A projector formulation for the Van Vleck transformation
作者:
Flemming Jørgensen,
Thorvald Pedersen,
期刊:
Molecular Physics
(Taylor Available online 1974)
卷期:
Volume 27,
issue 1
页码: 33-47
ISSN:0026-8976
年代: 1974
DOI:10.1080/00268977400100041
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A formulation in terms of projection operators of the Van Vleck trans-formation is presented. Explicit formulae through eighth order are given, and the eleventh order may be reached fairly simply. Such high orders are relevant for the Born-Oppenheimer separation. It is proved that the Van Vleck transformation conserves symmetry. A special formulation is given for product spaces. The Foldy-Wouthuysen transformation is treated as an example.
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