An empirical spectroscopic model for eleven electronic states of VO

Vanadium monoxide ( V O) is believed to play an important role in the atmospheres of hot-Jupiters, but high-resolution studies have so far failed to detect it, at least in part because of the inaccuracy of available lists. It is likely that the large hyperfine splittings in the spectra of VO, arising from the large nuclear spin of the V atom, has contributed to the non-detections with the current hyperfine-unresolved VOMYT line list. To aid in the production of a new line list, a fully hyperfine-resolved spectroscopic model has been constructed which includes 15 low-lying electronic states (6 quartets and 9 doublets) of VO with the inclusion of hyperfine couplings based on use of the new, hyperfine-resolved version of the diatomic variational nuclear motion programme Duo . The new spectroscopic model is refined against empirical Marvel energies derived from experimental transitions, and hyperfine couplings are fit for the 3 electronic states for which hyperfine effects have been resolved in lab spectra. This model is used to assign some previously identified perturbations.

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ExoMol line lists – LV: hyperfine-resolved molecular line list for vanadium monoxide (51V16O)

Bowesman,

Qu,

McKemmish

et al. 2024

Monthly Notices of the Royal Astronomical Society

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The new hyperfine-resolved HyVO line lists for vanadium monoxide (51V16O) is presented. The new line list considers 15 electronic states and comprises almost 59 billion transitions between 3.4 million energy levels, up to 45 000 cm−1. Empirical energy levels obtained through the Marvel procedure are used to update calculated values to experimental accuracy, making the line list well suited for high-resolution experiments. Machine learning is utilised to refine the energies of levels in important bands, where empirical values are not known. These updates allow for the accurate prediction of line positions in regions of astrophysical interest, particularly in strong rovibronic bands in the infrared and visible. Previously published ab initio transition dipole moment curves are adjusted based on experimental lifetime measurements, resulting in increased intensities in key regions. The line list covers levels up to F = 150 and is complete up to 5 400 K, making it well suited for studies of ultra-hot Jupiter and M-type stellar atmospheres where VO is believed to be a strong source of opacities. The full line list is made available via www.exomol.com.

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An empirical spectroscopic model for eleven electronic states of VO

Cited by 4 publications

References 45 publications

Ro-Vibrational Spectrum of Vanadium Monoxide (VO) at 10 μm

Ro-Vibrational Spectrum of Vanadium Monoxide (VO) at 10 μm

A hyperfine-resolved spectroscopic model for vanadium monoxide ( ⁵¹ V ¹⁶ O)

ExoMol line lists – LV: hyperfine-resolved molecular line list for vanadium monoxide (51V16O)

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An empirical spectroscopic model for eleven electronic states of VO

Cited by 4 publications

References 45 publications

Ro-Vibrational Spectrum of Vanadium Monoxide (VO) at 10 μm

Ro-Vibrational Spectrum of Vanadium Monoxide (VO) at 10 μm

A hyperfine-resolved spectroscopic model for vanadium monoxide ( 51 V 16 O)

ExoMol line lists – LV: hyperfine-resolved molecular line list for vanadium monoxide (51V16O)

Contact Info

Product

Resources

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A hyperfine-resolved spectroscopic model for vanadium monoxide ( ⁵¹ V ¹⁶ O)