# THE D-X BAND SYSTEM OF CaH

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 Title: THE D-X BAND SYSTEM OF CaH Creators: Bell, G. D.; Herman, M.; Johns, J. W. C.; Peck, E. R. Issue Date: 1978 Publisher: Ohio State University Abstract: A many lined spectrum which can be attributed to hitherto unknown bands of the $D^{2}\Sigma^{+} -X^{2}\Sigma^{+}$ system of $CaH,^{1}$ has been observed in absorption using a King furnace, The spectra were obtained under conditions of high resolution with a 10 m grating spectrograph. Analysis shows that the levels of $D^{2}\Sigma^{+}$ are all strongly perturbed. We present a theoretical model which takes account of the close lying $B^{2}\Sigma^{+}$ and $E^{2}\pi$ states and which gives a qualitative explanation of the observed perturbations. An important feature of the interpretation is that the accepted vibrational frequency of $D^{2}\Sigma^{+}$ must be reduced by a factor of 2. Description: $^{1}$B. Grundstr\""{o}m, Z. Physik 75, 302 (1932)."" Author Institution: Herzberg Institute of Astrophysics, National Research Council of Canada URI: http://hdl.handle.net/1811/10415 Other Identifiers: 1978-MF-07