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Multiply charged C60q+, q<6, is observed in the multiphoton ionization of C60 with 790 nm, 25 fs pulses. Determination of the laser intensity dependence of the ion intensities indicates that the multiple ionization occurs predominantly sequentially. Coupling of the electronic excitation energy to vibrational degrees of freedom occurs in competition with further ionization.
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Campbell et al. (2001) studied this question.
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