data.

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