Luminescent reactive collisions between excited Ca atoms and HCl, Cl2

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Abstract
An atomic beam of Ca which contained atoms in metastable states 4s4p 3P2,1,0 and 4s3d 1D2 was passed into a scattering cell with HCl molecules or, alternatively, with Cl2. The A-X and B-X bands of CaCl were observed when the metastable states of Ca were populated. The shape of the A-X band indicates a population inversion within the vibrational levels of the A 2 Pi states, whereas no inversion is obtained in the B-X band. From the observed spectra, a lower limit of the dissociation energy of CaCl has been derived: D00>or=98.8 kcal mole-1( Delta D00=-2.1 kcal mole-1). Improved spectroscopic constants for the A and B states are given. The kinetics of the above reactions are discussed and a simple model is proposed to explain the different population distributions in the A and B states.