THE SLIGHTLY ASYMMETRIC ROTATOR. PERTURBATION THEORY BY CONTACT TRANSFORMATION

$^{1}$R. H. Schwendeman, J. Chem. Phys. 27, 986 (1957).Author Institution: Randall Laboratory of Physics, University of Michigan“Perturbation calculations involving vibration-rotation interactions are usually simplified by subjecting the Hamiltonian to a contact transformation, $H’=THT^{-1}$, with $T = \exp(i\lambda S)$. The same technique may be useful in may be useful in many simpler problems. As a detailed example an S function is exhibited for the slightly asymmetric rotator, and analytical expressions are given for energy coefficients of the type tabulated by $Schwendeman.^{1}$