R -matrix-with-time-dependence theory for ultrafast atomic processes in arbitrary light fields

-matrix-with-time-dependence theory for ultrafast atomic processes in arbitrary light fields},
  author={Daniel D. A. Clarke and Gregory S J Armstrong and A. C. Brown and Hugo van der Hart},
  journal={Physical Review A},
We describe an ab initio and nonperturbative $R$-matrix with time-dependence theory for ultrafast atomic processes in light fields of arbitrary polarization. The theory is applicable to complex, multielectron atoms and atomic ions subject to ultrashort (particularly few-femtosecond and attosecond) laser pulses with any given ellipticity, and it generalizes previous time-dependent $R$-matrix techniques restricted to linearly polarized fields. We discuss both the fundamental equations, required… 

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