Precision Determination of the Hyperfine Structure of the Ground State of Atomic Hydrogen, Deuterium, and Tritium

1960 ◽  
Vol 4 (2) ◽  
pp. 69-71 ◽  
Author(s):  
L. Wilmer Anderson ◽  
Francis M. Pipkin ◽  
James C. Baird
Keyword(s):  
Hyperfine Structure ◽  
Ground State ◽  
Atomic Hydrogen ◽  
Precision Determination ◽  
Hydrogen Deuterium

Precision determination of the hyperfine-structure interval in the ground state of positronium. V

1984 ◽  
Vol 30 (3) ◽  
pp. 1331-1338 ◽  
Author(s):  
M. W. Ritter ◽  
P. O. Egan ◽  
V. W. Hughes ◽  
K. A. Woodle
Keyword(s):  
Hyperfine Structure ◽  
Ground State ◽  
Precision Determination

Determination of a High Potential Barrier Hindering Internal Rotation from the Ground State Spectrum. The Methylbarrier of Ethylbromide

1985 ◽  
Vol 40 (6) ◽  
pp. 575-587 ◽  
Author(s):  
J. Gripp ◽  
H. Dreizler ◽  
R. Schwarz
Keyword(s):  
Hyperfine Structure ◽  
Internal Rotation ◽  
Potential Barrier ◽  
Ground State ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational Ground State ◽  
Distortion Analysis ◽  
High Potential Barrier

For ethylbromide a determination of the parameters of internal rotation is given derived from the rotational spectrum of the torsional and vibrational ground state. The Br-hyperfine structure is reanalysed with higher precision. As high J transitions were measured a centrifugal distortion analysis was necessary.

On the Determination of Electron Temperature in Diffusion-Dominated Non-L.T.E. Plasmas

1973 ◽  
Vol 28 (8) ◽  
pp. 1289-1293 ◽  
Author(s):  
H. W. Drawin ◽  
F. Emard
Keyword(s):  
Excited States ◽  
Ground State ◽  
Atomic Hydrogen ◽  
Actual Number ◽  
Number Density ◽  
Population Densities ◽  
Characteristic Quantity ◽  
State Densities ◽  
And Diffusion

Population densities of atomic hydrogen levels have been calculated for homogeneous stationary and diffusion-dominated stationary plasmas. The results show strong overpopulation of the lower lying excited states when the actual number density of ground state atoms is larger than the density obtained for the homogeneous stationary state. At low electron and high ground state densities the so-called Boltzmann slope is not further a characteristic quantity for the determination of electron temperatures, since the slope constant changes with quantum number. - The partial L.T.E. condition for diffusion-dominated plasmas is reexamined.

Precise determination of the ground state hyperfine structure splitting of43Ca II

1994 ◽  
Vol 31 (1-2) ◽  
pp. 27-30 ◽  
Author(s):  
F. Arbes ◽  
M. Benzing ◽  
Th. Gudjons ◽  
F. Kurth ◽  
G. Werth
Keyword(s):  
Hyperfine Structure ◽  
Ground State ◽  
Precise Determination ◽  
Structure Splitting

scholarly journals Some possibilities for laboratory searches for variations of fundamental constants

2000 ◽  
Vol 78 (7) ◽  
pp. 639-678 ◽  
Author(s):  
S G Karshenboim
Keyword(s):  
Fine Structure ◽  
Hyperfine Structure ◽  
Magnetic Moment ◽  
Ground State ◽  
Fundamental Constants ◽  
Time And Space ◽  
Advantages And Disadvantages ◽  
Hydrogen Deuterium ◽  
Small Magnetic Moment

We consider different options for the search for possible variations of the fundamental constants. We give a brief overview of the results obtained with several methods. We discuss their advantages and disadvantages with respect to simultaneous variations of all constants in both time and space in the range 108–1010 years. We also suggest a few possibilities for the laboratory search. Particularly, we propose some experiments with the hyperfine structure of hydrogen, deuterium, and ytterbium–171 and of some atoms with a small magnetic moment. Other suggestions are for some measurements of the fine structure associated with the ground state. Special attention is paid to the interpretation of the hfs measurements in terms of variations of the fundamental constants. PACS No.: 31.30G

scholarly journals Precision determination of the ground-state hyperfine splitting of trapped ¹¹³Cd+ ions

2021 ◽  
Author(s):  
Shengnan Miao ◽  
Jianwei Zhang ◽  
Haoran Qin ◽  
Nongchao Xin ◽  
Jize Han ◽  
...  
Keyword(s):  
Ground State ◽  
Hyperfine Splitting ◽  
Precision Determination

Determination of dipole and quadrupole hyperfine structure in the excited B2Σ state of Ca79Br and Ca81Br

1981 ◽  
Vol 59 (10) ◽  
pp. 1308-1312 ◽  
Author(s):  
W. J. Childs ◽  
David R. Cok ◽  
L. S. Goodman
Keyword(s):  
Hyperfine Structure ◽  
Ground State ◽  
Molecular Beam ◽  
Double Resonance ◽  
Beam Laser ◽  
Hyperfine Constants

Recent molecular-beam, laser-rf, double-resonance measurements of the hfs intervals in the X2Σ ground state of CaBr have been supplemented with laser scans of the hfs of sub-Doppler B ↔ X optical lines in a molecular beam to provide greatly improved values for the hfs constants of the excited B2Σ state. The values b = 11.8 ± 0.4 MHz and eqQ = 30.4 ± 1.0 MHz are reported for the hyperfine constants of Ca79Br in its B2Σ2, ν′ = 0 state; c is found to have a magnitude not more than about 10 MHz, and may be negative.

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