Kinetic study of energy transfer from He(n=2,3) to Ne, Ar, Kr, and Xe

Time-resolved spectroscopic studies have been carried out on various emissions from He-Ar, He-Kr, He-Xe, and He-Ne mixtures to obtain kinetic information and quenching cross sections following charged-particle excitation. Our results are consistent with the pathways model of Payne, Klots, and Hurst in which Jesse effects are due primarily to energy transfer from He(2S1) to an atom or molecule which is consequentially ionized. Quenching cross sections for He(2S1))-Ar, -Kr, and -Xe at thermal (300°K) collision energy were obtained as 22.5, 42, and 70 2, respectively, with an accuracy of 10%. These results are smaller than theoretical calculations which make use of the orbiting approximation, but agree well with experimental data obtained by crossed-molecular-beam methods. Using the same method, we obtained for the first time room-temperature quenching cross sections for He(2P1))-Ar and He(3P1))-Ne, -Ar, -Kr, -Xe (142 ± 42, 42 ± 4, 53 ± 5, 39 ± 4, and 73 ± 7 2, respectively). These results are larger than theoretical calculations based on the dipoledipole mechanism by Katsuura and Watanabe. Quenching cross sections for He(3P3))-Ne, -Ar, -Kr, -Xe, and He(3D1))-Ne were obtained as 32 ± 5, 22 ± 3, 17 ± 3, 67 ± 10, and 30 ± 5 2, respectively.