The band spectrum of PO: Two new doublet systems in the ultraviolet

The band spectrum of PO was excited in a high frequency discharge from a 1/2 kW oscillator working at a frequency of 30 to 40 Mc/sec. A new doublet system of bands degraded to red designated asC′?X ² Π _r occuring in the region λ 2200–λ 2900 was observed and analyzed. The following vibrational quantum formula was derived for the inner heads (R ₁ andQ ₂)

$$begin{gathered} v = ^{43854 cdot 5} + 825 cdot 8(upsilon ' + tfrac{1}{2}) - 6 cdot 44(upsilon ' + tfrac{1}{2})^2 hfill ^{43631 cdot 4} - 1232 cdot 6(upsilon '' + tfrac{1}{2}) - 6 cdot 48(upsilon '' + tfrac{1}{2})^2 . hfill end{gathered}$$