ExoMol line lists XVIII. The high temperature spectrum of VO

TL;DR

This paper presents VOMYT, an extensive and accurate high-temperature VO line list with over 277 million transitions, improving infrared absorption data for astrophysical applications.

Contribution

The creation of the VOMYT line list, combining ab initio calculations and experimental data, covering 13 electronic states of VO for the first time at this scale.

Findings

Contains over 277 million transitions

Provides significantly improved infrared absorption data

Covers wavelengths longer than 0.29 μm

Abstract

An accurate line list, VOMYT, of spectroscopic transitions is presented for hot VO. The 13 lowest electronic states are considered. Curves and couplings are based on initial {\it ab initio} electronic structure calculations and then tuned using available experimental data. Dipole moment curves, used to obtain transition intensities, are computed using high levels of theory (e.g. MRCI/aug-cc-pVQZ using state-specific or minimal-state CAS for dipole moments). This line list contains over 277 million transitions between almost 640,000 energy levels. It covers the wavelengths longer than 0.29 $\mu$m and includes all transitions from energy levels within the lowest nine electronic states which have energies less than 20,000 \cm{} to upper states within the lowest 13 electronic states which have energies below 50,000 \cm{}. The line lists give significantly increased absorption at infrared wavelengths compared to currently available VO line lists. The full line lists is made available in electronic form via the CDS database and at www.exomol.com.