A new method is presented for computation of diatomic rotational line strengths, or Hönl–London factors. The traditional approach includes separately calculating line positions and Hönl–London factors and assigning parity labels. The present approach shows that one merely computes the line strength for all possible term differences and discards those differences for which the strength vanishes. Numerical diagonalization of the upper and lower Hamiltonians is used, which directly obtains the line positions, Hönl–London factors, total parities, and e/f parities for both heteronuclear and homonuclear diatomic molecules. The fortran computer program discussed is also applicable for calculating n-photon diatomic spectra.
© 2005 Optical Society of America
Original Manuscript: September 1, 2004
Revised Manuscript: March 10, 2005
Manuscript Accepted: March 25, 2005
Published: June 20, 2005
James O. Hornkohl, Christian G. Parigger, and László Nemes, "Diatomic Hönl–London factor computer program," Appl. Opt. 44, 3686-3695 (2005)