The Vibration‐Rotation Energy Levels of Polyatomic Molecules III. Effect of Centrifugal Distortion

1937 ◽  
Vol 5 (8) ◽  
pp. 617-620 ◽  
Author(s):  
E. Bright Wilson
Keyword(s):  
Energy Levels ◽  
Polyatomic Molecules ◽  
Centrifugal Distortion ◽  
Vibration Rotation ◽  
Rotation Energy

Determinable parameters of the effective rotational Hamiltonians for excited vibrational states of semirigid symmetric top molecules of C4v, D4, D2h, andD2d symmetry

1989 ◽  
Vol 54 (12) ◽  
pp. 3107-3116
Author(s):  
Kamil Sarka ◽  
Dušan Papoušek
Keyword(s):  
Symmetry Axis ◽  
Energy Levels ◽  
Contact Transformation ◽  
Centrifugal Distortion ◽  
Vibrational States ◽  
Fourfold Symmetry ◽  
Vibration Rotation ◽  
Symmetric Top Molecules ◽  
Rotation Energy ◽  
General Method

A general method is described for obtaining the S functions which in the contact transformation of the vibration-rotation Hamiltonian of semirigid molecules with the fourfold symmetry axis eliminate the rotational and vibrational l-type operators and the Δk = ±4 centrifugal distortion operators from the λH1 terms of the expanded Hamiltonian. Explicit expressions are given for the vibration-rotation energy levels with independent effective spectroscopic parameters. Expressions are also given for the splittings of energy levels with essential resonances.

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