Highly nonthermal intramolecular energy distribution in isolated infrared multiphoton excited CF2Cl2 molecules

Citation:

J. Wang, K. Hsien Chen, and E. Mazur. 1987. “Highly nonthermal intramolecular energy distribution in isolated infrared multiphoton excited CF2Cl2 molecules.” In Laser Spectroscopy VIII, edited by S. Svanberg, Pp. 236–238. Springer-Verlag. Publisher's Version

Abstract:

When a polyatomic molecule with a strong vibrational absorption band is irradiated with an intense resonant infrared laser pulse it can absorb many (10 to 40) infrared photons. If some initial energy deposition is localizedpreferably in one vibrational mode or in a subset of modesit may become possible to induce mode-selective reactions by infrared multiphoton excitation. The intramolecular dynamics of infrared multiphoton excited molecules has been studied by a variety of spectroscopic techniques. One of these techniques is spontaneous Raman spectroscopy. In the past five years this technique has been successfully applied to monitor the vibrational energy in infrared multiphoton excited molecules. In this work we present experimental results of recent time-resolved spontaneous Raman experiments on collisionless infrared multiphoton excited CF2Cl2 molecules. The experiments show that the intramolecular energy distribution is highly nonthermal, and that a large part of the vibrational energy remains localized in the pump mode for a period of time long compared to the mean free time of the molecules.
Last updated on 07/24/2019