研究目的
To experimentally observe and compare the bond stretching time of one-photon and net-two-photon dissociation pathways of singly ionized H2 molecules using a polarization-skewed femtosecond laser pulse.
研究成果
The bond stretching times for the one-photon and net-two-photon dissociation pathways of H2 are found to be almost equal. The method provides a robust tool for probing ultrafast molecular dynamics with sub-optical-cycle time resolution.
研究不足
The time resolution is limited by the pulse duration and the sensitivity of the detection system. The method may introduce errors for molecules with longer bond stretching times, such as D2, due to the less sensitive polarization direction at the edges of the laser pulse.
1：Experimental Design and Method Selection:
The experiment uses a polarization-skewed femtosecond laser pulse to ionize H2 molecules and measure the angular distributions of ejected photoelectrons and nuclear fragments in coincidence. The cycle-changing polarization of the laser field acts as a stopwatch to clock the ionization and dissociation times.
2：Sample Selection and Data Sources:
H2 and D2 molecules are used as samples. The data is collected using the COLd Target Reoil Ion Momentum Spectrometer (COLTRIMS) technique, detecting photoelectrons and ions in coincidence.
3：List of Experimental Equipment and Materials:
COLTRIMS, position-sensitive microchannel plate detectors, polarization-skewed femtosecond laser pulse.
4：Experimental Procedures and Operational Workflow:
The laser pulse ionizes H2 molecules, and the resulting photoelectrons and nuclear fragments are detected in coincidence. The angular distributions are analyzed to determine the ionization and dissociation times.
5：Data Analysis Methods:
The angular distributions of photoelectrons and nuclear fragments are analyzed to extract the bond stretching times for the one-photon and net-two-photon pathways.
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