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Controlling intramolecular hydrogen migration by asymmetric laser fields: the water case
Emmanouil Kechaoglou1, Spyridon Kaziannis1, Constantine Kosmidis1
1Department of Physics, University of Ioannina, Ioannina, Gr-45110, Greece. kkosmid@uoi.gr.
Physical Chemistry Chemical Physics : PCCP
|May 18, 2019
Summary
Laser excitation wavelength controls hydrogen and deuterium migration in water dications. Asymmetric laser fields enable control over fragmentation, explained by a tunneling mechanism.
Area of Science:
- Physical Chemistry
- Atomic and Molecular Physics
- Quantum Chemistry
Background:
- Intramolecular migration in water dications is sensitive to excitation conditions.
- Previous studies observed wavelength-dependent fragmentation of H2+ and D2+ ions.
Purpose of the Study:
- Investigate the influence of laser wavelength and field asymmetry on water dication fragmentation.
- Explore the control of dissociation channels using tailored laser fields.
Main Methods:
- Femtosecond (fs) laser irradiation of water dications.
- Single-color laser excitation across a range of wavelengths (800 nm to 1570 nm).
- ω/2ω asymmetric laser field experiments (1400/700 nm) with phase control.
Main Results:
- Hydrogen and deuterium intramolecular migration show distinct wavelength dependencies.
- Fragmentation patterns of H2+ and D2+ ions are influenced by laser parameters.
- Dissociation channels exhibit phase-dependent behavior in asymmetric fields.
Conclusions:
- Laser wavelength and field asymmetry offer precise control over water dication fragmentation.
- A tunneling mechanism is proposed to explain the observed migration and fragmentation phenomena.
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