Abstract
Velocity map imaging has been employed to study multi-photon fragmentation of vanadium monoxide (VO) via the C 4Σ- state. The fragmentation dynamics are interpreted in terms of dissociation at the three-photon level, with the first photon weakly resonant with transitions to vibrational energy levels of the C 4Σ- state. The dissociation channels accessed are shown to depend strongly on the vibrational level via which excitation takes place. Analysis of the evolution of the kinetic energy release spectrum with photon energy leads to a refined value for the dissociation energy of ground state VO of D0(VO) = 53 126 ± 263 cm-1.
Highlights
Vanadium oxides play important roles in modern industrial processes as catalysts, semiconductors, and in optical devices.[1,2] Vanadium monoxide (VO) plays a key role in astrophysical chemistry, with characteristic VO transitions observed in the spectra of both cool (i.e. 2500–3000 K) M-class stars and young hot brown dwarfs and used in their characterisation.[3,4] VO has been postulated to exist in the atmosphere of the large Jupiter exoplanets WASP-121b and WASP-127b discovered by L
We have developed a velocity map imaging (VMI) spectrometer coupled with a laser ablation source capable of investigating the photodissociation dynamics of the small metal oxides
In order to confirm the presence of VO in the molecular beam, the (1 + n) resonance enhanced multiphoton ionization (REMPI) spectrum was recorded in the region of the C 4SÀ (v0)–X 4SÀ (v00 = 0) transitions (Fig. 1a)
Summary
Vanadium oxides play important roles in modern industrial processes as catalysts, semiconductors, and in optical devices.[1,2] Vanadium monoxide (VO) plays a key role in astrophysical chemistry, with characteristic VO transitions observed in the spectra of both cool (i.e. 2500–3000 K) M-class stars and young hot brown dwarfs and used in their characterisation.[3,4] VO has been postulated to exist in the atmosphere of the large Jupiter exoplanets WASP-121b and WASP-127b discovered by L. Due to its astrophysical significance, the low-lying electronic states of VO have been characterised extensively. Many of the same spectral features are clear in the more recent electronic absorption spectra of matrix isolated VO.[16] This group has previous reported resonance enhanced multiphoton ionization (REMPI) spectra of VO in the visible region, characterising transitions from the VO X 4SÀ to the B 4P and C 4SÀ excited states as well as spin-forbidden transitions to the 2 2P and 3 2P excited states.[17] VOxÀ (x = 1–4) anions have been studied by Wang and co-workers using photodetachment spectroscopy,[18] with the high-resolution spectrum of VO2À studied using the low Photoelectron Velocity Map Imaging (SEVI) technique by Neumark and co-workers.[19] McKemmish et al
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