Observation of quantum capture in an ion-molecule reaction. Höveler, K., Deiglmayr, J., Agner, J. A., Hahn, R., Zhelyazkova, V., & Merkt, F. Physical Review A, 106(5):052806, November, 2022. Publisher: American Physical Society![Observation of quantum capture in an ion-molecule reaction [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 1 download Vogt and Wannier [Phys. Rev. 95, 1190 (1954)] predicted that the capture rate of a polarizable neutral atom or molecule by an ion should increase by a factor of 2 compared to the classical Langevin rate as the collision energy approaches zero. This prediction has not been verified experimentally. The H+2 + H2 reaction is ideally suited to observe this effect because the small reduced mass makes quantum effects related to s-wave scattering observable at higher collision energies than in other systems. Moreover, the reaction rate for this barrierless, strongly exothermic reaction follows the classical Langevin capture model down to cold-collision conditions (about kB×1 K) and is not affected by short-range interactions. Below this temperature, a strong enhancement of the reaction rate resulting from charge–quadrupole interaction between H+2 and ground-state ortho H2 (J=1) was observed. Here we present an experimental study of the reaction of H+2 and para H2 (J=0), which has no dipole and no quadrupole moments, at collision energies below kB×1 K. We observe an enhancement at the lowest collision energies which is attributed to the quantum enhancement predicted by Vogt and Wannier. Measurements of the reaction of HD+ with HD support this conclusion.
@article{hoveler_observation_2022,
title = {Observation of quantum capture in an ion-molecule reaction},
volume = {106},
url = {https://link.aps.org/doi/10.1103/PhysRevA.106.052806},
doi = {10.1103/PhysRevA.106.052806},
abstract = {Vogt and Wannier [Phys. Rev. 95, 1190 (1954)] predicted that the capture rate of a polarizable neutral atom or molecule by an ion should increase by a factor of 2 compared to the classical Langevin rate as the collision energy approaches zero. This prediction has not been verified experimentally. The H+2 + H2 reaction is ideally suited to observe this effect because the small reduced mass makes quantum effects related to s-wave scattering observable at higher collision energies than in other systems. Moreover, the reaction rate for this barrierless, strongly exothermic reaction follows the classical Langevin capture model down to cold-collision conditions (about kB×1 K) and is not affected by short-range interactions. Below this temperature, a strong enhancement of the reaction rate resulting from charge–quadrupole interaction between H+2 and ground-state ortho H2 (J=1) was observed. Here we present an experimental study of the reaction of H+2 and para H2 (J=0), which has no dipole and no quadrupole moments, at collision energies below kB×1 K. We observe an enhancement at the lowest collision energies which is attributed to the quantum enhancement predicted by Vogt and Wannier. Measurements of the reaction of HD+ with HD support this conclusion.},
number = {5},
urldate = {2022-11-15},
journal = {Physical Review A},
author = {Höveler, Katharina and Deiglmayr, Johannes and Agner, Josef A. and Hahn, Raphaël and Zhelyazkova, Valentina and Merkt, Frédéric},
month = nov,
year = {2022},
note = {Publisher: American Physical Society},
keywords = {Cold chemistry, Cold molecules},
pages = {052806},
}
Downloads: 1
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Moreover, the reaction rate for this barrierless, strongly exothermic reaction follows the classical Langevin capture model down to cold-collision conditions (about kB×1 K) and is not affected by short-range interactions. Below this temperature, a strong enhancement of the reaction rate resulting from charge–quadrupole interaction between H+2 and ground-state ortho H2 (J=1) was observed. Here we present an experimental study of the reaction of H+2 and para H2 (J=0), which has no dipole and no quadrupole moments, at collision energies below kB×1 K. We observe an enhancement at the lowest collision energies which is attributed to the quantum enhancement predicted by Vogt and Wannier. 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