IR-REMPI spectroscopy for thermometry of C-60

Gas-phase C-60 molecules are excited with a 30 ps 266 nm Nd:YAG laser, foll owed by a train of high-power infrared (IR) sub-picosecond pulses from a fr ee electron laser (FEL), which resonantly heats the molecules up to interna l energies at which they efficiently undergo delayed ionization. By tuning the IR laser wavelength, IR-REMPI spectra are obtained. These are compared to simulations, giving detailed insight into the influence of UV pre-excita tion on the IR laser ionization process of C-60 molecules. (C) 2000 Elsevie r Science B.V. All rights reserved.