ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Resonant two photon ionization (R2PI) spectroscopy was used to obtain detailed spectroscopic information on the neutral and cation ground states of the jet-cooled molecules V2, VNb, and Nb2. By recording photoionization efficiency (PIE) spectra, their adiabatic ionization potentials were determined to be 51 269(5) cm−1 (V2), 51 554(10) cm−1 (VNb), and 51 359(10) cm−1 (Nb2). In VNb, we used different ionization routes to determine that the splitting between the Ω=0 and Ω=1 spin–orbit components of the X 3Σ− ground state was 230(3) cm−1. In the case of V2 and VNb, two thresholds were observed in the PIE spectra recorded via Ω=1 intermediate states. We were thus able to assign the ground states of V+2 and VNb+ as having 4Σ− symmetry, with second-order spin–orbit splittings of 20(3) and 82(3) cm−1, respectively. A simple model was applied to calculate the locations of the 1Σ+ and 2Σ+ states which are responsible for the second-order spin–orbit splitting of the neutral and cation ground states, respectively. One-color R2PI spectroscopy was employed to determine the bond dissociation energy of VNb, the result D00=30 562(10) cm−1 being obtained. The implications of our measurements regarding the relative bond strengths of the neutral and cationic dimers are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.468462
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