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Conduction electron spin resonance (CESR) has been measured between room temperature and 4 K on small caesium metallic clusters produced in zeolite X. The g value is 1.970 ± 0.005, in reasonable agreement with theory. The signal intensity exhibits a Curie-Weiss temperature dependence because the clusters are so small that quantum size effects are important. However, the latter have a much smaller effect on the g value than the large spinorbit coupling.
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Blazey et al. (1987) studied this question.
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