Selection rules for collisional energy transfer in homonuclear diatomics elastic collisions and the influence of nuclear spin

✍ Scribed by S.R. Jeyes; A.J. McCaffery; M.D. Rowe; P.A. Madden; H. Katô

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 401 KB
• Volume: 47
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(77)85038-0

✦ Synopsis

Quantitative study of the circular polarisation of resonance fluorescence doublets in molecular iodine as a function of rotational quantum number permits the formulation of a selection rule on the space-fixed rotational projection quantum number. This rule states that for elastic collisions of homonuclear diatomic molecules, changes in M as a result of the collision are forbidden. Essential to the elucidation of this rule is the realisation of the influence of nuclear spin on the polarisation ratios and when this effec~ is considered, there is no part of the depolarisation which may be attributed to collisional interactions.