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- W3165161490 abstract "We report the detection, for the first time in space, of cyano thioformaldehyde (HCSCN) and propynethial (HCSCCH) towards the starless core TMC-1. Cyano thioformaldehyde presents a series of prominent a - and b -type lines, which are the strongest previously unassigned features in our Q -band line survey of TMC-1. Remarkably, HCSCN is four times more abundant than cyano formaldehyde (HCOCN). On the other hand, HCSCCH is five times less abundant than propynal (HCOCCH). Surprisingly, we find an abundance ratio HCSCCH/HCSCN of ∼0.25, in contrast with most other ethynyl-cyanide pairs of molecules for which the CCH-bearing species is more abundant than the CN-bearing one. We discuss the formation of these molecules in terms of neutral-neutral reactions of S atoms with CH 2 CCH and CH 2 CN radicals as well as of CCH and CN radicals with H 2 CS. The calculated abundances for the sulphur-bearing species are, however, significantly below the observed values, which points to an underestimation of the abundance of atomic sulphur in the model or to missing formation reactions, such as ion-neutral reactions." @default.
- W3165161490 created "2021-06-07" @default.
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- W3165161490 date "2021-06-01" @default.
- W3165161490 modified "2023-10-15" @default.
- W3165161490 title "The sulphur saga in TMC-1: Discovery of HCSCN and HCSCCH" @default.
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- W3165161490 doi "https://doi.org/10.1051/0004-6361/202141297" @default.
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