By transforming to new variables and carrying out a multipole expansion of the interaction Hamiltonian, we obtain expressions for the multipole moments of the molecule. The transition matrix elements are given.
1. Yu.S. Makushkin and O.N. Ulenikov, J. Mol. Spectrosc., 63, 1 (1977).
2. I.P. Akhmedov, Vestnik LGU, No. 10, 69 (1983).
3. A.A. Kiselev, Opt. Spectr., 51, 979 (1981).
4. I.P. Akhmedov, P.A. Brown and A.A. Kiselev, Vestnik LGU, No. 22, 74 (1981).
5. R.E. Moss and A.R. Perry, Mol. Phys., 23, 957 (1972).
6. B.J. Howard and R.E. Moss, Mol. Phys., 20, 147 (1971).
7. B.J. Howard and R.E. Moss, Mol. Phys., 19, 433 (1970).
8. J. Rychiewski, Mol. Phys., 49, 1443 (1983).
9. D.A. Varshalovich, A.N. Moskalev and V.K. Khersonskii, Quantum Theory of Angular Momenta (Nauka, Leningrad, 1975).
10. T.K. Rebane, Zh. Eksp. Teor. Fiz., 47, 1342 (1964).
11. F. Hund, Handbuch der Physik, 24, No. 1, 561 (1933).