The spectra of conical bubble sonoluminescence in 1,2-propanediol and glycol

摘要

A conical bubble straight tube apparatus was set up to study sonoluminescence. The spectra of conical bubble sonoluminescence for 1,2- propanediol and glycol were detected. The results show that the luminescence is intense, and the spectra consist of a broad background on which five clear sequences of Swan bands and three sequences of the B-2 Sigma(+) -> X-2 Sigma(+) transition of CN are superimposed. A band assigned to the A(2)Delta -> X-2 Pi transition of CH was also measured and the vibrational and rotational structures of Swan bands could be resolved. The origin of the C-2(*) and C2H* is discussed. Finally, the achieved molecular vibrational temperature is estimated to be about 5400 +/- 350 K.