Imaging Resonance Effects in C + H_2 Collisions using a Zeeman Decelerator
arxiv(2023)
摘要
An intriguing phenomenon in molecular collisions is the occurrence of
scattering resonances, which originate from bound and quasi-bound states
supported by the interaction potential at low collision energies. The resonance
effects in the scattering behaviour are extraordinarily sensitive to the
interaction potential, and their observation provides one of the most stringent
tests for theoretical models. We present high-resolution measurements of
state-resolved angular scattering distributions for inelastic collisions
between Zeeman-decelerated C(^3P_1) atoms and para-H_2 molecules
at collision energies ranging from 77 cm^-1 down to 0.5 cm^-1. Rapid
variations in the angular distributions were observed that can be attributed to
the consecutive reduction of contributing partial waves and effects of
scattering resonances. The measurements showed excellent agreement with
distributions predicted by ab initio quantum scattering
calculations. However, discrepancies were found at specific collision energies,
which most likely originate from an incorrectly predicted quasi-bound state.
These observations provide exciting prospects for further high-precision and
low-energy investigations of scattering processes that involve paramagnetic
species.
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