Detection of Resonant Collisional Radiative Transfer of the Vibrational Energy between Molecules Subjected to Infrared Laser Multiphoton Excitation in a Two-Component Medium

Abstract

Resonant collisional radiative transfer of the vibrational energy between molecules subjected to infrared laser multiphoton excitation in a two-component medium has been studied. Experiments have been carried out with BCl₃ molecules of the natural isotopic composition in a mixture with CH₃F molecules, which are optically active sensitizers and acceptors of radicals. Both types of molecules resonantly absorb laser radiation. Resonant collisional radiative energy transfer from CH₃F molecules to ¹⁰BCl₃ ones has been observed. It has been shown that this process significantly increases the dissociation yield of ¹⁰BCl₃ and ¹¹BCl₃ molecules compared to the dissociation yield with neutral acceptors of radicals. Dependences of the dissociation yields of BCl₃ molecules on the pump laser frequency have demonstrated a structure that closely correlates with the structure of the infrared absorption spectrum of CH₃F molecules. The method has been described and the experimental results have been reported. Conditions for efficient resonant collisional radiative transfer of the vibrational energy between molecules subjected to infrared laser multiphoton excitation have been discussed.