Chemistry of the atmosphere by Murray J McEwan

By Murray J McEwan

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They produced the H atoms by passing H 2 gas, R J L D Discharge flow system used by Phillips and Schiff for studies of atom reactions. Gas entering at A is partially dissociated by a discharge inside the microwave cavity M, before flowing down the reaction tube R and out to the pump at P. The stable reactant enters at B, flowing through the flexible tube T to enter the reaction tube through the jet J . The jet J can be moved along the axis of the reaction tube by turning the handle H . Guide tubes G keep it positioned in the centre of the reaction tube.

Normally an accuracy of 20-30 % is claimed for rate constants obtained by the FA method . 33 Complications may arise in connection with numerical values listed for the rates of ion-molecule reactions. The FA system conveniently produces rate constants k in cm 3 particle t s - 1 for a 'bimolecular' process. Mass spectrometer ion source measurements, where the ions have a non­ Maxwellian translational energy distribution, yield cross sections q, which have until recently been expressed in A 2 (the appropriate SI unit would be the nm 2 100 A 2 ) .

A theory to account for the presence of these ion clusters was later proposed by Fehsenfeld and Ferguson6 , as discussed in Chapter 6 . A s anothe r example, Evans e t a/. 27 µm in the dayglow. From the intensity of this emission an estimate of the concentration of Oi(1 Ag) was made, and the result turned out to be unexpectedly large. Subsequently the high concentration of 02( 1 Ag) was used to account for the observed 02 + con­ centration in the D region 8 , by attributing formation of 02 + to photo­ ionization of 02( 1 A8) .

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