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Astron. Astrophys. 328, 752-755

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Branching ratio for the $^{\rm\bf 5}S_{\rm \bf 2}^{\rm \bf o}$ - $^{\rm \bf 3}P_{\rm\bf 2,1}$ inter-system resonance multiplet in P II

J.J. Curry and J.E. Lawler

Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706, USA

Received 20 June 1997 / Accepted 1 August 1997


The P II inter-system multiplet, $3s3p^3\ ^5S_2^o\ -\ 3s^23p^2\ ^3P_{2,1}$ at $\lambda_{air} = 221.033$nm and 219.556nm, have been observed in emission from a low-pressure inductively-coupled plasma source. The measured branching ratio, $A_{2210}/A_{2196} =3.04\pm 0.15$, is in agreement with recent ab initio calculations. Absolute transition probabilities, $A_{2210}=4500\pm 330$ s-1 and $A_{2196}=1480\pm 120$ s-1, are determined by combining the measured branching ratio with the previously measured lifetime of the 5S2o metastable level.

Key words: atomic data - methods: laboratory

Send offprint requests to: curry@tristan.physics.wisc.edu

© European Southern Observatory (ESO) 1997

Online publication: November 24, 1997
Last change: March 26, 1998