Study on photodynamics of furan via strong field multiphoton ionization by velocity map imaging technique

The photodissociation dynamics of furan at 800 nm was studied using velocity map imaging technology coupled with time-of-flight mass spectrometry. Dissociation channels are obtained by analysis of furan multiphoton ionization dissociation under strong field. According to time-of-flight mass spectrometry experiments, C4H4O+, C3H3+, C3H4+, C2H2O+, HCO+ are obtained by multiphoton ionization dissociation of furan. By calculating the speed distribution and kinetic energy distribution using velocity map imaging technology, it can be seen that there are two channels of high energy channel and low energy channel in the process of photodissociation. The anisotropy parameters of furan dissociation for both channels are close to 0 (Isotropy) by analysis of the angular distribution of dissociated fragment ions. The density functional theory was employed to calculate the configuration change of the furan molecule before and after ionization, the energy level intensity of the ionic states and corresponding oscillator strength.