A flowing-afterglow Langmuir probe apparatus with mass spectral analys
is has been used to measure the rate constant for electron attachment
to ClONO2 at 300 K. Electron attachment is efficient with a rate const
ant of 1.1 (+/-50%)x10(-7) cm(3) s(-1) and proceeds principally throug
h dissociative channels to produce the major product ions NO2- (simila
r to 50%), NO3- (similar to 30%), and ClO- (similar to 20%). The paren
t ion ClONO2- and Cl- are also observed in the mass spectra but are at
most minor products in the attachment process, less than or equal to
2% and less than or equal to 6%, respectively. A description of the se
condary ion-molecule chemistry that takes place following electron att
achment is given. (C) 1996 American Institute of Physics.