Knowledge Bank

Absorption spectrum of MoO has been obtained in a plasma originated from a pulse electric discharge through mixture of $MoO3$ with $O2$ and Ar or through $Mo(CO)6$. The discharge tube was placed into a cavity of a dye laser. Different sorts of dyes were used to cover spectral region from 550-850 nm. Emission spectrum of the dye laser served as a background were photographed by grating spectrograph with high resolution. The time delay between dye laser and discharge pulses (about 50 ms.) was used to record the MoO spectrum of the best quality. Numerous bands were registered in the absorption spectrum. Four of the more easily discernible open red bands were selected. Three of this bands coincide with the known bands of MoO [1, 2]. By analogy with isovalent molecules (CrO, WO) this bands were assigned to (O-O) bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">5</mrow>}\Pi -X5\Pi$ transition. For the first time the rotational analysis of these bands was performed. Two sets of constants $(cm-1)$ for $\mathrm{<mrow\; data-mjx-texclass="ORD">5</mrow>}\Pi$ state were calculated: $B(1)=0,380,B(2)=0,360$. The constants obtained for $X5\Pi$ state coincide with that in [2]. Analysis of other bands is in progress.