INFRARED SPECTROSCOPY WITH AN OPTICAL PARAMETRIC OSCILLATOR: THE SHIFT AND STRENGTH OF THE $S_{2}$(1) HYDROGEN LINE
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Date
1975
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Ohio State University
Abstract
A tunable laser was used in combination with a 25-m base-path White cell and a 5-m spectrometer to obtain measurements of the equivalent width and frequency of the $S_{2}$(l) line of hydrogen over the density range of one to four amagat. The long optical path permits ratioing (I/I$^{\circ}$) to be done with a single detector. The equivalent widths analyzed in terms of a Galatry line shape yield a line strength in excellent agreement with the ab initio calculations. The pressure shift of the $S_{2}$(l) frequency is approximately twice that measured for the $S_{1}$(l) line. This result indicates a perturbation of the vibrational force constant and is consistent with results obtained with hydrogen $deuteride.^{1,2}$
Description
$^{1}$A.R.W. McKellar, Ap. J. 185, L53 (1973). $^{2}$A.R.W. McKellar. Can. J. Phys. 51, 389 (1973).""
Author Institution: Ames Research Center
Author Institution: Ames Research Center