TY - JOUR

T1 - Linear polarizabilities of two- and three-level atoms

AU - Milonni, P.W.

AU - Loudon, Rodney

AU - Berman, P.R.

AU - Barnett, S.M.

PY - 2008/4

Y1 - 2008/4

N2 - Different expressions for the linear polarizability of a two-level atom with radiative corrections have been derived recently. We show that an expression said to differ from that obtained by the present authors is in fact consistent with it. The same-sign and opposite-sign prescriptions for linewidths are revisited with respect to the polarizability, the scattering amplitude, and the optical theorem. Both prescriptions represent approximations to more general expressions in the two-level case, and neither is correct for transitions between excited atomic states, as we demonstrate by calculating the linear polarizability of a three-level atom.

AB - Different expressions for the linear polarizability of a two-level atom with radiative corrections have been derived recently. We show that an expression said to differ from that obtained by the present authors is in fact consistent with it. The same-sign and opposite-sign prescriptions for linewidths are revisited with respect to the polarizability, the scattering amplitude, and the optical theorem. Both prescriptions represent approximations to more general expressions in the two-level case, and neither is correct for transitions between excited atomic states, as we demonstrate by calculating the linear polarizability of a three-level atom.

KW - optical susceptibility

KW - atomic moments

KW - line shape

KW - line width

KW - photon-atom interactions

KW - linear polarizability

KW - radiative correction

UR - http://dx.doi.org/10.1103/PhysRevA.77.043835

U2 - 10.1103/PhysRevA.77.043835

DO - 10.1103/PhysRevA.77.043835

M3 - Article

VL - 77

SP - 043835

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

SN - 1050-2947

IS - 4

ER -