Titre du document / Document title

Proton-electron mass ratio and the electron's 'atomic mass'

Auteur(s) / Author(s)

VAN DYCK R. S. ; FARNHAM D. L. ; SCHWINBERG P. B. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

Univ. Washington, dep. physics, Seattle WA 98195, ETATS-UNIS

Résumé / Abstract

The UW Penning trap mass spectrometer has been used to improve the values for the electron's atomic mass and the proton-electron mass ratio. The cyclotron frequency of small clouds of ≤ 15 electrons is compared with the cyclotron frequency of a single trapped carbon ion (C⁶⁺) in order to determine their relative mass ratio. In these comparisons, a relatively uniform magnetic field is used in order to assure that each particle sees (on the average) the same field. During systematic studies, the trapping potential was changed by more than a factor of two for the electron. In addition, measurements were taken versus axial and cyclotron drive power as well as the size of the electron cloud. Since the detection mechanism is through the non-harmonic content of the trapping potential, this too was varied. Upon correcting for the lost electrons in carbon, the comparison directly yields M_e = 0.000 548 579 911 7(17) u. Using the accepted value for the proton's atomic mass, we determine m_p/m_e = 1836.152 6646(58). These values are limited primarily by the present stability of the magnetic field

Revue / Journal Title

IEEE transactions on instrumentation and measurement   ISSN 0018-9456   CODEN IEIMAO 

Source / Source

Congrès
CPEM'94 : 1994 conference on precision electromagnetic measurements, Boulder CO , ETATS-UNIS (27/06/1994)
1995, vol. 44, n^o 2 (547 p.)  (9 ref.), [Notes: selected papers], pp. 546-549

Langue / Language

Anglais

Editeur / Publisher

Institute of Electrical and Electronics Engineers, New York, NY, ETATS-UNIS  (1963) (Revue)

Mots-clés anglais / English Keywords

Measuring methods ; Penning trap ; Cyclotron frequency ; Atomic mass ; Electrons ; Fundamental constants ;

Mots-clés français / French Keywords

Méthode mesure ; Piège Penning ; Fréquence cyclotron ; Masse atomique ; Electron ; Constante fondamentale ;

Mots-clés espagnols / Spanish Keywords

Captura Penning ; Masa atómica ;

Localisation / Location

INIST-CNRS, Cote INIST : 222 G1, 35400005642575.1250