ABSTRACrMethods of analyzing vapors in an IMS explosives/narcotics detectr that is primarily designed for particle collection were investigated, with emphasis on nitroglycerin explosive, and &'etic and benzoic acid contaminants in narcotics. A preconcentration step is required because expected vapor concentrations are low. NO adsorption and retention behaviour on conted teflon ifiters that are compatible with the IMS sample desorption system is repMied, including the effects of adsorbent, and sampling flow rate, time and volume. Similar investigations were carried out for acetic and benzoic acid vapors, and a gold-plated nickel mesh was selected as the most appropriate IMS-compatible filter for these materials. Vapor sampling flow rates and volumes are much lower than those used in rticle sampling. Examples of NO and benzoic acid vapor detection in real and simulated applications are discussed.
The vibrational constants of NaF and KF, derived from their infrared spectra, are:[Formula: see text]The vibrational frequencies of RbF and CsF, obtained by extrapolation, are:[Formula: see text]The rotational constant Be and the internuclear distance of KF, previously obtained by molecular beam methods, have been revised slightly as a consequence of the new data.
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