uppermost atomic layer sensitivity realized under low damage, and how are specific regular surface orientations realized and predicted? Current status HREELS Surface spectroscopic information. To be useful, electron-induced vibrational spectra recorded from polymer surfaces must provide information that will identify the material studied. Dozens of polymers have been analyzed by HREELS, and spectra of simple materials [e.g., polyethylene, polystyrene, and poly(methyl methacrylate)], model compounds such as Langmuir-Blodgett layers, and more complex systems such as poly (ethylene terephthalate), polyimide, and polymer physical mixtures have been published (32). Figure 3 shows the high-resolution spectrum recorded from a clean, fully cured polyimide thin film. The sample was a 200 Â layer deposited by spin coating from a solution onto a gold decorated silicon wafer. Identifying the peaks recorded between 0 and 500 meV (i.e., 0 and 4000 cm - 1 ) required the help of the very large data bank avail-
Wavenumber (cm-1) Figure 3. Electron-induced vibrational spectrum of a clean, cured polyimide surface. Inset shows an IR fingerprint from the same material.
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ANALYTICAL CHEMISTRY, VOL. 62, NO. 11, JUNE 1, 1990 · 651 A
