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Issue 1, 2017
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An experimental and theoretical investigation of the C(1D) + D2 reaction

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Abstract

In a previous joint experimental and theoretical study of the barrierless chemical reaction C(1D) + H2 at low temperatures (300–50 K) [K. M. Hickson, J.-C. Loison, H. Guo and Y. V. Suleimanov, J. Phys. Chem. Lett., 2015, 6, 4194], excellent agreement was found between experimental thermal rate constants and theoretical estimates based on ring polymer molecular dynamics (RPMD) over the two lowest singlet potential energy surfaces (PESs). Here, we extend this work to one of its isotopologues, C(1D) + D2, over the same temperature range. Experimental and RPMD results are in good agreement when contributions from both PESs to this chemical reaction are included in the RPMD simulations. The deviation between experiment and the RPMD calculations does not exceed 25% and both results exhibit a slight negative temperature dependence. The first excited 1A′′ PES plays a more important role than the ground 1A′ PES as the temperature is decreased, similar to our previous studies of the C(1D) + H2 reaction but with a more pronounced effect. The small differences in temperature dependence between the earlier and present experimental studies of C(1D) + H2/D2 reactions are discussed in terms of the use of non-equilibrium populations of ortho/para-H2/D2. We argue that RPMD provides a very convenient and reliable tool to study low-temperature chemical reactions.

Graphical abstract: An experimental and theoretical investigation of the C(1D) + D2 reaction

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Supplementary files

Article information


Submitted
28 Oct 2016
Accepted
24 Nov 2016
First published
25 Nov 2016

Phys. Chem. Chem. Phys., 2017,19, 480-486
Article type
Paper

An experimental and theoretical investigation of the C(1D) + D2 reaction

K. M. Hickson and Y. V. Suleimanov, Phys. Chem. Chem. Phys., 2017, 19, 480
DOI: 10.1039/C6CP07381F

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