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ABSTRACT THE phenomenon of amplitude modulation in the spontaneous emission of two-level masers has been observed by several investigators1–3, and has been the subject of a number of

theoretical discussions3–5. The basic mechanism underlying most of the semi-classical treatments is an oscillatory transfer of energy between the spin system, in the working substance, and

the cavity radiation field. In such a process the spin magnetization vector _M_ should undergo damped, pendulum-like nutations, correlated to the modulation of the emission, between the

inverted state, _M_ anti-parallel to the steady magnetic field in the _z_ direction, and the thermal equilibrium state, _M_ parallel to the steady field. The quantum mechanical treatment6 of

the interaction between the spin system and the radiation field in the cavity also suggests the oscillatory behaviour of _M__z_. Stevens6 further suggested that the direct observation of

the variation of _M__z_, during an oscillation pulse, would be a more instructive test of the theories mentioned than monitoring the modulated cavity energy. Evidence confirming the

suggested behaviour of _M_ has been obtained in an induction experiment designed to detect the variations in the ‘dipole’ field of _M__z_. Access through your institution Buy or subscribe

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access 04 August 2020 REFERENCES * Feher, G., Gordon, J. P., Buehler, E., Gere, E. A., and Thormund, C. D., _Phys. Rev._, 109, 221 (1958). Article  ADS  CAS  Google Scholar  * Chester, P.

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Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * School of Natural Philosophy, University of St. Andrews, I. M. FIRTH & D. BIJL Authors * I. M. FIRTH View author

publications You can also search for this author inPubMed Google Scholar * D. BIJL View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS

Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE FIRTH, I., BIJL, D. Detection of Spin Magnetization Variation in a Two-level Maser Oscillator. _Nature_ 192, 860–861 (1961).

https://doi.org/10.1038/192860a0 Download citation * Issue Date: 02 December 1961 * DOI: https://doi.org/10.1038/192860a0 SHARE THIS ARTICLE Anyone you share the following link with will be

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