scholarly journals Non-spherical proton shape and hydrogen hyperfine splittingThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 773-783 ◽  
Author(s):  
A. J. Buchmann
Keyword(s):  
Charge Distribution ◽  
Hyperfine Splitting ◽  
Spherical Charge ◽  
Atomic Systems ◽  
Absolute Value ◽  
International Conference

We show that the non-spherical charge distribution of the proton manifests itself in hydrogen hyperfine splitting as an increase (in absolute value) of the proton Zemach radius and polarization contributions.

Progress in precise laser spectroscopy of antiprotonic helium atomsThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Masaki Hori
Keyword(s):  
Laser Spectroscopy ◽  
Optical Transition ◽  
Antiprotonic Helium ◽  
Atomic Systems ◽  
International Conference

The ASACUSA collaboration at CERN has previously measured the optical transition frequencies of antiprotonic helium to a precision of <1 part in 108 by laser spectroscopy. We describe some recent theoretical and experimental developmental work carried out by our collaboration to further improve the experimental precision.

Bound states of a uniform spherical charge distribution—revisited!

2000 ◽  
Vol 68 (7) ◽  
pp. 640-648 ◽  
Author(s):  
Brian C. Tiburzi ◽  
Barry R. Holstein
Keyword(s):  
Charge Distribution ◽  
Bound States ◽  
Spherical Charge

The mechanisms of antihydrogen formationThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 785-790
Author(s):  
E. Lodi Rizzini ◽  
L. Venturelli ◽  
N. Zurlo
Keyword(s):  
Preliminary Analysis ◽  
Radiative Capture ◽  
Penning Trap ◽  
Experimental Conditions ◽  
Recombination Mechanism ◽  
Atomic Systems ◽  
International Conference ◽  
Three Body ◽  
Body Recombination

Some years have passed since the report of the first production of cold antihydrogen by the Athena Collaboration and the Atrap Collaboration at CERN, but no clear answer has been given about the roles of the two mechanisms responsible for antihydrogen formation. A new preliminary analysis of the data acquired by the Athena Collaboration in different experimental conditions seems to suggest that three-body recombination mechanism is dominant in the first tens of seconds of the overlapping of the injected antiproton cloud with the positron plasma in the nested Penning trap, while radiative capture starts to become dominant afterwards.

scholarly journals Towards a first observation of magneto-electric directional anisotropy and linear birefringence in gasesThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 159-164 ◽  
Author(s):  
C. Robilliard ◽  
G. Bailly
Keyword(s):  
Recent Progress ◽  
Ring Cavity ◽  
Measurement Procedure ◽  
Linear Birefringence ◽  
Atomic Systems ◽  
International Conference ◽  
Set Up ◽  
Electric Effects ◽  
High Finesse ◽  
Frequency Metrology

In this contribution to PSAS 2010, we report on recent progress on an experiment aimed at measuring small optical directional anisotropies by frequency metrology in a high-finesse ring cavity. We focus on our first experimental goal, the measurement of magneto-electric effects in gases. After a review of the expected effects in our set-up, we present the apparatus and the measurement procedure, showing that we already have the necessary sensitivity to start novel experiments.

The two-photon approximation for the four-photon decay of the 4d excited state in hydrogenThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 123-127 ◽  
Author(s):  
D. Solovyev ◽  
L. Labzowsky
Keyword(s):  
Excited State ◽  
Hydrogen Atom ◽  
Early Universe ◽  
Recombination Process ◽  
Atomic Systems ◽  
International Conference ◽  
Two Photon ◽  
Photon Decay ◽  
Hydrogen Recombination ◽  
History Of

The method of two-photon approximation for multiphoton decay is applied to the decay of the 4d state in the hydrogen atom. In the process of four-photon decay the two-photon contribution that leads to radiation escape, from the interaction with matter, is considered. This may be helpful for a strict description of the recombination process in the hydrogen atom and, in principle, for the history of hydrogen recombination in the early universe.

The E2 admixtures in mixed multipole lines 459.7 and 564.0 nm of Bi IThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 851-856 ◽  
Author(s):  
S. Werbowy ◽  
J. Kwela
Keyword(s):  
Interference Effect ◽  
Computer Modelling ◽  
Electric Quadrupole ◽  
Atomic Systems ◽  
International Conference ◽  
Modelling Techniques

Studies of the M1-E2 interference effect in the Zeeman spectra of forbidden lines 459.7 and 564.0 nm of Bi I are reported. By the use of computer modelling techniques, the simulated contours were fitted to the recorded spectra to determine the electric-quadrupole admixture in forbidden lines. The E2 admixtures found are: (3.49 ± 0.35)% and (37.1 ± 1.8)% for 459.7 and 564.0 nm lines, respectively. Our results are compared with recent theories and other experiments.

On the Coulomb scattering by a spherical charge distribution

1960 ◽  
Vol 18 (3) ◽  
pp. 570-579
Author(s):  
L. Favella ◽  
E. Predazzi
Keyword(s):  
Charge Distribution ◽  
Coulomb Scattering ◽  
Spherical Charge

The vacuum magnetic birefringence experiment: a test for quantum electrodynamicsThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 153-158 ◽  
Author(s):  
P. Berceau ◽  
R. Battesti ◽  
M. Fouché ◽  
C. Rizzo
Keyword(s):  
Experimental Data ◽  
Quantum Electrodynamics ◽  
Atomic Systems ◽  
International Conference ◽  
Magnetic Birefringence ◽  
The Status ◽  
Different Gases

In this contribution to PSAS 2010 we describe the status of the BMV experiment whose goal is to measure the vacuum magnetic birefringence that would represent a pure test for quantum electrodynamics. We present our latest experimental data obtained from Cotton–Mouton measurements of different gases.

A new trap loading mechanism for hydrogenThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 799-806 ◽  
Author(s):  
P. Crivelli ◽  
C. L. Cesar ◽  
R. Lambo
Keyword(s):  
Trap Depth ◽  
Superconducting Magnet ◽  
Low Energy ◽  
Cryogenic Temperatures ◽  
Energy Fraction ◽  
Atomic Systems ◽  
International Conference ◽  
Preliminary Results ◽  
The Matrix ◽  
Paramagnetic Atoms

In this paper, we report on our recent advances on a new trap loading mechanism for neutral atoms. The idea is based on our recently published results for chromium spectroscopy of atoms released from a solid neon matrix at cryogenic temperatures. The proposed trap loading mechanism consists of magnetically capturing the low-energy fraction of paramagnetic atoms being released from the matrix, while the host Ne atoms stick to the walls. Two different designs are described: one with a superconducting magnet producing a trap depth of 3 T and another with a superconducting dynamically switched magnet that generates a trap depth of about 1 T. Some preliminary results are presented.

scholarly journals Universality of leading relativistic corrections to bound state gyromagnetic ratiosThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 117-122 ◽  
Author(s):  
Michael I. Eides ◽  
Timothy J.S. Martin
Keyword(s):  
Free Particle ◽  
Bound State ◽  
Arbitrary Spin ◽  
Atomic Systems ◽  
International Conference ◽  
Relativistic Corrections ◽  
Physical Reasons ◽  
G Factors

We discuss the leading relativistic (nonrecoil and recoil) corrections to bound state g-factors of particles with arbitrary spin. These corrections are universal for any spin and depend only on the free particle gyromagnetic ratios. We explain the physical reasons behind this universality.

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