Linelists (lists of wavelengths with corresponding intensities) for the diatomic molecules of MnH, MnCl and MnF have been created using the ExoMol methodology (http://exomol.com/) with the latter two created by undergraduate students, who are current 3rd years at Aberystwyth University.

At present, to the best of our knowledge, there are no lineslists in the literature for these molecules: hence this work opens up the possibility of detection of these molecules in space. It has been speculated that MnH could exist in the ISM and, coupled with the favourable abundance of manganese this acts as motivation for this work.

This linelist created for MnH consists of 10 low-lying electronic states. Using the available experimental data for the A-X system, the Potential Energy Curves (PECs) of the X and A states were refined to an accuracy of around 0.5 cm$^{-1}$. The experimentally derived term values presented by Balfour (1990, 1992) for the a, b, c, d and e states were processed and used in the final linelist.

Our linelist has a coverage in $J$ up to 50 which we showed to be more than adequate for temperatures up to 3000~K and a wavelength range extending from around 0.3 to 10 microns.

For MnCl and MnF, linelists covering the first 8 electronic states have been created. At present these are purely theoretical: future work will be to refine where possible to available experimental data which has been gathered.

References
J. Tennyson, S. N. Yurchenko, A. F. Al-Refaie, E. J. Barton, K. L. Chubb, P. A. Coles, S. Diamantopoulou, M. N. Gorman, C. Hill, A. Z. Lam, L. Lodi, L. K. McKemmish, Y. Na, A. Owens, O. L. Polyansky, C. Sousa-Silva, D. S. Underwood, A. Yachmenev, E. Zak, "The ExoMol database: molecular line lists for exoplanet and other hot atmospheres", Journal of Molecular Spectroscopy 327, 73-94 (2016)

J. Tennyson, S. N. Yurchenko, "ExoMol: molecular line lists for exoplanet and other atmospheres", Monthly Notices of the Royal Astronomical Society 425, 21-33 (2012)

D. T. Halfen, L. M. Ziurys, “The Submillimeter Spectrum of MnH and MnD”, The Astrophysical Journal Letters, 672, L77 (2008)