IONIZATION POTENTIALS IN DISSOCIATED GASES. 221 



but do not give such decisive information. The above critical poten- 

 atom. The other two curves are consistent with these interpretations. 



9 \0 1/ \Z /3 /4 \5 /6 17 



Fig. 6. 



tials are determined experimentally to within probably 0.2 volt, when 

 the corrections for velocity distribution are considered.^ 



