Early stimulated emission amplification by an inverted nuclear spin population and the H-maser

2005 ◽  
Vol 52 (12) ◽  
pp. 1647-1651 ◽  
Author(s):  
Norman F. Ramsey *
Keyword(s):  
Nuclear Spin ◽  
Stimulated Emission ◽  
Spin Population

scholarly journals Influence of Giant Nuclear-spin Polarisation on Resonant Gamma-ray Absorption and Emission

1998 ◽  
Vol 51 (2) ◽  
pp. 339
Author(s):  
R. N. Shakhmuratov
Keyword(s):  
Excited State ◽  
Nuclear Spin ◽  
Ground State ◽  
Gamma Ray ◽  
Stimulated Emission ◽  
Laser Pumping ◽  
Nuclear Excited State ◽  
Spin Polarisation ◽  
Subsequent Quenching ◽  
Amplification Without Inversion

We propose a new scheme of gamma-quanta amplification without inversion. Laser pumping of electron states creates giant nuclear-spin polarisation via the hyperfine interaction. This results in extreme cooling of the ground-state nuclear spin in a projection which does not absorb both laser pump and gamma-quanta according to selection rules for these transitions. Induced emission from the nuclear excited state is not influenced by the pump. Therefore gamma-quanta travelling inside the pump beam have an opportunity to induce stimulated emission without subsequent quenching by ground state nuclei.

Delayed Double Resonance Between Quadrupolar Levels: Observation of a Nuclear Spin Emission Signal in s-Triazine

1986 ◽  
Vol 41 (1-2) ◽  
pp. 396-398 ◽  
Author(s):  
B. Manallah
Keyword(s):  
Population Dynamics ◽  
Simple Model ◽  
Nuclear Spin ◽  
Continuous Wave ◽  
Double Resonance ◽  
Relaxation Times ◽  
Helium Temperature ◽  
Spin Population ◽  
Emission Signal ◽  
Wave Spectrometer

A delayed double resonance experiment was carried out using a Robinson-type continuous wave spectrometer. The sample chosen was s-triazine at liquid helium temperature, where the relaxation times are of the order of ten hours. Line pairings between the two Nitrogen-14 NQR sites were confirmed. Emission signals from ν- transitions were observed after successively saturating first the ν- line and then the ν+ line. The results are understood in terms of a simple model of spin population dynamics.

Vibrational and thermal averaging of the indirect nuclear spin-spin coupling constants of CH4, SiH4, GeH4 and SnH4

1997 ◽  
Vol 91 (5) ◽  
pp. 897-907 ◽  
Author(s):  
SHEELA KIRPEKAR ◽  
THOMAS ENEVOLDSEN ◽  
JENS ODDERSHEDE ◽  
WILLIAM RAYNES
Keyword(s):  
Nuclear Spin ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling

RESEARCH NOTE Nuclear spin statistical weights revisited

1999 ◽  
Vol 97 (6) ◽  
pp. 821-824 ◽  
Author(s):  
Per Jensen, P. R. Bunker
Keyword(s):  
Nuclear Spin ◽  
Research Note

Fluorescence properties and stimulated emission in substituted europium chelates

1967 ◽  
Vol 64 ◽  
pp. 173-182 ◽  
Author(s):  
Erhard J. Schimitschek ◽  
Richard B. Nehrich Jr ◽  
John A. Trias
Keyword(s):  
Stimulated Emission ◽  
Fluorescence Properties ◽  
Europium Chelates

Nuclear spin diffusion in a rare spin species

1982 ◽  
Vol 43 (7) ◽  
pp. 1049-1058 ◽  
Author(s):  
M. Goldman ◽  
J.F. Jacquinot
Keyword(s):  
Nuclear Spin ◽  
Spin Diffusion ◽  
Spin Species
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