High Resolution Rovibrational and Rotational Spectroscopy of H${}_2$CCCH${}^{+}$

Abstract

The rovibrational spectrum of the molecular ion H${}_2$CCCH${}^{+}$ was investigated in a 4~K cryogenic ion trap instrument employing the leak-out spectroscopy method. Transitions within the fundamental ${\nu }_1$ (C-H stretch) and the combination band ${\nu }_3$+${\nu }_5$ (C-C stretches) were detected, the search aided by high level quantum chemical calculations. The analysis of the rovibrational measurements enabled us to predict the rotational structure of the ground state. Using a rotational-vibrational double-resonance scheme, 14 pure rotational transitions were measured. This, in turn, led to the radio astronomical detection of H${}_2$CCCH${}^{+}$ in the interstellar medium, as recently reported (Silva et al., Astron. Astrophys. 676, L1, 2023).

Accepted 12 Dec 2023, Published online: 29 Dec 2023. Molecular Physics (2023), Article: e2296613

References in corpus (3)

• Leak-out Spectroscopy, a universal method of action spectroscopy in cold ion traps
• Discovery of H${}_2$CCCH${}^{+}$ in TMC-1
• High-resolution spectroscopy of the ${\nu }_3$ antisymmetric C-H stretch of C${}_2$H${}_2^{+}$ using leak-out action spectroscopy

Cited by in corpus (3)

• Spectroscopic Detection and Characterization of Cyanooxomethylium, NCCO${}^{+}$
• High-resolution ro-vibrational and rotational spectroscopy of the open-shell, linear CCH${}^{+}$ ion (${}^3\Pi$)
• Experimental proof of strong $\Pi$-$\Sigma$ mixing in the Renner-Teller and Pseudo-Jahn-Teller affected CCH${}^{+}$ (${}^3\Pi$) ion