The kinetic energy distribution of D+ ions resulting from the interaction of a femtosecond laser pulse with D-2 molecules is calculated based on the rescattering model. From analyzing the molecular dynamics, it is shown that the recollision time between the ionized electron and the D-2(+) ion can be read from the D+ kinetic energy peaks to attosecond accuracy. We further suggest that a more precise reading of the clock can be achieved by using shorter fs laser pulses (about 15 fs). References: 16
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