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13 February 2025 |
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Article overview
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Millimeter-wave spectrum of 2-propanimine | Luyao Zou
; Jean-Claude Guillemin
; Arnaud Belloche
; Jes K. Jørgensen
; Laurent Margulès
; Roman A. Motiyenko
; Peter Groner
; | Date: |
1 Feb 2023 | Abstract: | Up to date, only 6 imines have been detected in the interstellar medium. The
3-carbon imine, 2-propanimine ((CH$_3$)$_2$C=NH), is predicted to be the
structural isomer with the lowest energy in the C$_3$H$_7$N group, and appears
to be a good candidate for astronomical searches. Unexpectedly, no microwave or
millimeter wave spectrum is available for 2-propanimine. In this work, we
provide the first high resolution millimeter wave spectrum of 2-propanimine and
its analysis. With the guide of this laboratory measurement, we aim to search
for 2-propanimine in two molecule-rich sources Sgr B2(N) and IRAS 16293-2422
using observations from the Atacama Large Millimeter/submillimeter Array
(ALMA). Starting from a synthesized sample, we measured the spectrum of
2-propanimine from 50 to 500 GHz, and the ground state lines are successfully
assigned and fitted using XIAM and ERHAM programs with the aid of theoretical
calculations. The barriers to internal rotation of the two CH$_3$ tops are
determined to be 531.956(64) cm$^{-1}$ and 465.013(26) cm$^{-1}$. These data
are able to provide reliable prediction of transition frequencies for
astronomical search. Although a few line matches exist, no confirmed detection
of 2-propanimine has been found in the hot molecular core Sgr B2(N1S) and the
Class 0 protostar IRAS 16293B. Upper-limits of its column density have been
derived, and indicate that 2-propanimine is at least 18 times less abundant
than methanimine in Sgr B2(N1S), and is at most 50-83 % of methanimine in IRAS
16293B. | Source: | arXiv, 2302.00372 | Services: | Forum | Review | PDF | Favorites |
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