Zero-Point-Energy Driven Isotopic Exchange of the [HO] anion Probed by Mid-Infrared Action Spectroscopy.

We present the first observation of vibrational transitions in the [HO] anion, an intermediate in the anion-molecule reaction of water, HO, and hydride, H, using a laser-induced isotopic H/D exchange reaction action spectroscopy scheme applied to anions. The observed bands are assigned as the fundamental and first overtone of the HO-H vibrational stretching mode, based on anharmonic calculations within the vibrational perturbation theory and vibrational configuration interaction. Although the DO·D species has the lowest energy, our experiments confirm the DO·H isotope to be a sink of the H/D exchange reaction.

Overtone Transition 2ν of HCO and HOC: Origin, Radiative Lifetime, Collisional Quenching.

We present spectra of the first overtone vibration transition of C-H/ O-H stretch (2ν) in HCO and 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.

Measurements of rate coefficients of CN+, HCN+, and HNC+ collisions with H2 at cryogenic temperatures.

The experimental determination of the reaction rate coefficients for production and destruction of HCN+ and HNC+ in collision with H2 is presented. A variable-temperature, 22-pole radio frequency ion trap was used to study the reactions in the temperature range 17-250 K. The obtained rate coefficients for the reaction of CN+ and HCN+ with H2 are close to the collisional (Langevin) value, whereas that for the reaction of HNC+ with H2 is quickly decreasing with increasing temperature.

Vibrational Predissociation Spectra of C N and C N : Bending and Stretching Vibrations.

We present infrared predissociation spectra of C N (H ) and C  N (H ) in the 300-1850 cm range. Measurements were performed using the FELion cryogenic ion trap end user station at the Free Electron Lasers for Infrared eXperiments (FELIX) laboratory. For C N (H ), we detected the CCN bending and CC-N stretching vibrations.

Gas-Phase Vibrational Spectroscopy of the Hydrocarbon Cations l-CH, HCH, and c-CH: Structures, Isomers, and the Influence of Ne-Tagging.

We report the first gas-phase vibrational spectra of the hydrocarbon ions CH and CH. The ions were produced by electron impact ionization of allene. Vibrational spectra of the mass-selected ions tagged with Ne were recorded using infrared predissociation spectroscopy in a cryogenic ion trap instrument using the intense and widely tunable radiation of a free electron laser.