Dynamics of photoreactions in (CF$_3$I)$_n$Xe$_m$ mixed clusters exposed to femtosecond ultraviolet radiation inducing multiphoton ionization

The multiphoton ionization of (CF$_3$I)$_n$Xe$_m$ mixed clusters formed at the outflow of a mixture of CF$_3$I and Xe from an ultrasonic pulsed nozzle by femtosecond ultraviolet radiation ($\lambda= 266$ nm) has been studied. The formation of XeI$^+$ mixed ions and I$_2^+$ ions in intracluster reactions has been detected. It has been shown that the efficiency of the formation of XeI$^+$ ions significantly depends on the duration of a laser pulse: ultraviolet picosecond radiation is necessary for their formation. The kinetic yield curves of the XeI$^+$ and I$_2^+$ ions upon ultraviolet multiphoton ionization of (CF$_3$I)$_n$Xe$_m$ mixed clusters have been measured. The characteristic times of their formation determined from these curves are $(53\pm 8)$ ps and $(65\pm 6)$ ps, respectively.