Journal Article

PUBDB-2021-01951

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Rotational spectroscopy of imidazole: Accurate spectroscopic information for three vibrationally excited states and the heavy-atom isotopologues up to 295 GHz

Arenas, B.CFEL*DESY* ; Batra, G.CFEL*DESY* ; Steber, A.CFEL*DESY* ; Bizzocchi, L. ; Pietropolli Charmet, A. ; Giuliano, B. M. ; Caselli, P. ; Harris, B. J. ; Pate, B. H. ; Guillemin, J.-C. ; Schnell, M. (Corresponding author)CFEL*DESY*

2021
Academic Press Orlando, Fla.

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Please use a persistent id in citations: doi:10.1016/j.jms.2021.111452  doi:10.3204/PUBDB-2021-01951

Abstract: We report our analysis of the pure rotational spectra of low-lying vibrationally excited states and heavy-atom rare isotopologues of imidazole. To facilitate searches for imidazole in the interstellar medium, we previously described the analysis of the rotational spectrum of the imidazole main isotopologue across the 2–295 GHz range, and we extend this analysis here. Structure optimisation and anharmonic frequency calculations were performed to aid the spectral analysis. Three vibrationally excited states of imidazole were assigned in our room-temperature spectra, with energies up to approximately 670 cm$^{−1}$ above the vibronic ground state. The vibrational states could act as temperature probes in warmer star-forming regions. The $^{13}$C and $^{15}$N heavy-atom isotopologues were assigned, which allowed for the structure of imidazole in the gas phase to be determined. Structural comparisons are drawn between the related heterocyclic molecules hydantoin and imidazolidine. An experimental gas-phase structure of the former is also determined in this work. The potential detection of the isotopologues could help deduce formation pathways towards imidazole and other nitrogen-containing cyclic compounds in interstellar space.

Note: Two versions attached. 1. The version accpeted by the journal (original accepted form; without journal formatting).2. The final published version from the journal.

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Contributing Institute(s):

1. Spectroscopy of molecular processes (FS-SMP)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. ASTROROT - Unraveling interstellar chemistry with broadband microwave spectroscopy and next-generation telescope arrays (638027) (638027)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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