Proton-electron mass ratio from laser spectroscopy of HD+ at the part-per-trillion level
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چکیده
منابع مشابه
Determination of the electron's atomic mass and the proton/electron mass ratio via Penning trap mass spectroscopy.
Accuracy of the electron's atomic mass has been improved tenfold by comparing cyclotron frequencies of electrons and single C + ions alternately confined to the same uniform magnetic field in a Penning trap. Cyclotron resonances are observed via frequency shifts in the particle's continuously monitored harmonic motion parallel to the field. Field instability and relativity cause, respectively, ...
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We have measured with high precision the position of 79 molecular hydrogen absorption lines of Lyman and Werner bands from two absorption systems at zabs = 2.594733 and 3.024899, in the spectra of quasars Q 0405–443 and Q 0347–383, respectively, in order to constrain the cosmological variation of the proton-to-electron mass ratio, μ = mp/me. Data are of the highest spectral resolution (R = 53 0...
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W. UBACHS, R. BUNING, E. J. SALUMBIDES, S. HANNEMANN, H. L. BETHLEM, D. BAILLY, M. VERVLOET, L. KAPER, M. T. MURPHY Laser Centre Vrije Universiteit Amsterdam, The Netherlands Laboratoire de Photophysique Moléculaire, Université de Paris-Sud, Orsay, France Synchrotron Soleil, Gif-sur-Yvette, France Instituut Anton Pannekoek, Universiteit van Amsterdam, The Netherlands Institute of Astronomy, Cam...
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We report a limit on the fractional temporal variation of the proton-to-electron mass ratio as 1/(m(P)/m(e)) partial differential/partial differential(t)(m(P)/m(e))=(-3.8+/-5.6) x 10(-14) yr(-1), obtained by comparing the frequency of a rovibrational transition in SF6 with the fundamental hyperfine transition in Cs. The SF6 transition was accessed using a CO2 laser to interrogate spatial 2-phot...
متن کاملDetermination of the antiproton-to-electron mass ratio by precision laser spectroscopy of pHe+.
A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used to measure 12 transition frequencies of antiprotonic helium to fractional precisions of (9-16)x10(-9). One of these is between two states having microsecond-scale lifetimes hitherto unaccessible to our precision laser spectroscopy method. Comparisons with three-body QED calculations yielded an antiproton-to...
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ژورنال
عنوان ژورنال: Science
سال: 2020
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.aba0453