# TIME RESOLVED MILLIMETER-WAVE DOUBLE RESONANCE MEASUREMENTS OF INELASTIC COLLSIONS OF NO-He AT 4.2 K

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 Title: TIME RESOLVED MILLIMETER-WAVE DOUBLE RESONANCE MEASUREMENTS OF INELASTIC COLLSIONS OF NO-He AT 4.2 K Creators: Ball, C. D.; De Lucia, Frank C. Issue Date: 1999 Publisher: Ohio State University Abstract: We have directly measured A-doublet and hyperfine branching ratios and absolute cross sections for rotationally inelastic collisions of NO-He. We employed a collisional cooling cell at 4.2 K in conjunction with time resolved millimeter-wave/millimeter-wave double resonance techniques. The data were analyzed in the context of tensor opacities, which characterize the electrostatic interaction, and angular momentum recoupling, justified by the spectator'' role of the nuclear spin during a collision. Our cross sections agree qualitatively with theoretically predicted propensity rules. Description: Author Institution: Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Department of Physics, The Ohio State University, Columbus, OH URI: http://hdl.handle.net/1811/19445 Other Identifiers: 1999-TC-03