Overtone Transition $2{\nu }_1$ of ${\text{HCO}}^{+}$ and ${\text{HOC}}^{+}$: Origin, Radiative Lifetime, Collisional Quenching

Abstract

We present spectra of the first overtone vibration transition of $\text{C-H}$/$\text{O-H}$ stretch ($2{\nu }_1$) in ${\text{HCO}}^{+}$ and ${\text{HOC}}^{+}$, recorded using a laser induced reaction action scheme inside a cryogenic 22 pole radio frequency trap. Band origins have been located at 6078.68411(19) and 6360.17630(26) ${\text{cm}}^{-1}$, respectively. We introduce a technique based on mass selective ejection from the ion trap for recording background free action spectra. Varying the number density of the neutral action scheme reactant (${\text{CO}}_2$ and Ar, respectively) and collisional partner reactant inside the ion trap, permitted us to estimate the radiative lifetime of the state to be 1.53(34) and 1.22(34) ms, respectively, and the collisional quenching rates of ${\text{HCO}}^{+}$ ($2{\nu }_1$) with He, H${}_2$, and N${}_2$.

To appear in ChemPhysChem

References in corpus (7)

• Leak-out Spectroscopy, a universal method of action spectroscopy in cold ion traps
• 3 mm spectral line survey of two lines of sight toward two typical cloud complexes in the Galactic Center
• Starburst Energy Feedback Seen Through HCO${}^{+}$/HOC${}^{+}$ Emission in NGC 253 from ALCHEMI
• Rovibrational quenching of C${}_2$-anions in collisions with He, Ne, and Ar atoms
• Cold CAS Ion Trap -- 22 pole trap with ring electrodes for astrochemistry
• An improved study of HCO+ and He system: interaction potential, collisional relaxation and pressure broadening
• Vibrational Quenching of CN- in Collisions with He and Ar

Cited by in corpus (2)

• Rovibrational Overtone and Combination Bands of the HCNH+ Ion
• Near-infrared high resolution overtone spectroscopy of the hydronium ion H${}_3$O${}^{+}$: the $2{\nu }_3^{2+}$ and $2{\nu }_3^{2-}$ bands