S Mielczarek

Scanning tunneling microscopy applied to optical surfaces

The technique of scanning tunneling microscopy has been applied to topographic mapping of two optical surfaces: a ruled grating replica and a diamond-turned gold mirror. We have demonstrated the ability of the scanning tunneling microscope to measure surface topography of a ruled-grating replica over an area of 2 microm x 2 microm. Furthermore, surface structure on a diamond-turned gold mirror was observed that could not be detected by any other type of surface-sensitive microscope. These measurements yield information necessary for gaining a complete understanding of the diamond-turning process.

Electron impact energy loss spectra of the 12B2 ← X̃2A1 1 transition in N02

Abstract Long vibrational progressions are observed in the electron impact energy loss spectrum of NO2 in the 1.5–4.1 eV energy loss range. These progressions can be assigned to the 12B2← X2A1 transition and suggest that the 12B2 state is asymmetric.

Dependence of generalized oscillator strengths of H2O on momentum transfer

Abstract Experimental results on the dependence of generalized oscillator strengths of water on momentum transfer, showing the appearance of extrema and characteristic features in the electron scattering spectra are reported and discussed.