Salomon, Thomas 
ORCID: 0000-0003-4068-7444, Silva, Weslley G. D. P. ORCID: 0000-0001-8775-8815, Thorwirth, Sven ORCID: 0000-0001-8200-6710, Asvany, Oskar ORCID: 0000-0003-2995-0803 and Schlemmer, Stephan ORCID: 0000-0002-1421-7281
(2026).
High Resolution Leak-Out Spectroscopy of the ν2 Symmetric CH3 Stretching Mode of Protonated Acetonitrile, CH3CNH+.
The Journal of Physical Chemistry A, 130 (1).
pp. 88-95.
American Chemical Society (ACS).
ISSN 1089-5639
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Abstract
The symmetric CH3 stretching mode ν2 of protonated acetonitrile (CH3CNH+), located around 3.4 μm, has been measured at high resolution in a cryogenic 22-pole ion trap apparatus via leak-out spectroscopy. In addition to this fundamental vibrational mode, several close-lying combination bands interfering through Fermi-resonances were detected in its proximity. Two of those have been assigned as the ν5 + 2ν8 and ν5 + ν7 + ν9 combination bands, and three more likely arising from the four-quanta combination mode, ν7 + 2ν9 + ν10. The formation of ground-state combination differences permits the spectroscopic assignment of 227 out of the 261 detected lines. A thorough treatment of the Fermi resonance system yields spectroscopic constants for three of the bands and approximate spectroscopic constants for all remaining ones.
| Item Type: | Article |
| Creators: | Creators Email ORCID ORCID Put Code |
| URN: | urn:nbn:de:hbz:38-798384 |
| Identification Number: | 10.1021/acs.jpca.5c06360 |
| Journal or Publication Title: | The Journal of Physical Chemistry A |
| Volume: | 130 |
| Number: | 1 |
| Page Range: | pp. 88-95 |
| Number of Pages: | 8 |
| Date: | 8 January 2026 |
| Publisher: | American Chemical Society (ACS) |
| ISSN: | 1089-5639 |
| Language: | English |
| Faculty: | Faculty of Mathematics and Natural Sciences |
| Divisions: | Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I |
| Subjects: | Natural sciences and mathematics Physics |
| ['eprint_fieldname_oa_funders' not defined]: | Publikationsfonds UzK |
| Refereed: | Yes |
| URI: | http://kups.ub.uni-koeln.de/id/eprint/79838 |
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