Publication

Relaxation-induced oscillations of spin-echo envelopes

Geoffrey Bodenhausen
1996
Journal Articles

Abstract

In scalar-coupled spin systems where in-phase and antiphase coherences have different lifetimes, the envelopes of spin echoes may feature modulations that are induced by relaxation. These modulations are most pronounced when the couplings that lead to the interconversion of in-phase and antiphase coherences are too small to provide an effective mechanism for averaging. The modulations occur even if the scalar coupling term is formally eliminated from the av. Hamiltonian that describes the evolution between initial excitation and the time of the echo. The frequency of the relaxation-induced oscillations is 1/2 of the scalar coupling const., and the modulation depth is detd. by the ratio between the difference in relaxation rates of the in-phase and antiphase coherences and the scalar coupling. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/3bf8c269-923a-41f6-8032-503198f12af9

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Geoffrey Bodenhausen
1996
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/3bf8c269-923a-41f6-8032-503198f12af9

About this result

Related concepts (32)

Modulation

In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer.

Spin–spin relaxation

In physics, the spin–spin relaxation is the mechanism by which Mxy, the transverse component of the magnetization vector, exponentially decays towards its equilibrium value in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). It is characterized by the spin–spin relaxation time, known as T2, a time constant characterizing the signal decay. It is named in contrast to T1, the spin–lattice relaxation time.

Frequency modulation

Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing. In analog frequency modulation, such as radio broadcasting, of an audio signal representing voice or music, the instantaneous frequency deviation, i.e. the difference between the frequency of the carrier and its center frequency, has a functional relation to the modulating signal amplitude.

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