Nonthermal Intramolecular Vibrational Energy Distribution in Infrared-Multiphoton-Excited CF2Cl2

摘要

The intramolecular vibrational energy distribution of infrared-multiphoton-excited CF2C12 molecules is studied with time-resolved spontaneous Raman scattering. The time evolution of the signals from three vibrational modes is studied up to 600 ns after excitation, and in the presence of N2 buffer gas. Following collisionless infrared multiphoton excitation a nonthermal distribution of vibrational energy is observed. This nonequilibrium distribution persists up to high levels of vibrational excitation, with at least 10 000/cm in three out of the nine vibrational modes. Reprints. (JHD)