I. Electron attachment to selected small molecules. II. The development and characterization of a photoionization/electron capture detector for use in gas chromatography systems



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The first part of this work deals with thermal electron attachment to nitrous oxide, oxygen, nitric oxide, nitromethane, nitrobenzene, and a-nitrotoluene. The electron capture detector is utilized to measure the temperature dependence of the capture coefficient. This information is then interpreted on the basis of the mechanism first proposed by Wentworth (12). The results for the six molecules listed above are summarized in the following paragraphs. Thermal electron attachment to nitrous oxide was investigated in the range -66 to 215[degrees]C. The attachment was found to be dissociative in nature with an activation energy of 10.4 [plus-minus] .4 kcal./mole. The activation energy is thought to arise from electron attachment to molecules thermally excited primarily in the bending mode. In an attempt to explain the activation energy a simple Morse function was employed. Potential energy as a function of internuclear distance for both N[lowered 2]O and N[lowered 2]O- was generated at different N[lowered 2]-O bond angles. In this manner a three dimensional surface for the reaction...