Abstract
A systematic measurement of the lifetimes and tensor polarizabilities of the lowest-lying odd-parity levels of Sm I was performed. The lifetimes were measured by detecting time-resolved fluorescence following pulsed-laser excitation of atoms in an atomic beam; polarizabilities were measured employing the method of Stark-induced quantum beats. An analysis of the data is undertaken to find the best even-parity candidate states for an atomic electric dipole moment (EDM) measurement. For the most favorable candidate state ${(}^{7}{G}_{1}),$ the electron EDM enhancement factor is evaluated to be in the range $|R|\ensuremath{\approx}100--3800.$ Critical analysis of the present data along with earlier results in Sm shows the necessity of a term reassignment for several odd-parity states. This term reassignment is also used in an estimate of the parity-nonconserving ${}^{7}{\stackrel{\ensuremath{\rightarrow}}{{F}_{0}}}^{7}{G}_{1}$ amplitude.
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