A stu dy of the appea rance potentia ls and isotope abundance of tbe rare gases has been made a Consolidated E ngin ee ring Corp. mass sp ectrometer as a check on the operation of th e instrument.The res ults a re comparable to previously publi s hed data.In a dd ition, some nell' experimental value of ionization poten tials have bee n obtained.Generally, good agreement of the isotope ab undance m ea surem en ts with previously published values obtain ed on other types of in strume nts and with chemica]]y determined atom ic weights, indicates a minimum of discri m ination effec ts.The relati ve yalues of th e ion current s for the rare gases we re obtai lled and p.lotted against th e atomic n um bel'.K 0 simple relation betwcen sen sitidty and atom ic Humber is evident.
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Dibeler et al. (1947) studied this question.