Abstract
We report on optical pumping of Cs atoms implanted in a matrix of solid ${}^{4}$He at 1.6 K. Longitudinal spin relaxation times ${T}_{l}$ of 1--2 s have been measured using the ``relaxation in the dark'' method for magnetic holding fields in the range 0.01--1 G, for which no significant field dependence was found. Zero-field level-crossing resonances in longitudinal and transverse fields (ground-state Hanle effect) and conventional optical-rf double resonance of Cs atoms in solid ${}^{4}$He have been detected.
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