THE $A^{6}\Sigma^{+} - X^{6}\Sigma^{+}$ TRANSITION OF CrH, EINSTEIN COEFFICIENTS AND AN IMPROVED DESCRIPTION OF THE A STATE
Loading...
Date
2001
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The spectrum of CrH has been reinvestigated in the $9000-15000 cm^{-1}$ region using the Fourier transform spectrometer of the National Solar Observatory. The 1-0 and 1-1 bands of the $A^{6}\Sigma^{+} - X^{6}\Sigma^{+}$ transition have been measured and improved spectroscopic constants have been determined. A value for the 2-0 band origin has been obtained from the band head using estimated spectroscopic constants. These data provide a set of improved equilibrium vibrational and rotational constants for the $A^{6}\Sigma^{+}$ state. An accurate description of the A-X transition has been obtained using a multireference configuration interaction approach. The inclusion of both scalar relativity and Cr 3s3p correlation are required to obtain a good description of both states. The ab initio computed Einstein coefficients and radiative lifetimes are reported.
Description
Author Institution: NASA Ames Research Center; Space Technology Division, University of Arizona; Department of Chemistry, University of Waterloo; Department of Chemistry, University of Dayton; Department of Physics, University of Dayton