# ON ATOM/DIATOM COLLISIONAL REORIENTATION BY POLARISED FLUORESCENCE

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 Title: ON ATOM/DIATOM COLLISIONAL REORIENTATION BY POLARISED FLUORESCENCE Creators: Ibbs, K. G.; McCaffery, A. J.; Rowe, M. D. Issue Date: 1979 Publisher: Ohio State University Abstract: A single mode circularly polarised dye laser is used to selectively excite individual vibronic states of several diatoms. The result is that the Mj state distribution of the excited molecules is asymmetric. The degree of polarisation of fluorescence is a measure of this orientation and easily predicted for collision free fluorescence. Results show the polarisation of resonance fluorescence to be virtually independent of pressure. The polarisation of rotational transferred fluorescence is a function of $\Delta$J, but for $\Delta J$ small compared with J the polarisation is again high.(1) This shows the Mj distribution is largely retained during elastic and inelastic collisions. Results are shown on high J lines in the $B^{3}\Sigma - X^{3}\Sigma$ spectrum of $Se_{2}$, and small J values on the $B^{1}\pi_{u} - X^{1}\Sigma_{g}$ spectrum of $Li_{2}$. The evidence lends support for Alexander’s l-dominant model of atom/diatom collisions. (2) Description: 1. S. Jeyes, A. McCaffery, M. Rowe, and H. Kato, Chem. Phys., Lett., 48, 91 (1977). 2. M. Alexander, J. Chem. Phys., 67, 2703 (1977). Author Institution: URI: http://hdl.handle.net/1811/10947 Other Identifiers: 1979-RH-07