Sertraline in post Stroke Depression in Irkutsk, Russia

Bykov, Yu. N.

doi:10.1186/isrctn60046672

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“…33 The near field does not radiate; also, it comprises longitudinal as well as transverse components; and its quantization is correspondingly complicated. 34,35 While earlier workers in NMR have sought to address the quantum near-field directly, 9 we have chosen here to neglect it, and to focus instead on the cavity operators, which describe the excitation of a resonant LC circuit, or equivalently, a single mode of a tuned cavity. This places our approach squarely in the mainstream of CQED, while allowing a direct focus upon the most consequential process in NMR reception: the transfer of photons from spins to cavity.…”

Section: Theorymentioning

confidence: 99%

A quantum description of radiation damping and the free induction signal in magnetic resonance

Tropp

2013

The Journal of Chemical Physics

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We apply the methods of cavity quantum electrodynamics (CQED), to obtain a microscopic and fully quantum-mechanical picture of radiation damping in magnetic resonance, and the nascent formation of the free induction signal. Numerical solution of the Tavis-Cummings model - i.e., multiple spins 1∕2 coupled to a lossless single-mode cavity - shows in fine detail the transfer of Zeeman energy, via spin coherence, to excite the cavity - represented here by a quantized LC resonator. The case of a single spin is also solved analytically. Although the motion of the Bloch vector is non-classical, we nonetheless show that the quantum mechanical Rabi nutation frequency (as enhanced by cavity coupling and stimulated emission) gives realistic estimates of macroscopic signal strength and the radiation damping constant in nuclear magnetic resonance. We also show how to introduce dissipation: cavity losses by means of a master equation, and relaxation by the phenomenological method of Bloch. The failure to obtain the full Bloch equations (unless semi-classical conditions are imposed on the cavity) is discussed in light of similar issues arising in CQED (and in earlier work in magnetic resonance as well), as are certain problems relative to quantization of the electromagnetic near-field.

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Section: Theorymentioning

confidence: 99%

A quantum description of radiation damping and the free induction signal in magnetic resonance

Tropp

2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

Sertraline in post Stroke Depression in Irkutsk, Russia

Cited by 1 publication

References 0 publications

A quantum description of radiation damping and the free induction signal in magnetic resonance

A quantum description of radiation damping and the free induction signal in magnetic resonance

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