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A more fine-tuned method for probing planet-forming regions, such asprotoplanetary discs, could be rovibrational molecular spectroscopy observationof particular premineral molecules instead of more common but ultimately lessrelated volatile organic compounds. Planets are created when grains aggregate,but how molecules form grains is an ongoing topic of discussion in astrophysicsand planetary science. Using the spectroscopic data of molecules specificallyinvolved in mineral formation could help to map regions where planet formationis believed to be occurring in order to examine the interplay between gas anddust. Four atoms are frequently associated with planetary formation: Fe, Si,Mg, and O. Magnesium, in particular, has been shown to be in higher relativeabundance in planet-hosting stars. Magnesium oxide crystals comprise themineral periclase making it the chemically simplest magnesium-bearing mineraland a natural choice for analysis. The monomer, dimer, and trimer forms of(MgO)_n with n = 1 - 3 are analyzed in this work using high-level quantumchemical computations known to produce accurate results. Strong vibrationaltransitions at 12.5 {\mu}m, 15.0 {\mu}m, and 16.5 {\mu}m are indicative ofmagnesium oxide monomer, dimer, and trimer making these wavelengths ofparticular interest for the observation of protoplanetary discs and evenpotentially planet-forming regions around stars. If such transitions areobserved in emission from the accretion discs or absorptions from stellarspectra, the beginning stages of mineral and, subsequently, rocky bodyformation could be indicated.

Gas-Phase Spectra of MgO Molecules: A Possible Connection from Gas-Phase Molecules to Planet Formation