Femtosecond photon echo measurements of electronic coherence relaxation between the X(1Σg+) and B(3Π0u+) states of I2 in the presence of He, Ar, N2, O2, C3H8
Matthew Comstock, Vadim V. Lozovoy, Marcos M. Dantus
Photon echo and reverse transient grating measurements of the loss of electronic coherence for molecular iodine are presented. Systematic measurements of the coherence decay rate were made as a function of buffer gas. From the dependence of decay rate on numerical density, we calculated experimental cross sections of decoherence. These values range from 135 Å2 for helium to 1170 Å2 for I2. We find Lennard-Jones parameters for the long-range interactions responsible for decoherence which can be modeled by dispersion forces.
The Journal of Chemical Physics•Sep 18, 2003•13 citations