Abstract
In this article, the high-pressure optical cells used for measurements of the non-linear laser spectroscopic methods under supercritical conditions are described in details. The high-pressure optical cells with a large angle aperture have been developed for the transient grating measurement and resonance Raman measurement in supercritical water. The study on the vibrational energy relaxation of the ground-state azulene molecule in supercritical fluids by the acoustic signal of the transient grating measurement is described in detail. The study revealed that the V-V energy transfer from the photo-excited azulene molecule to the solvent ethane molecules plays an important role in the energy transfer. The results on measurements of the resonance Raman spectra of p-nitroaniline and N,N-dimethyl-p-nitroaniline are also presented.
