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Quantum coherent control of H3 + formation in strong fields
Matthew J Michie1, Nagitha Ekanayake1, Nicholas P Weingartz1
1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USADepartment of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
The Journal of Chemical Physics
|February 3, 2019
Summary
Quantum coherent control (QCC) enhanced H3+ production from methanol using shaped laser pulses. This surprising yield enhancement, exceeding transform-limited pulses, suggests controllable strong-field fragmentation.
Area of Science:
- Physical Chemistry
- Quantum Control
- Strong Field Physics
Background:
- Quantum coherent control (QCC) is established for atomic and molecular excitation.
- Controlling polyatomic fragmentation with shaped laser pulses remains a challenge.
Purpose of the Study:
- To explore QCC using spectral phase functions for controlling H3+ yield from methanol.
- Investigate the effect of single spectral phase steps on molecular fragmentation.
Main Methods:
- Applied single spectral phase steps to femtosecond laser pulses.
- Excited methanol molecules using strong laser fields.
- Measured H3+ and HCO+ fragment yields.
Main Results:
- Observed significant enhancement of H3+ production with specific phase steps.
- Achieved fragment yields exceeding those from transform-limited pulses.
- Demonstrated control over polyatomic fragmentation via shaped pulses.
Conclusions:
- QCC can enhance molecular fragment yield beyond theoretical predictions.
- Shaped pulses offer a controllable method for strong-field polyatomic fragmentation.
- The observed enhancement implies novel underlying strong-field dynamics.
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