Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 6, Issue 21, Pages 4194-4199Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.5b02060
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Funding
- CNRS program PCMI
- CNRS program PNP
- U.S. DOE [DE-FG02-05ER15694]
- European Regional Development Fund
- Republic of Cyprus through the Research Promotion Foundation [Cy-Tera NEA YPiODeltaOMH/SigmaTPATH/0308/31]
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Quantum mechanical calculations are important tools for predicting the rates of elementary reactions, particularly for those involving hydrogen and at low temperatures where quantum effects become increasingly important. These approaches are computationally expensive, however, particularly when applied to complex polyatomic systems or processes characterized by deep potential wells. While several approximate techniques exist, many of these have issues with reliability. The ring-polymer molecular dynamics method was recently proposed as an accurate and efficient alternative. Here, we test this technique at low temperatures (300-50 K) by analyzing the behavior of the barrierless C(D-1) + H-2 reaction over the two lowest singlet potential energy surfaces. To validate the theory, rate coefficients were measured using a supersonic flow reactor down to 50 K. The experimental and theoretical rates are in excellent agreement, supporting the future application of this method for determining the kinetics and dynamics of a wide range of low-temperature reactions.
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