Abstract
A double - pulse sequence of femtosecond laser pulse (100 fs, 616 nm) is used to pump and control the vibrational wave packet on the B state of the molecular iodine. The control delay, time delay between pump and control pulses, is tuned with about 10 attoseconds accuracy to form a phase - sensed vibrational wave packet on the B state. Time evolution of the wave packet is monitored by a probe pulse (100 fs, 389 nm) with a variable delay time, probe delay. The probe pulse transfers partially the wave packet amplitude on the B to the E state to give fluorescence signals. The pump a nd control evolution of the B state wave packet is demonstrated in real time for the control delay tuned to ~ 2 times or 1.5 times the vibrational recurrence time. Model calculations of the wave packet evolution are performed to understand the observed real-time interference of the wave packets.
© 2004 Optical Society of America
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