FIZIKA B 4 (1995) 3, 259-272

TIME DEPENDENT PERTURBATION THEORY AND THE ZEL'DOVICH ELECTRIC DIPOLE MOMENT IN ATOMS

DUBRAVKO TADIƹ, DENNIS E. KRAUSE², EPHRAIM FISCHBACH² AND DANIEL SUDARSKY^3
1Physics Department, Faculty of Science, University of Zagreb, Zagreb, Croatia
²Physics Department, Purdue University, West Lafayette, IN 47907-1396, U.S.A.
³Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, México D. F. 04510, Mexico

Dedicated to Professor Mladen Paiæ on the occasion of his 90^th birthday

Received 6 July 1995

We use time dependent perturbation theory to investigate the Zel'dovich electric dipole moment. We show that the vanishing Stark shift and non-vanishing torque arise from different time dependences used in their calculation.

UDC 530.145
PACS 13.40.Em

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