Abstract
Delayed ionization is found to be absent for sub-picosecond laser excitation of free C60 and C70 at 248 nm. The autocorrelation trace obtained for C +60 in a laser time-of-flight (TOF) mass spectrometer using two time-delayed and collinear 248 nm ultrashort laser pulses has a width of 1.1 ps (715 fs for sech2 pulses), in agreement with the laser pulse duration measurement in NO gas. Both above observations can be explained by direct ionization of C60 via coherent two-photon absorption by the high intensity sub-picosecond 248 nm laser excitation avoiding the channel leading to delayed ionization.
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Zhang, Y., Späth, M., Krätschmer, W. et al. Sub-picosecond laser ionization of free C60 and C70 at 248 nm. Z Phys D - Atoms, Molecules and Clusters 23, 195–196 (1992). https://doi.org/10.1007/BF01437394
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DOI: https://doi.org/10.1007/BF01437394