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

scholarly journals Химический сдвиг и энергия обменного взаимодействия 1s состояний доноров магния в кремнии. Возможность стимулированного излучения

2019 ◽  
Vol 53 (9) ◽  
pp. 1263
Author(s):  
В.Н. Шастин ◽  
Р.Х. Жукавин ◽  
К.А. Ковалевский ◽  
В.В. Цыпленков ◽  
В.В. Румянцев ◽  
...  
Keyword(s):  
Experimental Data ◽  
Population Inversion ◽  
Elevated Temperatures ◽  
Stimulated Raman Scattering ◽  
Stimulated Emission ◽  
Fano Resonances ◽  
Relaxation Rates ◽  
Specific Mechanism ◽  
S States ◽  
Mg Doped

AbstractThe results of experiments aimed at the observation of split 1 s states in Mg-doped Si are reported. From the results, it is possible to determine the chemical shift and exchange interaction energy of a neutral Mg donor in Si. The position of the 1 s ( E ), 1 s ( T _2), and 2 s ( A _1) parastates determines the possibility for attaining population inversion and the specific mechanism of stimulated Raman scattering. The energy of the 1 s ( T _2) parastate is determined from the position of the Fano resonances in the photoconductivity spectrum of Si:Mg at T = 4 K, and the energies of the 1 s ( T _2) and 1 s ( E ) orthostates from the transmittance spectra at elevated temperatures. On the basis of the experimental data, the relaxation rates are estimated, and the possible mechanisms of stimulated emission are analyzed.

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

scholarly journals Benchmark Angle-Differential Cross-Section Ratios for Excitation of the 4p5s Configuration in Krypton

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 61
Author(s):  
Ahmad Sakaamini ◽  
Jean-Baptiste Faure ◽  
Murtadha A. Khakoo ◽  
Oleg I. Zatsarinny ◽  
Klaus Bartschat
Keyword(s):  
Experimental Data ◽  
Differential Cross Section ◽  
Cross Section ◽  
Electron Scattering ◽  
Spin Exchange ◽  
Electronic Excitations ◽  
Close Coupling ◽  
R Matrix ◽  
B Spline

Benchmark intensity ratio measurements of the energy loss lines of krypton for excitation of the 4p61S0→4p55s[3/2]2, 4p55s[3/2]1, 4p55s′[1/2]0, and 4p55s′[1/2]1 transitions are reported, these being the lowest electronic excitations for krypton. The importance of these ratios as stringent tests of theoretical electron scattering models for the noble gases is discussed, as well as the role of spin-exchange and direct processes regarding the angular dependence of these ratios. The experimental data are compared with predictions from fully-relativistic B-spline R-matrix (close-coupling) calculations.

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
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