Conical bubble sonoluminescence in organic solution

Based on the U-tube, one new type of sonoluminescence apparatus —the conical bubble sonoluminescence straight tube has been set up. Using the apparatus, the ultrabright cavitation luminescence was obtained and the spectra were measured. Results show that the spectra consist in a broad background ranging from the ultraviolet region to the visible region, on which five clear sequences of Swan bands and three sequences of B2Σ+→X2Σ+ transition of CN are superimposed. A band assigned to the A2Δ→X2Π transition of CH has also been measured. Specially, the vibrational structures of Swan bands could be resolved clearly. In addition, the achieved molecular vibrational temperature is estimated to be about 5100±200 K. Finally, the chemical reactions in the sonoluminescence are discussed, which shows the excitence of chemiluminescence in sonoluminescence from organic solution.