The R-matrix with time-dependence (RMT) code was developed at Queen's and is a leading method for the solution of problems in attosecond science. Laser-driven electron dynamics evolve on the attosecond timescale, where one attosecond is 10^-18s. We use ARCHER2 to numerically investigate laser-driven electron dynamics. We are interested in how these electron dynamics change when transitioning from the weak laser-field to the strong laser-field regime. To do this we use RMT to investigate how the interaction of a laser-field with helium changes as the laser intensity is increased. We obtain electron spectra which show evidence of new ionization pathways. With RMT we can see how these new pathways are shaped by resonances that are only accessible in strong fields.
Davis et al. (Thu,) studied this question.