Fine-Structure Branching in N 2 C 4 1 Sigma + U (0)

Details Fine-Structure Branching in N 2 C 4 1 Sigma + U (0) Fine-Structure Branching in N 2 C 4 1 Sigma + U (0)

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452..480s&link_type=abstract

Astrophysical Journal v.452, p.480

Astronomy and Astrophysics

Astronomy

20

Methods: Laboratory, Molecular Data, Molecular Processes, Ultraviolet: General

Scientific paper

We report a quantitative measurement of the predissociation fraction in the N2c'41Σ+u-X1Σ+g (0, 0) band, with an experimental determination of rotational line strengths. The fine structure of the N2(c'4-X) (0, 0) band has been analyzed in optically thin laboratory emission spectra obtained from crossed electron and N2 beams. The distortion of the emission envelope from calculations based on constant rotational level radiative transition probabilities and a thermalized ground state source population has been used to obtain an estimated predissociation loss fraction of 0.15 + -0.045+0.01 for the N2 c'4 (0) level averaged over rotational structure at a neutral gas temperature of 300 K. The analysis has been aided by measurements at gas temperatures depressed over a range from 300 to 30 K. The predissociation rate is temperature dependent, caused by nonuniform predissociation at intermediate and high rotational levels. The coupling of the rotational branches, also measured quantitatively for N2 c'4 (0) for the first time in this experiment, is complicated by configuration mixing with the c3 1Πu and b1Πu states forcing strong departures from Hönl-London factors.

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