Abstract
Photoionization cross-sections and dynamic polarizabilities in the normal dispersion region, are calculated using a discrete basis set to represent both the bound and the continuum states. This discrete-basis-set representation is used to construct an approximation to the dynamic polarizability which, in turn, is used in an analytical continuation procedure for complex values of the frequency, using Padé approximants. Since the “complex” dynamic polarizability contains both the absorptive and dispersive information about the system, photoionization cross-sections and dynamic polarizabilities can be obtained simultaneously. This “discretization” of the continuum makes the method potentially applicable to larger systems.
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