Collect. Czech. Chem. Commun. 1993, 58, 1485-1490

Potential Energy Curve and Dissociation Energy for the SnCl Molecule

Narayanan Rajamanickama, Natarajan Ponraja, Ponpandian Durai Ezhilarasana, Veluchamy Arumugachamya, Manuel Fernandez Gomezb and Juan Jesus Lopez Gonzaleza

a Department of Physics, VHNSN College, Virudhunagar 626001, India
b Department of Physical Chemistry, Faculty of Experimental Sciences, University of Granada, 23071 Jaen, Spain


The potential energy curve for the electronic ground state of the SnCl molecule has been constructed by the Rydberg-Klein-Rees method in the modification by Vanderslice and collaborators. Empirical potential functions, of five parameters by Hulburt and Hirschfelder, of three parameters by Lippincott and collaborators, and that by Szoke and Baitz using the electronegativity are examined for their adequacy to represent the true curve. The five parameters by Hulburt-Hirschfelder function, U(r) = De[(1 - e-x)2 + c x3 e-2x (1 + bx)], was found to be the best fitting function and it was used for the determination of the dissociation energy. The estimated value attained for dissociation energy is 346 ± 8 kJ mol-1. For this value of dissociation energy, the estimated values for parameters and expansion coefficients are c = 0.06864, b = -0.363738, a0 = 2.759 . 103 m-1, a1 = 2.876 and a2 = 4.013, a0, a1 and a2, being the Dunham's coefficients.