Geminate recombination processes induced by rare gas collisions with predissociating NaI molecules prepared by femtosecond excitation

Abstract

NaI molecules predissociate after excitation with ultrashort pulses at a peak wavelength of 320 nm. In rare gas environments at higher pressures the process of geminate recombination is likely to occur. We studied the dynamics of these processes under various pressure conditions and for dierent collision partners. The calculations were performed within a three-dimensional statistical model which simulates the NaI wave-packet dynamics with classical trajectories and the collisions via an instantaneous hard-sphere scattering.

Applications of the Karhunen-Loève Decomposition to Quantum Dynamical Problems

“…The predissociation of gas-phase NaI molecules was one of the first processes which was investigated using femtosecond pump/probe spectroscopy [17][18][19]. Transient spectra which monitor the influence of the collisions on the predissociation process were recorded by Materny and co-workers [24] and simulated using a random perturber model by our group [25][26][27]. Suppose now, that the system is embedded in an Ar environment under high pressure.…”