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High-resolution spectroscopy of [H,C,N](+): II. Ground state rotational spectrum of HCN(+) (X̃(2)Π).
PubMed
Authors: Silva WGDP, Schmid PC, Gupta D, Thorwirth S, Sarka J, Asvany O, Schlemmer S
Year
2026
Paper ID
9776
Status
Peer-reviewed
Abstract Read
~2 min
Abstract Words
109
Citations
N/A
Abstract
The rotational spectrum of HCN has been measured between 270 and 520 GHz in a cryogenic ion trap instrument employing a double resonance vibrational-rotational scheme based on leak-out spectroscopy. A total of four transitions with quantum numbers ranging from ″ = 2.5 to 5.5 have been observed for the lowest-energy spin-orbit state Π of this open-shell cation, which has an inverted Π electronic ground state. The transitions show well-resolved -doubling components each displaying complex hyperfine splittings due to the presence of two nuclei with non-zero spins, H = 1/2 and N = 1. The accurate transition frequencies and ground state spectroscopic parameters determined for HCN in this work will enable radio astronomical searches of this important cation in the interstellar medium.
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- The rotational spectrum of HCN has been measured between 270 and 520 GHz in a cryogenic ion trap instrument employing a double resonance vibrational-rotational scheme based on...
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