Spin Radiation: Properties and Suggested Experiments

POSTER  by  Stanislav Sykora, Extra Byte, Castano Primo, Italy

presented at

EUROMAR 2008, Saint Petersburg, Russia, July 6-11, 2008.

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In normal MR practice, nuclei are excited and their spin states are detected by induction coils or cavities. Under these conditions, a theoretical physicist has to cope with the complex problem of the interaction of nuclear spins with the front-end device via non-radiative electromagnetic field. This raises conceptual difficulties and doubts which are still not completely settled, especially when one wants to reconcile in a single theoretical framework the evolution of macroscopic nuclear magnetization (Bloch equations and classical induction) with the quantum characteristics of NMR spectra with their complex Hamiltonians and sharp transitions.

Recent studies of spin noise radiation are throwing new light on these problems and raise new questions about the emission and absorption of electromagnetic radiation by spin systems and its phase coherence.

The topic has been brought up by the author in the context of long-range detection and/or stimulation of spin radiation which might pave a way for MR on scales ranging from sub-planetary to astronomical.

This poster adresses several properties of spin radiation, such as its chirality and directionality, proposes experiments which might clarify whether they obey classical or quantum rules, and speculates about what does the more likely latter case imply in terms of remote spin-radiation spectroscopy.

There is little doubt that the outcome of such experiments would also lead to further elucidation of those conceptual aspects of spin radiation which are still objects of heated discussions.

References and links:

Notes added after the EUROMAR 2008 Conference:

Apart from the references and links listed above and in the poster, you might consult the following sources (though some have only an indirect bearing on the discussed topic:

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