The temperature dependence of electron attachment to N2O in the gas phase

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Abstract
The temperature dependence of electron attachment to N2O has been measured in the gas phase for pure N2O and N2O–C2H6 and N2O–neopentane mixtures. The rate constant found for e−+N2O→N2+O− can be expressed as 2.2×10−7 exp(−5.18×103/T) cm3/molecule⋅sec while that for e− +N2O→N2O−* is 4.2×10−9 exp(−2.65×103/T) cm3/molecule⋅sec. The corresponding activation energies are 0.44 and 0.23 eV. The latter value is discussed by reference to recent calculations on the N2O− energy surface. Formation of N2O−* with such an activation energy seems possible. The temperature dependences of other reactions in the overall mechanism are also determined. Certain rate constants increase with a decrease in temperature. Formation of negative ion complexes is suggested to account for the observation.

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