Rotational spectroscopy of oxirane-2,2-d2, c-CD2CH2O, and its tentative detection toward IRAS 16293-2422 B
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We prepared a sample of oxirane doubly deuterated at one C atom and studied its rotational spectrum in the laboratory for the first time between 120 GHz and 1094 GHz. Accurate spectroscopic parameters up to eighth order were determined, and the calculated rest frequencies were used to identify c-CD2CH2O tentatively in the interstellar medium in the Atacama Large Millimeter/submillimeter Array Protostellar Interferometric Line Survey (PILS) of the Class 0 protostellar system IRAS 16293-2422. The c-CD2CH2O to c-C2H4O ratio was estimated to be ∼0.054 with Trot=125 K. This value translates to a D-to-H ratio of ∼0.16 per H atom which is higher by a factor of 4.5 than the ∼0.036 per H atom obtained for c-C2H3DO. Such increase in the degree of deuteration referenced to one H atom in multiply deuterated isotopologs compared to their singly deuterated variants have been observed commonly in recent years.
Original language | English |
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Article number | 111777 |
Journal | Journal of Molecular Spectroscopy |
Volume | 394 |
Number of pages | 8 |
ISSN | 0022-2852 |
DOIs | |
Publication status | Published - Apr 2023 |
Bibliographical note
Publisher Copyright:
© 2023 Elsevier Inc.
- Interstellar molecule, Molecular symmetry, Reduced Hamiltonian, Rotational spectroscopy, Submillimeter spectroscopy
Research areas
Links
- https://arxiv.org/pdf/2304.12045.pdf
Submitted manuscript
ID: 358430539