Abstract
Ionization of organic molecules irradiated with intense infrared femtosecond pulses is explained from the perspective of intact molecular ion formation. Among the excitation parameters affecting ionization and fragmentation processes, excitation pulse durations and excitation wavelengths at a fixed laser intensity have been found to drastically change fragmentation patterns. An ultimately short pulse presumably leads to the formation of fragment-free ions. Those ions are produced when the wavelengths are non-resonant with the electronic levels of the cations. Time-of-flight spectra of femtosecond pulse ionization of cyclohexadiene isomers, 2, 3-dimethyl-1, 3-butadiene, naphthalene, anthracene, and dioxin are presented. Short comments on Coulomb explosion of organic molecules are given. The research subjects of “Reaction in Laser Light Fields Control” in the project of “Control of Molecules in Intense Laser Fields” are briefly reviewed from a point of laser control of chemical reactions.
