Preferential Solvation in the Collisional Deactivation of Vibrationally Highly Excited Azulene in Supercritical Xenon/Ethane Mixtures
Preferential Solvation in the Collisional Deactivation of Vibrationally Highly Excited Azulene in Supercritical Xenon/Ethane Mixtures
复制标题
超临界氙/乙烷混合物中振动高激发甘菊环碰撞失活的优先溶剂化
DOI：
10.1021/jp9732266
复制
发表时间：
1998
影响因子：
2.9
通讯作者：
M. Zerezke
中科院分区：
文献类型：
--
作者：
D. Schwarzer;J. Troe;M. Zerezke
The collisional deactivation of vibrationally highly excited azulene was studied in equimolar supercritical mixtures of xenon and ethane at 385 K from gas- to liquid-phase densities. Azulene with an energy of ∼20 000 cm-1 was generated by laser excitation into the S1 state and subsequent internal conversion to the S0* ground state. The loss of vibrational energy was monitored by transient absorption at the red edge of the S3 ← S0 absorption band at 290 nm. Transient signals were converted into energy−time profiles using hot band absorption coefficients from shock wave experiments for calibration and accounting for solvent shifts of the spectra. Under all conditions, the energy decays were exponential. At densities below 1 mol/L, the observed collisional deactivation rate constants kc of the mixture were equal to the sum of the individual contributions of ethane and xenon collisions as expected from simple gas kinetics. At mixture densities above 2 mol/L, kc is smaller than the deactivation rate constant f...
