PERFORMANCE-CHARACTERISTICS OF A CHEMICAL IMAGING TIME-OF-FLIGHT MASS-SPECTROMETER

A chemical imaging time-of-flight secondary ion mass spectrometer is d escribed. It consists of a liquid metal ion gun, medium energy resolut ion reflectron mass analyzer, liquid nitrogen cooled sample stage, pre paration chamber and dual stage entry port. Unique features include co mpatibility with laser postionization experiments, large field of view , cryogenic sample handling capability and high incident ion beam curr ent. Instrument performance is illustrated by the characterization of scanning electron microscopy grids, silver and functionalized polystyr ene beads and the postionization of an organic overlayer on a gold sub strate, (C) 1998 John Wiley & Sons, Ltd.