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We describe the resonant interaction of an atom with a strongly focused lightbeam by expanding the field in multipole waves. For a classical field, or whenthe field is described by a coherent state, we find that both intensity patternand photon statistics of the scattered light are fully determined by a smallset of parameters. One crucial parameter is the overlap of the field with theappropriate dipole wave corresponding to the relevant dipole transition in theatom. We calculate this overlap for a particular set of strongly focusedlongitudinally polarized light beams, whose spot size is only $0.1\lambda^2$,as discussed in S. Quabis, et al., Appl. Phys. B {\bf 72}, 109 (2001).Comment: 8 pages, 3 figure

Atoms, dipole waves, and strongly focused light beams