The state-to-state vibrational predissociation (VP) dynamics of the hydrogen-bonded ammonia-acetylene dimer were studied following excitation in the asymmetric CH stretch. Velocity map imaging (VMI) and resonance-enhanced multiphoton ionization (REMPI) were used to determine pair-correlated product energy distributions. Following vibrational excitation of the asymmetric CH stretch fundamental, ...

Mass-resolved excitation spectra of the C1 – X0 band of XeAr were measured under jet-cooled conditions using a tunable coherent vacuum ultraviolet ~VUV! light (l;130 nm) as an excitation light source and a high-resolution (m/Dm;1100) reflectron time-of-flight mass spectrometer. The rotational structure of the C1 – X0 (v8,0) (v852 – 6) vibronic bands were recorded by monitoring the parent XeAr i...

Moderate resolution spectra of the 030 band of NH2 near 6300 Å were recorded in Comet Hale-Bopp near 2.6 and 1.0 AU with the HYDRA array spectrometer on the WIYN telescope. The spectra from beyond the collision sphere were examined with respect to the relative rotational energy distributions in NH2. The relative rotational profiles could be consistently fit at both heliocentric positions by a p...

The origin of the resonant structures in the spectrum of the predissociative part of the A state in the NO-Ar van der Waals cluster has been investigated. We have employed direct excitation to the predissociative part of the NO-Ar A state followed by rotational state selective ionization of the NO fragment. Velocity map imaging of the NO ion yields the recoil energy of the rotational state-sele...