Measurement of the Hydrogen Spin-Exchange Cross Section with the Hydrogen Maser

1968 ◽  
Vol 166 (1) ◽  
pp. 4-6 ◽  
Author(s):  
H. Hellwig
Keyword(s):  
Cross Section ◽  
Spin Exchange ◽  
Hydrogen Maser ◽  
Exchange Cross Section

Stimulated Emission in the Hydrogen Maser and the H Spin-Exchange Cross Section

1973 ◽  
Vol 51 (18) ◽  
pp. 1901-1909 ◽  
Author(s):  
J. Vanier ◽  
R. Brousseau ◽  
R. Larouche
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Spin Exchange ◽  
Analog Computer ◽  
Stimulated Emission ◽  
Rate Equations ◽  
Relaxation Rates ◽  
Hydrogen Maser ◽  
Pulse Technique ◽  
Exchange Cross Section

Experiments are described in which the phenomenon of stimulated emission with a delayed maximum of power is observed in a hydrogen maser and is studied in some detail. The results are coupled to measurements of relaxation rates made through a pulse technique in which the hydrogen beam is modulated. A solution of the rate equations describing the phenomenon for a two-level model is obtained on an analog computer and is compared with the experimental data. From the comparison, we conclude that the phenomenon is explained by the assumed theoretical model. It is found also that the published values of the spin-exchange cross section of hydrogen are consistent with our experimental data.

Measurement of the hydrogen-hydrogen spin exchange cross section

1968 ◽  
Vol 4 (5) ◽  
pp. 327-327
Author(s):  
C. Audoin ◽  
M. Desaintfuscien ◽  
J. Schermann
Keyword(s):  
Cross Section ◽  
Spin Exchange ◽  
Exchange Cross Section

Unexpected reduction of the spin-exchange cross-section for fast $\mathsf{^3He^+}$ ions incident on Rb atoms

2000 ◽  
Vol 8 (3) ◽  
pp. 305-308 ◽  
Author(s):  
Y. Arimoto ◽  
N. Shimakura ◽  
K. Yonehara ◽  
T. Yamagata ◽  
M. Tanaka
Keyword(s):  
Cross Section ◽  
Spin Exchange ◽  
Exchange Cross Section

Electron-potassium spin-exchange cross section

1975 ◽  
Vol 8 (16) ◽  
pp. 2615-2619 ◽  
Author(s):  
A F Oluwole ◽  
H B Olaniyi ◽  
S G Schmelling ◽  
J B Aladekomo
Keyword(s):  
Cross Section ◽  
Spin Exchange ◽  
Exchange Cross Section

Spin-exchange cross section for a3He+ion incident on a Rb atom

2001 ◽  
Vol 64 (6) ◽  
Author(s):  
Y. Arimoto ◽  
N. Shimakura ◽  
T. Yamagata ◽  
K. Yonehara ◽  
M. Tanaka
Keyword(s):  
Cross Section ◽  
Spin Exchange ◽  
Exchange Cross Section

Effects of coherently excited Zeeman transitions on a hydrogen maser hyperfine transition

1979 ◽  
Vol 57 (6) ◽  
pp. 904-916 ◽  
Author(s):  
J.-Y. Savard ◽  
G. Busca ◽  
S. Rovea ◽  
M. Desaintfuscien ◽  
P. Petit
Keyword(s):  
Frequency Shift ◽  
Asymmetry Parameter ◽  
Spin Exchange ◽  
Average Duration ◽  
Low Frequency ◽  
Transition Rates ◽  
Hydrogen Maser ◽  
Hydrogen Atoms ◽  
Zero Crossing ◽  
Exchange Cross Section

The effects of transitions excited within the F = 1 multiplet of the ground state hydrogen atoms while radiating on the ΔmF = 0 transition are analyzed theoretically. The results are valid for low transition rates and unrestricted maser power. The predictions are: (a) an important modification of the well-known spin-exchange frequency shift of a hydrogen maser, due to the imaginary part of the spin-exchange cross section, (b) a frequency shift proportional to the asymmetry parameter between the 2-Zeeman frequencies in the upper multiplet F = 1, and (c) a frequency shift proportional to the polarization of the atoms in the storage bulb.Also shown is a displacement of the zero crossing of the maser detuning vs. the low frequency coherent transition frequency with respect to the dip of the maser absorption. This effect is visible for a maser tuned by spin-exchange and operated at a relatively high magnetic field and nonuniform Zeeman populations.An experimental verification of the theory is presented. A new method for tuning the hydrogen maser is suggested, and a proposal is made to measure the collisional frequency shift proportional to the average duration of hydrogen atom spin-exchange collisions.

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