Higher order molecular spectroscopic constants and dipole moment derivatives for diatomic alkali halides

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Abstract
Higher order molecular spectroscopic constants γe and βe are calculated for diatomic alkali halide molecules using new polarizabilities derived recently from the Seitz–Ruffa (SR) energy level analysis. The results for 20 alkali halide diatomic molecules are obtained using the Rittner potential and three forms of repulsion, viz. the Born–Mayer repulsion, the Hellmann repulsion, and the Born–Lande repulsion form. The dependence of the dipole moment on the vibrational quantum number is studied by evaluating the first and higher order derivatives of dipole moment using the SR energy level analysis. The results obtained are discussed and compared with the available experimental data as well as with quantum-mechanical results obtained by Matcha.
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