Above-threshold ionization: From classical features to quantum effects

Atoms interacting with intense laser fields can emit electrons and photons of very high energies. An intuitive and quantitative explanation of these highly nonlinear processes can be found in terms of a generalization of classical Newtonian particle trajectories, the so-called quantum orbits. Very few quantum orbits are necessary to reproduce the experimental results. These orbits are clearly identified, thus opening the way for an efficient control as well as previously unknown applications of these processes.

https://science.sciencemag.org/content/sci/292/5518/902.full.pdf

Feynman's Path-Integral Approach for Intense-Laser-Atom Interactions

The hydrogen atom in a uniform magnetic field — An example of chaos

Atomic negative ions: structure, dynamics and collisions

A proton beam radiology system provides cancer treatment and proton radiography. The system includes an accelerator for producing an H - beam and a laser source for generating a laser beam. A photodetachment module is located proximate the periphery of the accelerator. The photodetachment module combines the H - beam and laser beam to produce a neutral beam therefrom within a subsection of the H - beam. The photodetachment module emits the neutral beam along a trajectory defined by the laser beam. The photodetachment module includes a stripping foil which forms a proton beam from the neutral beam. The proton beam is delivered to a conveyance segment which transports the proton beam to a patient treatment station. The photodetachment module further includes a laser scanner which moves the laser beam along a path transverse to the cross-section of the H - beam in order to form the neutral beam in subsections of the H - beam. As the scanning laser moves across the H - beam, it similarly varies the trajectory of the proton beam emitted from the photodetachment module and in turn varies the target location of the proton beam upon the patient. Intensity modulation of the proton beam can also be achieved by controlling the output of the laser.

Method and apparatus for laser-controlled proton beam radiology

A ripplelike structure in the photodetachment cross section of ${\mathrm{H}}^{\mathrm{\ensuremath{-}}}$ near threshold, arising from autocorrelation in the wave function of the photoelectron in the presence of motional electric fields, is observed.

Lillian Overman

Papers

Observation of motional-field-induced ripples in the photodetachment cross section of H-