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Professor Pitzer (University of California) : I was not entirely clear as to 

 just the sort of low frequency terms that you had in mind. Are these molecular 

 vibrations, that is, ordinary molecular vibration terms? 



Professor Jehle: Low frecjuency oscillators, i.e. oscillators whose frequen- 

 cies lie in the infrared, and charge fluctuations whose relaxation times cor- 

 respond to very low frequencies, play a role in specific London interactions 



