Collisional Deactivation of Vibrationally Highly Excited Azulene in Supercritical Xenon/Ethane Mixtures

摘要

The collisional deactivation of vibrationally highly excited azulene was studied in equimolar supercritical mix- tures of xenon and ethane at 385 K from gas to liquid phase densities. Azulene with an energy of 18000 cm~-1 was generated by laser excitation into the S_1-and subsequent internal conversion to the S~*_σ ground state. The loss of vibrational energy was monitored by transient absorption at the red edge of the S_3→S_0 absorption band at 290 nm. Transient signals were converted into energy-time profiles using hot band absorption coefficients form shock wave experiments for calibration and accounting for solvent shifts of the spectra.