High Resolution Overtone Spectroscopy of HNC${}^{+}$ and HCN${}^{+}$

Abstract

Rotationally resolved spectra of the HNC${}^{+}$ and HCN${}^{+}$ molecular ions have been recorded in the spectral range between 6200 and 6800 \rcm\ using a cryogenic ion trap instrument. The rovibrational transitions were probed using two different action spectroscopy schemes, namely laser-induced reaction (LIR) and leak-out spectroscopy (LOS). Various vibrational bands of HNC${}^{+}$ and HCN${}^{+}$ were measured with high resolution for the first time. For HNC${}^{+}$, the $\text{X}{}^2{\Sigma }^{+}(20^{0}0)-(00^{0}0)$ overtone band was recorded using LIR, while LOS was used to probe the $\text{X}{}^2\Pi (000{)}^1-(210{)}^0\mu$ combination band and the $\text{X}{}^2\Pi (000{)}^1-\text{A}{}^2{\Sigma }^{+}(10^{0}0)$ vibronic band of HCN${}^{+}$. Spectroscopic constants, band origins and radiative lifetimes for the observed states have been determined. The effective fit for the HCN${}^{+}$ spectra revealed the presence of strong vibrational couplings leading to perturbations of the rovibrational levels of the excited states. The two action spectroscopy schemes are compared and their potential use to explore ion-molecule interactions is discussed.

arXiv commentAccepted in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

References in corpus (6)

• The Cologne Database for Molecular Spectroscopy, CDMS, in the Virtual Atomic and Molecular Data Centre, VAMDC
• The interstellar gas-phase chemistry of HCN and HNC
• Comparative Chemistry of Diffuse Clouds II: CN, HCN, HNC, CH3CN & N2H+
• Leak-out Spectroscopy, a universal method of action spectroscopy in cold ion traps
• Detection of the HC${}_3$NH${}^{+}$ and HCNH${}^{+}$ ions in the L1544 pre-stellar core
• First survey of HCNH${}^{+}$ in high-mass star-forming cloud cores

Cited by in corpus (2)

• 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