Stereodynamic control of cold rotationally inelastic CO + HD collisions
| Autor: | F. Javier Aoiz, Pablo G. Jambrina, James F. E. Croft, Naduvalath Balakrishnan |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Chemical Physics (physics.chem-ph) General Physics and Astronomy FOS: Physical sciences Parity (physics) 02 engineering and technology 021001 nanoscience & nanotechnology Quantum number Collision 01 natural sciences symbols.namesake Quantum state Physics - Chemical Physics 0103 physical sciences symbols Scattering theory Physical and Theoretical Chemistry Atomic physics 010306 general physics 0210 nano-technology Raman spectroscopy Adiabatic process Molecular beam |
| DOI: | 10.48550/arxiv.2107.00259 |
| Popis: | Quantum control of molecular collision dynamics is an exciting emerging area of cold collisions. Co-expansion of collision partners in a supersonic molecular beam combined with precise control of their quantum states and alignment/orientation using Stark-induced Adiabatic Raman Passage allows exquisite stereodynamic control of the collision outcome. This approach has recently been demonstrated for rotational quenching of HD in collisions with H2, D2, and He and D2 by He. Here we illustrate this approach for HD(v = 0, j = 2) + CO(v = 0, j = 0) → HD(v' = 0, j') + CO(v' = 0, j') collisions through full-dimensional quantum scattering calculations at collision energies near 1 K. It is shown that the collision dynamics at energies between 0.01-1 K are controlled by an interplay of L = 1 and L = 2 partial wave resonances depending on the final rotational levels of the two molecules. Polarized cross sections resolved into magnetic sub-levels of the initial and final rotational quantum numbers of the two molecules also reveal a significant stereodynamic effect in the cold energy regime. Overall, the stereodynamic effect is controlled by both geometric and dynamical factors, with parity conservation playing an important role in modulating these contributions depending on the particular final state. |
| Databáze: | OpenAIRE |
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