Abstract
The lower rotational R and P branch lines of the N2+ first negative band, 0–0 vibrational transition, have been studied interferometrically. Spectral source temperatures less than 20 °K were obtained using a free-jet expansion. The first negative system was produced with a beam of 30 keV electrons and the spin doubling and spectral line shape of a given rotational line was observed with a Fabry–Perot interferometer. It was found that the values of the spin-doubling constants, as determined independently from R and P branch measurements, were not consistent, i.e., different values were obtained from the R and P branch data. This implies that the interpretation of the doublet splittings as spin doubling is incomplete. Furthermore, it was found that the measured linewidths indicated temperatures of about 70 °K greater than the actual gas temperature. These discrepancies are attributed to hyperfine structure.
© 1980 Optical Society of America
Full Article | PDF ArticleMore Like This
W. Benesch, D. Rivers, and J. Moore
J. Opt. Soc. Am. 70(7) 792-799 (1980)
Paul N. Stanton and Robert M. St. John
J. Opt. Soc. Am. 59(3) 252-260 (1969)
Terence L. Porter and Sumner P. Davis
J. Opt. Soc. Am. 53(3) 338-343 (1963)