Ryan R. Cooney
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View article: Ultrabright femtosecond electron sources: perspectives and challenges towards the study of structural dynamics in labile systems
Ultrabright femtosecond electron sources: perspectives and challenges towards the study of structural dynamics in labile systems Open
The advances made in femtosecond electron sources over the last thirty years have been remarkable. In particular, the development of ultrabright femtosecond electron sources has made possible the observation of molecular motion in labile o…
View article: Femtosecond Electron Diffraction Study of the Cyclization Reaction in Crystalline Diarylethene
Femtosecond Electron Diffraction Study of the Cyclization Reaction in Crystalline Diarylethene Open
\nFemtosecond electron diffraction is used to directly resolve the atomic motions involved in the ring closing reaction induced in a photochromic single crystal. The measurements were performed using our newly developed setup capable of de…
View article: Full characterization of RF compressed femtosecond electron pulses using ponderomotive scattering
Full characterization of RF compressed femtosecond electron pulses using ponderomotive scattering Open
High bunch charge, femtosecond, electron pulses were generated using a 95 kV electron gun with an S-band RF rebunching cavity. Laser ponderomotive scattering in a counter-propagating beam geometry is shown to provide high sensitivity with …
View article: State-resolved manipulations of optical gain in semiconductor quantum dots: Size universality, gain tailoring, and surface effects
State-resolved manipulations of optical gain in semiconductor quantum dots: Size universality, gain tailoring, and surface effects Open
Optical gain in strongly confined colloidal semiconductor quantum dots is measured using state resolved pump/probe spectroscopy. Though size tunable optical amplification has been previously reported for these materials, the influence of c…