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We report a new technique to determine the van der Waals coeffcients oflithium (Li) atoms based on the relativistic coupled-cluster theory. Thesequantities are determined using the imaginary parts of the scalar dipole andquadrupole polarizabilities, which are evaluated using the approach that wehave proposed in [1]. Our procedure is fully ab initio, and avoids thesum-over-the-states method. We present the dipole and quadrupolepolarizabilities of many of the low-lying excited states of Li. Also, theoff-diagonal dipole and quadrupole polarizabilites between some of thelow-lying states of Li are calculated.

Ab initio determination of polarizabilities and van der Waals coefficients of Li atoms using the relativistic CCSD(T) method