  We have developed a technique that extends static scanning electron
microscopic imaging to include hyperspectral mapping of fast thermal and
externally-driven movements at up to Megahertz frequencies. It is based on
spectral analysis of the secondary electron flux generated by a focused
electron beam incident on the moving object. We demonstrate detection of
nanowire Brownian motion and hyperspectral mapping of stimulated oscillations
of flea setae with deep sub-nanometer displacement sensitivity.
