# HIGH-RESOLUTION F. T. SPECTRUM OF A - X BAND SYSTEM OF MgCl

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 Title: HIGH-RESOLUTION F. T. SPECTRUM OF A - X BAND SYSTEM OF MgCl Creators: Saksena, M. D.; Kumar, Sunanda; Deo, M. N.; Behere, S. H.; Jadhav, Ashok. Issue Date: 2004 Abstract: The $A^{2}\Pi_{r} - X^{2}\Sigma^{+}$ system of MgCl molecule (360-380 nm) has been recorded on BOMEM DA8 Fourier transform spectrometer at an apodized resolution of $0.035 cm^{-1}$. The spectra have been excited under flowing conditions in a demountable stainless steel hollow cathode lamp (400 V, 250 mA) containing anhydrous $MgCl_{2}$ and Ar. The resulting spectra are very intense and 0-0, 1-1 and 1-0 bands of $A^{2}\Pi_{1/2} - X^{2}\Sigma^{+}$ sub-transition and 0-0 band of $A^{2}\Pi_{3/2} - X^{2}\Sigma^{+}$ sub-transition have been recorded and rotationally analyzed. Molecular constants have been derived using a least-squares fit programme in which optical $data^{a}$ of 0-1 and 0-2 bands ($A^{2}\Pi_{1/2} - X^{2}\Sigma^{+}$) was also included. The $\Lambda$-doubling constants in the v = 0, 1 levels of the sub-state $A^{2}\Pi_{1/2}$ are as expected, i.e. $p_{1} > p_{0}$, whereas it is found that the spin-doubling constants of the v = 0, 1, 2 levels of the ground state decrease with the increase in v, i.e., $\gamma_{0} > \gamma_{1} > \gamma_{2}$. This is indicative of presence of some nearby state, influencing the spin-doubling in the ground state. The final results of the rotational analysis will be presented. URI: http://hdl.handle.net/1811/21133 Other Identifiers: 2004-FA-01