Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session B09: Collisions and Interactions of Atoms, Ions and Molecules
10:45 AM–12:45 PM,
Tuesday, June 4, 2024
Room: 203C
Chair: Robin Côté, University of Connecticut
Abstract: B09.00010 : Cold and ultracold collisions of molecular hydrogen*
12:33 PM–12:45 PM
Presenter:
Hubert Jozwiak
(Nicolaus Copernicus University in Torun)
Authors:
Hubert Jozwiak
(Nicolaus Copernicus University in Torun)
Piotr Wcislo
(Nicolaus Copernicus University in Toruń)
First, I will present our latest quantum scattering calculations performed on an ab initio potential energy surface for the H2-H2 system. We provided reference data for the analysis of the first cryogenic (T = 5 K) spectra of H2, and we demonstrated that collisional broadening and shift of a fundamental transition in H2 are dominated by one, l = 2 partial wave. This result validates the previously unexplored area of line-shape theory for physically indistinguishable molecules.
I will also discuss the results of our recent study of the effect of hyperfine and Zeeman interactions on ultracold Li – H2 collisions in the presence of an external magnetic field. We obtained a favorable ratio of the cross-sections for elastic-to-inelastic collisions for the low-field-seeking Zeeman states of H2, suggesting the feasibility of sympathetic cooling of molecular hydrogen by atomic lithium.
Finally, we explore collisions of distinguishable hydrogen isotopologues under conditions relevant to the atmospheres of giant planets. We provide ab initio collisional parameters for the strongest HD lines perturbed by H2. We demonstrate that subtle effects, such as the speed dependence of collisional broadening and shift and line narrowing, can affect the effective width and height of HD lines by a factor of 2.
*The research is supported by the National Science Centre in Poland through Project No. 2019/35/B/ST2/01118. We gratefully acknowledge Polish high-performance computing infrastructure PLGrid (HPC Centers: ACK Cyfronet AGH, CI TASK) for providing computer facilities and support within computational grant no. PLG/2023/016279. Calculations have been carried out using resources provided by Wroclaw Centre for Networking and Supercomputing (http://wcss.pl), grant no. 546. The research is a part of the program of the National Laboratory FAMO in Toruń, Poland.
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