# THE ELECTRONIC SPECTRUM OF AlCl

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 Title: THE ELECTRONIC SPECTRUM OF AlCl Creators: Contolini, R. J.; Mathews, C. W.; Miller, S.; Bickel, C. Issue Date: 1981 Publisher: Ohio State University Abstract: New data have been obtained on the electronic transitions of AlCl between 1600{\AA} and 4200{\AA} by both emission and absorption techniques. Studies of the $A^{1}\Pi-X^{1}\sum^{+}$ transition in absorption have yielded rotational structure for the 0-0 band and other low-lying levels, unlike previous studies of the emission spectrum which had resolvable rotational lines only for $v > 3$ in both states. The following constants (in $cm^{-1}$) were obtained for the 0-0 band after fixing the lower state constants to those obtained from the microwave $spectrum^{1}: \nu_{oo} = 38237.6, B_{o}^{\prime}= 0.24407$,and $D_{o}^{\prime} =2.99\times10^{-7}$ The transition occurring between 3900 {\AA} and 4200 {\AA}, previously assigned as the a $^{3}\Pi-X ~^{1}\Sigma^{+}$ $transition^{2}$, has been observed in emission with sufficient resolution to estimate the following constants (in $cm^{-1}$): $\nu_{oo} = 24614.3,~ \omega e = 527, \omega exe = 3.1, B_{o}^{\prime} = 0.2502,$ and $D_{o}^{\prime} = 1.56\times10^{-7}$. The vacuum ultraviolet spectrum of AlCl has been seen in emission and, for the first time in absorption from 1600 {\AA}-1870 {\AA}. Five vibrational progressions have been observed, three of which are consistent with a progression in the ground state. These system appear to be quite distinct from those reported previously between 1820 {\AA} and 2075 {\AA} by Reddy and $Rao^{3}$. Description: $^{1}$F. C. Wyse, W. Gordy. J. Chem. Phys. 56, 2130 (1972) $^{2}D$. Sharma, Astrophys. J. 113, 210 (1950) $^{3}S$. Paddi Reddy, P. Tiruvenganna Rao, Can. J. Phys. 35, 912 (1957) Author Institution: URI: http://hdl.handle.net/1811/11744 Other Identifiers: 1981-WG-1