This paper proposes a standard set of fault models and establishes acceptable component variations for a new set of benchmark circuits used to evaluate analog and mixedsignal testing techniques.

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It is now generally accepted that more than one mechanism could be at work in enhancing the Raman signal from molecules adsorbed onto a rough surface. In this paper we present a simple surface coverage, surface roughness dependent model that accounts for one such mechanism. According to our model, each adsorbate is subjected to both polarizing and depolarizing fields from its oscillating neighbors. Competition between these two fields is shown to determine the magnitude of signal enhancement.

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Raman spectral results for CO adsorbed at high pressures on Ni(100), Ni(ll0) and Ni(ll1) are presented. The bands near 2020cm-' due to chemisorbed CO are discussed in relation to site of adsorption and surface cleanliness. Raman spectra of temperature and pressure-dependent CO adsorption on Ni( 100) are also presented.