HD (v = 1, j = 2, m) orientation controls HD–He rotationally inelastic scattering near 1 K.
In: Journal of Chemical Physics, Jg. 150 (2019-05-07), Heft 17, S. N.PAG- (10S.)
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Zugriff:
To investigate how molecular orientations affect low energy scattering, we have studied the rotational relaxation of HD (v = 1, j = 2, m) → (v′ = 1, j′ = 0) by collision with ground-state He, where v, j, and m designate the vibrational, rotational, and magnetic quantum numbers, respectively. We experimentally probed different collision geometries by preparing three specific m sublevels, including an m entangled sublevel, belonging to a single rovibrational (v = 1, j = 2) energy level within the ground electronic state of HD using Stark-induced adiabatic Raman passage. Low collision energies (0–5 K) were achieved by coexpanding a 1:19 HD:He mixture in a highly collimated supersonic beam, which has defined the direction of the collision velocity and restricted the incoming orbital angular momentum states, defined by the quantum number l, to l ≤ 2. Partial wave analysis of experimental data shows that a single l = 2 input orbital dominates the scattered angular distribution, implying the presence of a collisional resonance. The differential scattering angular distribution exhibits a greater than fourfold stereodynamic preference for the m = 0 input state vs m = ±2, when the quantization axis is oriented parallel to the collision velocity. [ABSTRACT FROM AUTHOR]
Titel: |
HD (v = 1, j = 2, m) orientation controls HD–He rotationally inelastic scattering near 1 K.
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Autor/in / Beteiligte Person: | Perreault, William E. ; Mukherjee, Nandini ; Zare, Richard N. |
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Zeitschrift: | Journal of Chemical Physics, Jg. 150 (2019-05-07), Heft 17, S. N.PAG- (10S.) |
Veröffentlichung: | 2019 |
Medientyp: | academicJournal |
ISSN: | 0021-9606 (print) |
DOI: | 10.1063/1.5096531 |
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