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Weak-field, multiple-cycle carrier envelope phase effects in laser excitation
Klaus Renziehausen1, Kilian Hader, Werner Jakubetz
1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Emil-Fischer-Str. 42, 97074 Würzburg, Germany.
Summary
The carrier envelope phase (CEP) of laser pulses influences molecular fragmentation even for longer pulses. This study shows CEP-dependent electron localization in diatomic molecules, removing previous pulse duration limitations.
Area of Science:
- Quantum Chemistry
- Laser Physics
- Molecular Dynamics
Background:
- The carrier envelope phase (CEP) of laser pulses is crucial for controlling ultrafast electron dynamics.
- Previous research often limited CEP effects to ultrashort or ultrastrong laser pulses.
- Understanding CEP effects in broader laser regimes is essential for advanced molecular control.
Purpose of the Study:
- To investigate the influence of the carrier envelope phase (CEP) on molecular fragmentation beyond traditional limitations.
- To explore CEP-dependent electron localization in a model diatomic molecular system.
- To demonstrate the removal of limitations on CEP effectiveness regarding pulse duration and intensity.
Main Methods:
- Theoretical study of a model positively charged homonuclear diatomic molecule.
- Coupling of four electronic states by a laser field.
- Preparation of nuclear wave packets in dissociative states.
- Interaction with a weak pulse to induce CEP-dependent effects.
Main Results:
- Demonstrated that carrier envelope phase (CEP) effects are not limited to ultrashort/ultrastrong pulses.
- Observed CEP-dependent asymmetries in electron density localization.
- Successfully prepared localized electron density on specific fragmentation products.
Conclusions:
- Carrier envelope phase (CEP) control is achievable for molecular processes beyond conventional pulse limitations.
- CEP-dependent electron localization offers a pathway for controlling fragmentation products.
- This work expands the applicability of CEP in laser-matter interactions.
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