Abstract
Multibubble sonoluminescence spectra were recorded in the 300–350 nm wavelength range in the case of H
2O/Ar, D
2O/Ar and H
2O/Kr solutions (acoustic frequency: 20 kHz; spectral resolution optimized to 0.34 nm). Three groups of rotational components (R
1/R
2, Q
1/Q
2 and P
1/P
2) were identified in the OH/D A
2
Σ
+
–X
2
Π
i
(0,0) transitions via the substitution of H
2O for D
2O. The congestion of bands and the origin of a red shading extending up to 350 nm are broached.