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- W2079279488 abstract "The principal purpose of this investigation is the determination of the tunneling half-lives of the trans -HCSH → H 2 CS and the trans -HCSeH → H 2 CSe unimolecular isomerization reactions at temperatures close to 0 K. To aid these determinations, accurate electronic structure computations were performed, with electron correlation treatments as extensive as CCSDT(Q) and basis sets as large as aug-cc-pCV5Z, for the isomers of [H,H,C,S] and [H,H,C,Se] on their lowest singlet surfaces and for the appropriate transition states yielding structural data for key stationary points characterizing the isomerization reactions. The computational results were subjected to a focal-point analysis (FPA) that yields accurate relative energies with uncertainty estimates. The tunneling half-lives were determined by a simple Eckart-barrier approach and via the more sophisticated though still one-dimensional Wentzel–Kramers–Brillouin (WKB) approximation. Only stationary-point information is needed for the former while an intrinsic reaction path (IRP) is necessary for the latter approach. Both protocols suggest that, unlike for the parent hydroxymethylene (HCOH), at the low temperatures of matrix isolation experiments no tunneling will be observable for the trans -HCSH and trans -HCSeH systems." @default.
- W2079279488 created "2016-06-24" @default.
- W2079279488 creator A5027412086 @default.
- W2079279488 creator A5070824562 @default.
- W2079279488 creator A5088764108 @default.
- W2079279488 date "2011-01-01" @default.
- W2079279488 modified "2023-09-24" @default.
- W2079279488 title "Do the mercaptocarbene (H–C–S–H) and selenocarbene (H–C–Se–H) congeners of hydroxycarbene (H–C–O–H) undergo 1,2-H-tunneling?" @default.
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- W2079279488 doi "https://doi.org/10.1135/cccc2011053" @default.
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