A5051552339- Laser-Matter Interactions and Applications
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- Insect and Pesticide Research
- Ion-surface interactions and analysis
- Photochemistry and Electron Transfer Studies
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Forensic Fingerprint Detection Methods
Temple University
2022-2024
We compare trajectory-surface-hopping (TSH) calculations of the dissociation quadruply charged formaldehyde molecules with basic classical assuming Coulomb repulsion between singly atoms. The TSH show very different dynamics from calculations, illustrating that point charges does not accurately describe dynamics. By comparing covariance measurements, we see much better agreement experiments and evidence for production multiple electronic states tetracation via strong-field ionization.
We use covariance velocity map imaging of fragment ions from the strong field double ionization formaldehyde in conjunction with trajectory surface hopping calculations to determine yields different singlet and triplet states dication. The calculated kinetic energy release for trajectories initiated on electronic is compared experimental values based momentum resolved measurements. state as a function laser intensity pulse duration down 6 fs (two optical cycles).
Combined theoretical and experimental work examines the dynamics of dication formaldehyde produced by strong field ionization. Trajectory surface hopping on first several singlet electronic states are used to examine relaxation pathways dissociation channels, while kinetic energy distributions after ionization deuterated confirm predictions. We find that excited state is stable, neither decays ground nor dissociates, even though higher lying directly dissociative. The stability explained its...
The dynamics of the dimethyl methylphosphonate (DMMP) radical cation after production by strong field adiabatic ionization have been investigated. Pump-probe experiments using 1300 nm pulses to adiabatically ionize DMMP and a 800 non-ionizing probe induce coherent oscillations parent ion yield with period about 45 fs. yields two fragments, PO2C2H7+ PO2CH4+, oscillate approximately out phase ion, but slight shift relative each other. We use electronic structure theory nonadiabatic surface...
We carry out strong field double ionization measurements of deuterated formaldehyde using covariance velocity map imaging. Comparing our with trajectory surface hopping calculations, we find that produce a surprising distribution dicationic states.