ABSORPTION-SPECTRA OF DIATOMIC MOLYBDENUM NITRIDE (MON), MOLYBDENUM OXIDE (MOO), AND MOLYBDENUM DIMER (MO2) MOLECULES ISOLATED IN AR, NE, AND KR MATRICES

MoN and MoO molecules produced in a hollow cathode discharge have been trapped in Ne, Ar, and Kr matrices at 4.2 and 13 K and investigated by optical spectroscopy. Bands attributed to MoN were identified in the red and blue spectral regions and assigned by comparison with gas phase results to the A4π → X4Σ- (a) and B4Σ → X4Σ- (a) transitions, respectively. The ground state of Mo14N has been identified as 4Σ- with ωe = 1040 cm-1 in an Ar matrix. Absorptions assigned to MoO in the red spectral region form the (0-0) and (1-0) bands of at least one electronic transition, but could not definitely be correlated with the gas phase results. The ground state vibrational frequency for Mo16O in an Ar matrix is 893.5 cm-1. Additionally, Mo2 absorptions centered at 19 305 cm-1 were shown to be part of a vibrational progression with an average spacing of 181 cm-1. © 1979.