Title

Stereodynamic Control of Cold Rotationally Inelastic CO + HD Collisions

Document Type

Article

Publication Date

8-11-2021

Publication Title

Physical Chemistry Chemical Physics

Volume

23

Issue

35

First page number:

19364

Last page number:

19374

Abstract

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 D2by 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 ofL= 1 andL= 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.

Controlled Subject

Molecular dynamics; Energy levels (Quantum mechanics)

Disciplines

Physical Chemistry | Quantum Physics

Language

English


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