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Title: Geometric phase effects in the ultracold D + HD $$ \rightarrow $$ D + HD and D + HD $$\leftrightarrow $$ H + D 2 reactions

Abstract

The results of accurate quantum reactive scattering calculations for the D + HD(v = 4, j = 0) $$\to $$ D + HD($$v^{\prime} $$, $$j^{\prime} $$), D + HD(v = 4, j = 0) $$\to $$ H + D2($$v^{\prime} $$, $$j^{\prime} $$) and H + D2(v = 4, j = 0) $$\to $$ D + HD($$v^{\prime} $$, $$j^{\prime} $$) reactions are presented for collision energies between $$1\,\mu {\rm{K}}$$ and $$100\,{\rm{K}}$$. The ab initio BKMP2 PES for the ground electronic state of H3 is used and all values of total angular momentum between $J=0-4$ are included. The general vector potential approach is used to include the geometric phase. The rotationally resolved, vibrationally resolved, and total reaction rate coefficients are reported as a function of collision energy. Rotationally resolved differential cross sections are also reported as a function of collision energy and scattering angle. Large geometric phase effects appear in the ultracold reaction rate coefficients which result in a significant enhancement or suppression of the rate coefficient (up to 3 orders of magnitude) relative to calculations which ignore the geometric phase. The results are interpreted using a new quantum interference mechanism which is unique to ultracold collisions. Significant effects of the geometric phase also appear in the rotationally resolved differential cross sections which lead to a very different oscillatory structure in both energy and scattering angle. Several shape resonances occur in the 1–$$10\,{\rm{K}}$$ energy range and the geometric phase is shown to significantly alter the predicted resonance spectrum. The geometric phase effects and ultracold rate coefficients depend sensitively on the nuclear spin. Furthermore, experimentalists may be able to control the reaction by the selection of a particular nuclear spin state.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1336493
Alternate Identifier(s):
OSTI ID: 1336494; OSTI ID: 1345159
Report Number(s):
LA-UR-16-25136
Journal ID: ISSN 1367-2630
Grant/Contract Number:  
20140309ER; AC52-06NA25396
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 18 Journal Issue: 12; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Inorganic and Physical Chemistry; Ultracold chemistry, cold molecules, geometric phase

Citation Formats

Kendrick, B. K., Hazra, Jisha, and Balakrishnan, N. Geometric phase effects in the ultracold D + HD $ \rightarrow $ D + HD and D + HD $\leftrightarrow $ H + D 2 reactions. United Kingdom: N. p., 2016. Web. doi:10.1088/1367-2630/aa4fd2.
Kendrick, B. K., Hazra, Jisha, & Balakrishnan, N. Geometric phase effects in the ultracold D + HD $ \rightarrow $ D + HD and D + HD $\leftrightarrow $ H + D 2 reactions. United Kingdom. https://doi.org/10.1088/1367-2630/aa4fd2
Kendrick, B. K., Hazra, Jisha, and Balakrishnan, N. Thu . "Geometric phase effects in the ultracold D + HD $ \rightarrow $ D + HD and D + HD $\leftrightarrow $ H + D 2 reactions". United Kingdom. https://doi.org/10.1088/1367-2630/aa4fd2.
@article{osti_1336493,
title = {Geometric phase effects in the ultracold D + HD $ \rightarrow $ D + HD and D + HD $\leftrightarrow $ H + D 2 reactions},
author = {Kendrick, B. K. and Hazra, Jisha and Balakrishnan, N.},
abstractNote = {The results of accurate quantum reactive scattering calculations for the D + HD(v = 4, j = 0) $\to $ D + HD($v^{\prime} $, $j^{\prime} $), D + HD(v = 4, j = 0) $\to $ H + D2($v^{\prime} $, $j^{\prime} $) and H + D2(v = 4, j = 0) $\to $ D + HD($v^{\prime} $, $j^{\prime} $) reactions are presented for collision energies between $1\,\mu {\rm{K}}$ and $100\,{\rm{K}}$. The ab initio BKMP2 PES for the ground electronic state of H3 is used and all values of total angular momentum between $J=0-4$ are included. The general vector potential approach is used to include the geometric phase. The rotationally resolved, vibrationally resolved, and total reaction rate coefficients are reported as a function of collision energy. Rotationally resolved differential cross sections are also reported as a function of collision energy and scattering angle. Large geometric phase effects appear in the ultracold reaction rate coefficients which result in a significant enhancement or suppression of the rate coefficient (up to 3 orders of magnitude) relative to calculations which ignore the geometric phase. The results are interpreted using a new quantum interference mechanism which is unique to ultracold collisions. Significant effects of the geometric phase also appear in the rotationally resolved differential cross sections which lead to a very different oscillatory structure in both energy and scattering angle. Several shape resonances occur in the 1–$10\,{\rm{K}}$ energy range and the geometric phase is shown to significantly alter the predicted resonance spectrum. The geometric phase effects and ultracold rate coefficients depend sensitively on the nuclear spin. Furthermore, experimentalists may be able to control the reaction by the selection of a particular nuclear spin state.},
doi = {10.1088/1367-2630/aa4fd2},
journal = {New Journal of Physics},
number = 12,
volume = 18,
place = {United Kingdom},
year = {Thu Dec 01 00:00:00 EST 2016},
month = {Thu Dec 01 00:00:00 EST 2016}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1088/1367-2630/aa4fd2

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Works referencing / citing this record:

Non-adiabatic quantum reactive scattering in hyperspherical coordinates
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