Abstract
The effect of the so-called change of picture for operators in approximate relativistic theories on the second-order properties arising from some external perturbation, is considered. By means of the direct perturbation theory the general formula for the lowest-order relativistic correction to second-order properties is derived. The term which arises from the change of picture for the external perturbation operator is identified and evaluated for dipole and quadrupole polarizabilities. For the 1s 1/2 state of the hydrogen-like ions this term is found to bring about 16% and 7% of the total lowest-order irelativistic correction to the dipole and quadrupole polarizabilities, respectively. This finding is discussed in terms of its importance for long range interactions between heavy systems.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
