Vibrational Satellites of C${}_2$S, C${}_3$S, and C${}_4$S: Microwave Spectral Taxonomy as a Stepping Stone to the Millimeter-Wave Band

Abstract

We present a microwave spectral taxonomy study of several hydrocarbon/CS${}_2$ discharge mixtures in which more than 60 distinct chemical species, their more abundant isotopic species, and/or their vibrationally excited states were detected using chirped-pulse and cavity Fourier-transform microwave spectroscopies. Taken together, in excess of 85 unique variants were detected, including several new isotopic species and more than 25 new vibrationally excited states of C${}_2$S, C${}_3$S, and C${}_4$S, which have been assigned on the basis of published vibration-rotation interaction constants for C${}_3$S, or newly calculated ones for C${}_2$S and C${}_4$S. On the basis of these precise, low-frequency measurements, several vibrationally exited states of C${}_2$S and C${}_3$S were subsequently identified in archival millimeter-wave data in the 253--280 GHz frequency range, ultimately providing highly accurate catalogs for astronomical searches. As part of this work, formation pathways of the two smaller carbon-sulfur chains were investigated using ${}^{13}$C isotopic spectroscopy, as was their vibrational excitation. The present study illustrates the utility of microwave spectral taxonomy as a tool for complex mixture analysis, and as a powerful and convenient `stepping stone' to higher frequency measurements in the millimeter and submillimeter bands.

arXiv commentAccepted in PCCP

References in corpus (11)

• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• The ALMA Protostellar Interferometric Line Survey (PILS): First results from an unbiased submillimeter wavelength line survey of the Class 0 protostellar binary IRAS 16293-2422 with ALMA
• Detection of C5N- and vibrationally excited C6H in IRC +10216
• Exploring Molecular Complexity with ALMA (EMoCA): Deuterated complex organic molecules in Sagittarius B2(N2)
• New molecules in IRC+10216: confirmation of C${}_5$S and tentative identification of MgCCH, NCCP, and SiH${}_3$CN
• Detection of E-cyanomethanimine towards Sagittarius B2(N) in the Green Bank Telescope PRIMOS Survey
• The Detection of Interstellar Ethanimine (CH3CHNH) from Observations taken during the GBT PRIMOS Survey
• Unveiling the dust nucleation zone of IRC+10216 with ALMA
• Non-Detection of HC${}_{11}$N toward TMC-1: Constraining the Chemistry of Large Carbon-Chain Molecules
• Detection of Interstellar HC${}_5$O in TMC-1 with the Green Bank Telescope
• Rotational spectra of isotopic species of methyl cyanide, CH${}_3$CN, in their $v_8=1$ excited vibrational states

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• Gas phase detection and rotational spectroscopy of ethynethiol, HCCSH
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