Reactions induced in (CF_3I)_n clusters by femtosecond UV laser pulses

摘要

The excitation and ionization of CF_3I molecules and their clusters by femtosecond UV laser pulses is studied. It is concluded that the types of excitation of free CF_3I molecules and their clusters by femtosecond UV laser pulses are different. The composition and kinetic energy of ion products observed upon the ionization of (CF_3I)n clusters by femtosecond pulses are found to differ considerably from those obtained upon ionization by nanosecond pulses. It is shown that the molecular I _2~+ ion is produced in reactions induced in (CF _3I)_n clusters by UV radiation. Using the pump-probe method, we found the two channels of producing I _2~+ ions with characteristic times τ_1 ≈ 1 ps and τ_1 ≈ 7 ps. A model of the reactions under study proposed in the paper is consistent with our experimental results.