Abstract
Colloidal suspensions of Na, K, Rb, and Cs have been prepared in diethyl ether. The visible extinction spectra of each are compared with results of theoretical Mie-scattering spectra, calculated using a variety of optical constant data sets. Comparison of the experimental extinction spectra to the theoretical spectra demonstrates that fresh sols of Na, K and Rb contain small metal particles with diameters suitable for surface-enhanced Raman (SER) spectroscopic studies. Fresh Cs colloids, reported for the first time, show signs of particle aggregation in long strings. Raman spectra of Na, K and Rb colloids are presented in the region between 150 and 700 cm −1. We find that Na colloids display two broad SER features at 290 and 530 cm −1, K colloids display two SER features at 220 and 480 cm −1, and Rb colloids display one band at 215 cm −1. The lower-frequency bands for Na and K sols and the 215 cm −1 band of Rb sols may be due to lattice modes of amorphous alkali-metal hydroxides on the metal surfaces. The two higher-frequency bands at 480 and 530 cm −1 remain unassigned.
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