Atomic Masses ofH1,D2,

K. S. Quisenberry

¹

,

T.T. Scolman

²

,

Alfred O. Nier

³

Abstract

The large double-focusing mass spectrometer recently developed has been used to measure a series of 25 mass doublets. This instrument features a new peak-matching method of measurement which involves the presentation of a portion of the mass spectrum upon an oscilloscope. A group of consistency tests has been performed to prove the correctness of the mass dispersion formula used in calculating mass differences.The measured doublets are sufficient to calculate the mass of C 12 by five different cycles and to also calculate the masses of H 1 , D 2 , and S 32 . The resulting mass values are H 1^ 1.0081442±2, D 2 = 2.0147406±6, C 12 =12.0038167±8, and S 32 = 31.9822401 ±9 amu, where the errors shown include the statistical standard error and the resistance calibration uncertainty. A discrepancy exists between the mass values determined here and some of those derived from nuclear reaction energy data.

Structures of three minor alkaloids of Fumariaofficinalis L.

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Новый Масс-Спектрометр Высокой Точности

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