Please use this identifier to cite or link to this item: http://dx.doi.org/10.18419/opus-11229
Authors: Tschöpe, Martin
Schröder, Benjamin
Erfort, Sebastian
Rauhut, Guntram
Title: High-level rovibrational calculations on ketenimine
Issue Date: 2021
metadata.ubs.publikation.typ: Zeitschriftenartikel
metadata.ubs.publikation.seiten: 15, 3
metadata.ubs.publikation.source: Frontiers in chemistry 8 (2021), article 623641
URI: http://elib.uni-stuttgart.de/handle/11682/11246
http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-112460
http://dx.doi.org/10.18419/opus-11229
ISSN: 2296-2646
Abstract: From an astrochemical point of view ketenimine (CH2CNH) is a complex organic molecule (COM) and therefore likely to be a building block for biologically relevant molecules. Since it has been detected in the star-forming region Sagittarius B2(N), it is of high relevance in this field. Although experimental data are available for certain bands, for some energy ranges such as above 1200 cm-1 reliable data virtually do not exist. In addition, high-level ab initio calculations are neither reported for ketenimine nor for one of its deuterated isotopologues. In this paper, we provide for the first time data from accurate quantum chemical calculations and a thorough analysis of the full rovibrational spectrum. Based on high-level potential energy surfaces obtained from explicitly correlated coupled-cluster calculations including up to 4-mode coupling terms, the (ro)vibrational spectrum of ketenimine has been studied in detail by variational calculations relying on rovibrational configuration interaction (RVCI) theory. Strong Fermi resonances were found for all isotopologues. Rovibrational infrared intensities have been obtained from dipole moment surfaces determined from the distinguishable cluster approximation. A comparison of the spectra of the CH2CNH molecule with experimental data validates our results, but also reveals new insight about the system, which shows very strong Coriolis coupling effects.
Appears in Collections:03 Fakultät Chemie

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