# JET-COOLED SPECTROSCOPY OF THE A${}^6\Sigma^+$ $-$ X${}^6\Sigma^+$ SYSTEM OF CHROMIUM MONOHYDRIDE

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 Title: JET-COOLED SPECTROSCOPY OF THE A${}^6\Sigma^+$ $-$ X${}^6\Sigma^+$ SYSTEM OF CHROMIUM MONOHYDRIDE Creators: Chowdhury, Pradyot K.; Merer, A. J.; Rixon, Scott J. Issue Date: 2005 Abstract: Astrophysical interest in CrH has motivated several studies of its A${}^6\Sigma^+$ $-$ X${}^6\Sigma^+$ system}, 407$-$411 (2004) and references therein.}. In this work, pulsed laser-induced fluorescence spectra of the ($v^{\prime}$, 0) bands with $v^{\prime} =$ 1, 2 and 3 have been recorded under supersonic jet-cooled conditions following reaction of laser-ablated chromium atoms with methanol. Because of the large rotational constant and the jet-cooling, only lines with $N^{\prime \prime } \leq$ 5 are appreciably intense. Satellite branches with $\Delta N \neq \Delta J$, normally forbidden by Hund's case (b) selection rules, readily appear in all three bands as previously observed for the (0,0) band$^a$. Lines of the (2,0) and (3,0) bands are assigned here for the first time; strong perturbations considerably complicate the rotational structures of these bands. URI: http://hdl.handle.net/1811/30591 Other Identifiers: 2005-TG-12