scholarly journals Spectroscopy and Combustion Theory Hyperfine Structure in Line Spectra and Nuclear Spin

Nature ◽  
1949 ◽  
Vol 163 (4143) ◽  
pp. 466-466
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin ◽  
Combustion Theory

scholarly journals Hyperfine structure in the arc spectrum of cæsium and nuclear rotation

1928 ◽  
Vol 121 (787) ◽  
pp. 432-447 ◽  
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin ◽  
High Frequency ◽  
Principal Series ◽  
Very High Frequency ◽  
Nuclear Rotation ◽  
Higher Temperature ◽  
The Difference ◽  
Mechanical Moment ◽  
Very High

The arc spectrum of cæsium was investigated with the object of finding whether any of its lines possessed hyperfine structure, resulting from a nuclear magnetic moment, due to a quantised nuclear spin. The lines belonging to the principal series should, owing to the greater degree of penetration of the electron in the (1 s or 6 1 ) orbit, and the correspondingly greater interaction, show the greatest effect. The lines of the principal series are very easily broadened if the vapour pressure of the metal becomes high, so that great care had to be used in obtaining the spectrum of cæsium at a sufficiently low temperature. The most satisfactory method of excitation was found to be the application by means of external electrodes of a very high frequency alternating current to a tube filled with helium at about 2 mm. pressure containing a small quantity of cæsium. The tube required slight heating to bring out the cæsium lines; without this the helium spectrum was very much stronger than the metallic spectrum. At a very low vapour pressures of cæsium the discharge was blue in colour. Under these conditions the lines of the principal series showed no broadening greater than that due to thermal agitation, but at a slightly higher temperature the colour of the discharge became purple and the lines broadened. The lines belonging to the principal series were found to be very close doublets with very nearly constant frequencies differences. A theory is worked out which explains the origin of these doublets, assuming a nuclear spin of one half quantum; by correlating the difference in the separation of the hyperfine structure doublets in the 1 s — m 2 p 3/2 lines and the 1 s — m 2 p 1/2 lines, it is shown that a ratio of the magnetic to the mechanical moment of the nucleus about twice as great as the corresponding ratio for the electron would account for the observed frequency differences. The spectral notation used throughout is that of Hund. The results are compared with those found for the hyperfine structure of some of the bismuth lines by Back and Goudsmid, and are found to be in satisfactory agreement. A selection principle is found which applies both to the bismuth and the cæsium spectrum.

scholarly journals Zero- and Nonzero-Nuclear-Spin Isotope Response in Resonantly Enhanced Multiphoton Ionization of Kr nd Xe With Broad Band Lasers

1993 ◽  
Vol 13 (2) ◽  
pp. 159-165
Author(s):  
D. Charalambidis ◽  
Y. L. Shao ◽  
S. D. Moustaizis ◽  
C. Fotakis
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin ◽  
Intermediate State ◽  
Broad Band ◽  
Multiphoton Ionization ◽  
Mass Analysis ◽  
Experimental Conditions ◽  
Broadband Laser ◽  
Photon Ionization ◽  
Ionization Response

The abundance of the 83Kr isotope, determined by ion mass analysis following three photon resonant four photon ionization via the 5s’ [1/2]1 state with a broadband laser is found to differ from the expected natural value. This effect is discussed in terms of a change of the ionization response due to the decay of coherence in the intermediate state to its hyperfine structure coupling. The nonzero nuclear spin isotopes of Xe have not shown any effect of this type in three different ionization schemes under the present experimental conditions.

Nuclear Spin, Hyperfine Structure, and Nuclear Moments of 6.8-Day Lutetium-177

1962 ◽  
Vol 126 (1) ◽  
pp. 252-257 ◽  
Author(s):  
F. Russell Petersen ◽  
Howard A. Shugart
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin ◽  
Nuclear Moments

Nuclear Spin, Hyperfine Structure

1993 ◽  
pp. 337-361
Author(s):  
Hermann Haken ◽  
Hans Christoph Wolf
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin

Nuclear Spin, Hyperfine Structure

1996 ◽  
pp. 347-371
Author(s):  
Hermann Haken ◽  
Hans Christoph Wolf
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin

Nuclear Spin, Hyperfine Structure

1987 ◽  
pp. 335-359
Author(s):  
Hermann Haken ◽  
Hans Christoph Wolf
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin
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