Delayed Fluorescence of Multiphoton CO₂ Laser-Excited Triplet Molecules

Abstract

The paper presents measurements of the luminiscence spectra following the vibrational multiphoton excitation of triplet molecules, and the dependence of both the intensity and decay rates of CO₂ laser-induced delayed fluorescence on the excitation energy and vapor pressure. The data obtained are used for estimation of intermolecular vibrational relaxation rates in the triplet state, the rates of intersystem crossing T₁→S₀ under various levels of vibrational excitation, the average number of absorbed photons per molecules ηand the cross section of vibrational quanta σ in the triplet state quasicontinuum.

Key Words:

• CO₂ laser-induced delayed fluorescence
• triplet molecule
• vapor phase