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CUOS Noon Seminar: Modeling strong field ionization in diatomic molecules
Dr. Alexandra LandsmanAssociate ProfessorOhio State University
WHERE:
GM Conference Room (4231 LEC)Map
WHEN:
Friday, September 30, 2022 @ 12:00 pm - 1:00 pm
This event is free and open to the publicAdd to Google Calendar
This event is free and open to the publicAdd to Google Calendar
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The Center for Ultrafast Optical Science is pleased to present:
Guest speaker Dr. Alexandra Landsman
Modeling strong field ionization in diatomic molecules
Semiclassical models, such as Strong Field Approximation (SFA) are widely used to investigate strong field ionisation of atoms and molecules and have been instrumental in our understanding of ultrafast laser-matter interaction. Some examples of their application include imaging of molecular orbitals, extracting ionisation delays, and (famously) generation of attosecond pulses from atomic targets via the process of high harmonic generation (HHG).
After a review of some key concepts underlying semiclassical modeling of strong field ionization, I introduce a method to quantify the relative contribution of upfield versus downfield ionization when a diatomic molecule is exposed to intense infrared light. Applying this to previously measured electron momenta distributions following strong field ionization of N2, we find approximately a 2∶1 ratio of electrons ionized from a downfield atom, relative to upfield. This suggests that the bound state wave function largely adapts adiabatically to the changing laser field, although the nonadiabatic process of ionization enhancement still contributes significantly even in neutral molecules.
Pizza will be served free of charge for attendees!