ИСТИНА

The powerful ultrashort pulses generated by the modern lasers facilities make it possible to study the dynamics of molecular bonds. We previously developed and tested a theoretical model of the Coulomb explosion of water molecules for pulse parameters close to the realized experimentally: photon energy w=1 KeV, duration 20 fs, fluence 2E11 ph/μm**2. In the stimulation, we used the Monte Carlo method to describe transitions between the states of the molecule and its fragments; various processes were taken into account: photoionization, Auger transitions, fluorescence. The motion of the molecular fragments was described by the classical equations of mechanics along the calculated potential energy surfaces. In this research, we explore the effect of radiation beam parameters on the observable quantities. Characteristic features of this effect were revealed, and it was shown that varying the pulse duration keeping the overall fluence allows to deep study the dynamics of molecular bonds.