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A new crossed beam approach to vibrationally inelastic scattering in neutral collision systems. State‐to‐state cross sections for He+I* 2 (υ’=15, 25, 35) at E c.m.=89 meV
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15.We are implicitly assuning that there is no significant anisotropy in the angular distribution of ground electronic state molecules due to the nozzle beam expansion. Visser et al. have shown that the degree of molecular alignment is miniscule in pure beams [Chem. Phys. 20, 391 (1977)]
15.Very recently, however, Pullman and Herschbach [J. Chem. Phys. 90, 3881 (1989)] have reported significant amounts of orientational alignment when is seeded in an excess of He or Ar carrier gas. The /He beam used in the present study has a similar value of to the beams studied by Pullman and Herschbach. Therefore, it may be premature to conclude that polarization effects are negligible in our crossed beam experiments. This issue will be addresed explicitly in a future round of experiments.
16.The fiber bundle was purchased from Ealing Optics. To achieve a good vacuum seal, it was necessary to cap one end of the bundle with an optically transparent cement.
17.The Gated Detection System was originally designed and constructed by R. Ensman and A. E. W. Knight at Indiana University.
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19.In the absence of attenuation effects, the beam number densities at the collision zone should be given approximately by where is the stagnation number density, d is the distance from the nozzle to the collision zone, and A is the area of the nozzle orifice. The beam number densities reported in the text were calculated using this formula and then halved to roughly account for skimmer interference. The assumed value of is taken from earlier bulb studies.
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