Lambdadoubling in the C^{1}Π _{u} state of H _{2}
Abstract
The Λdoubling of the H_{2}C^{1}Π _{u} state rovibronic energy levels by interaction with the B ^{1}Σ_{u}^{+} state is calculated. The present calculation seeks to improve on the similar work of Julienne ( 1) in three respects (1) The pure precession approximation is not made. (2) Stwalley's Bstate potential curve ( 8) is used and the B and Cstate zeroorder eigenvalues are more accurately positioned. (3) The effect of the Bstate vibrational continuum is included. The Λdoubling values agree with experiment to within 1.0 cm ^{1} for J = 1, 2, and 3, and to within 1.5 cm ^{1} for J = 4 and 5. It is shown that the Λdoubling coupling matrix elements provide a sensitive test of electronic potential energy curves. In particular, the inaccuracy of the left limb of the Bstate RKR curve is demonstrated.
 Publication:

Journal of Molecular Spectroscopy
 Pub Date:
 December 1974
 DOI:
 10.1016/00222852(74)900721
 Bibcode:
 1974JMoSp..53..364F