Optical coherent transient measurements of velocity-changing collisions in SF6
Optics Letters, Vol. 6, Issue 1, pp. 45-47 (1981)
http://dx.doi.org/10.1364/OL.6.000045
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Abstract
Elastic velocity-changing collisions have been observed for the first time to our knowledge in a nonpolar molecule by photon-echo studies of SF6 using a frequency-switched CO2 laser that we have developed. The photon-echo decay is nonexponential and reveals the velocity-changing collision cross section to be σvc = 180 Å2, with an average velocity change per collision of Δu = 155 cm/sec. Using delayed optical nutation, we also determine the cross section for the population decay rate (1/T1) to be σpop=335 Å2. To within experimental accuracy, we find that phaseinterrupting collisions are not important (T1≃ T2). A comparison of these cross sections with those for the polar molecule 13CH3F is made.
© 1981 Optical Society of America
Citation
B. Comaskey, R. E. Scotti, and R. L. Shoemaker, "Optical coherent transient measurements of velocity-changing
collisions in SF6," Opt. Lett. 6, 45-47 (1981)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-6-1-45
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