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M. D. SAKSENA, SUNANDA. KUMAR, Spectroscopy Division, Modular Laboratories, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085; M. N. DEO, Synchrotron Radiation Section, Modular Laboratories, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085; S. H. BEHERE, Prof., Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431 004; ASHOK. JADHAV, Lecturer, New Arts, Commerce and Science College, Ahmednagar 414 001. INDIA.
The A 2
r - X 2
+ 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 MgCl2 and Ar. The resulting spectra are very intense and 0-0, 1-1 and 1-0 bands of A 2
1/2 - X 2
+ sub-transition and 0-0 band of A 2
3/2 - X 2
+ sub-transition have been recorded and rotationally analyzed. Molecular constants have been derived using a least-squares fit programme in which optical dataa of 0-1 and 0-2 bands (A 2
1/2 - X 2
+ ) was also included. The
-doubling constants in the v = 0, 1 levels of the sub-state A 2
1/2 are as expected, i.e. p1 > p0, 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.,
0 >
1 >
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.
aM. Singh, G. S. Ghodgaonkar, and M. D. Saksena, Can. J. Phys. 65, 1594 (1987).