Abstract
Rate constant are determined for the association of O 2, NH 3, CH 3Cl, CH 3OH, CH 3SH, and CH 3NH 2 to Pb + and for NH 3, CH 3OH, CH 3SH, and CH 3NH 2 to Bi +. The coefficients for Bi + are generally equal to or larger than those for Pb +. The reactions of NH 3, CH 3Cl, and CH 3OH displayed low pressure regime kinetics throughout the pressure range over which the measurements were made (0.2–1.2 Torr He), while CH 3NH 2 showed transition regime behavior. Methyl mercaptan, CH 3SH, showed a combination of low pressure and transition regime behavior with the low pressure rate coefficients for Bi + and Pb + being 2.7×10 −27 and 1.6×10 −27 cm 6 s −1, respectively. Oxygen is found to react extremely slowly ( k 3 0⩽3.2×10 −31 cm 6 s −1) and as such would have a very low probability of being attached to the radon progeny ions Pb + or Bi + in the atmosphere.
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