Abstract
The transition operator accounting for changes of the Zeeman sublevels of a1 P-state or closely spaced2 P-states has been derived using the classical-path approximation. In a first order approach to the problem thep-state atom is assumed to enter the range of a foreign atom non-adiabatically fast until reaching the point of the closest distance. There it is assumed to stop for the entire collision time. During this time the molecular σ and π states suffer phase-shifts due to the interaction with the molecular electric field. Subsequently thep-state atom leaves the range of the foreign atom again non-adiabatically fast. TheT-operator hence derived gives rise to the so-calledm j-selection rule. In a better approach thep-state atom is assumed to stop twice when passing the range of the foreign atom. From this approximation additional terms to theT-operator arise which characteristically account for ‘molecular coupling’ phenomena during the collision. Consequently, these terms violate the afore-mentionedm j-selection rule.
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The author acknowledges fruitful discussions with Dr. G. Grawert and Dr. W. Schneider, both at Marburg University.
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Elbel, M. The transition operator for depolarizing collisions. Z. Physik 248, 375–386 (1971). https://doi.org/10.1007/BF01395689
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DOI: https://doi.org/10.1007/BF01395689