Abstracts of Bell System Technical Papers* 

 Not Published in this Journal 



Ahearn, a. J./ AND H. B. Hannay^ 



Formative of Negative Ions of Sulfur Hexafluoride, J. Chem. Phys., 

 21, pp. 119-124, Jan., 1953. 



Negative ion production in SFe has been studied in a mass spectrometer; 

 SFe-, SF5-, SF2-, F- were identified. The SFe- and SF5- are produced in very 

 large quantities by a resonance capture process at an electron energy of about 

 2 ev, and are formed in approximately equal amounts. At higher electron 

 energies, the same capture occurs by a secondary process, in which low energy 

 electrons released by other excitation and ionization processes suffer the 

 resonance capture. Partial dissociation after electron capture accounts for 

 the appearance of F- and F2- ions below 16 ev. Above this energy, other proc- 

 esses will also produce these ions. Possible explanations of the primary reson- 

 ance capture mechanism are discussed. 



Anderson, F. B.^ 



Gain and Phase Angle Measuring Set, Elec. Eng., 72, pp. 245, Mar., 

 1953. 



Digest of paper "A 10-Cycle to 10-Megacycle Gain and Phase Angle Measur- 

 ing set." 



Armstrong, C. A.^ 



Communications for Civil Defense, Elec. Eng., 72, pp. 218-222, Mar., 

 1953. 



Beck, A. C, see S. E. Miller. 



* Certain of these papers are available as Bell System Monographs and may be 

 obtained on request to the Publication Department, Bell Telephone Laboratories, 

 Inc., 463 West Street, New York 14, N. Y. For papers available in this form, the 

 monograph number is given in parentheses following the date of publication, and 

 this number should be given in all requests. 



^ Bell Telephone Laboratories, Inc. 



2 American Telephone and Telegraph Company. 



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