We have studied the fundamental rotational relaxation and excitation collision of OHˉJ = 0 ↔ 1 with helium at different collision energies. Using state-selected photodetachment in a cryogenic ion trap, the collisional excitation of the first excited rotational state of OHˉ has been investigated and absolute inelastic collision rate coefficients have been extracted for collision temperatures between 20 and 35 K. The rates are compared with accurate quantum scattering calculations for three different potential-energy surfaces. Good agreement is found within the experimental accuracy, but the experimental trend of increasing collision rates with temperature is only in part reflected in the calculations.
E. S. Endres et al., "Temperature-Dependent Rotationally Inelastic Collisions of OHˉ and He," Physical Review A, vol. 103, no. 5, American Physical Society (APS), May 2021.
The definitive version is available at https://doi.org/10.1103/PhysRevA.103.052807
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01 May 2021