HIGH RESOLUTION SPECTRUM OF THE 1.53 $\mu m$ BAND OF THE $B' {^{3}\Sigma}_{u}^{-} \rightarrow B 3^\Pi_{g}$ SYSTEM OF $N_{2}$
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Date
1977
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Publisher
Ohio State University
Abstract
The 0-0 band of the $B^{\prime} {^{3}\Sigma}_{u}^{-} \rightarrow B 3^\Pi_{g}$ system of molecular nitrogen at 1.53 $\mu m$ has been recorded at a resolution of $0.046 cm^{-1}$ and a precision of $0.007 cm^{-1}$. Although this band system was characterized by early investigators as the Nitrogen Infrared Afterglow System, the 0-0 band, in particular, appears in D.C. glow discharges with an intensity comparable with that of neighboring bands of the First Positive System. Accordingly, it is a prime candidate as an auroral feature, although no band of the B^{\prime} -B has yet been observed in auroral displays. The spectrum was obtained with a 5-meter Jarrell-Ash Czerny-Turner spectrograph adapted to spectrometric operation in the 1 to 2 $\mu m$ wavelength region. The grating is a 10-inch 300 line per mm echelle used in the third order, A lead screw assembly with a stepping motor drive has been installed to translate an exit slit which is focused onto a cooled intrinsic germanium detector. The reciprocal dispersion at the 75 micron scanning exit slit is 1.44 $\AA$ per mm. The result has been the production of very reproducible high resolution spectra. The band has been recorded through a lock-in amplifier onto both magnetic tape and a strip chart recorder with higher order lines of iron and neon as standard wavelengths. A rotational analysis for the 27 branches of the band has been carried out on the basis of 482 identified lines.
Description
This research was supported, in part, by the Atmospheric Sciences Section, NSF.
Author Institution: Institute for Molecular Physics, University of Maryland; Institute for Molecular Physics, The Johns Hopkins University
Author Institution: Institute for Molecular Physics, University of Maryland; Institute for Molecular Physics, The Johns Hopkins University