Transient nutations decay in diluted paramagnetic solids: a radiation damping mechanism

TL;DR

This paper proposes a radiation damping mechanism to explain the decay of nutation signals in diluted paramagnetic solids, emphasizing the roles of intensity and concentration, and challenging the significance of dipole-dipole interactions.

Contribution

It introduces a cavity loss (radiation damping) model that accounts for nutation decay, replacing traditional dipole-dipole interaction explanations in diluted paramagnetic solids.

Findings

Radiation damping explains nutation decay dependence on intensity and concentration.

Dipole-dipole interactions are negligible in the observed decay.

A unified damping parameter describes both transverse and longitudinal spin decay.

Abstract

Here, a theory of the intensity and concentration dependent damping of nutation signals observed by Boscaino et al. (Phys. Rev B 48, 7077 (1993); Phys. Rev. A 59, 4087 (1999)) and by others in various two-level spin systems is proposed. It is shown that in diluted paramagnetic solids contribution of dipole-dipole interaction to the nutation decay is negligibly small. We elaborated a cavity loss (radiation damping) mechanism that explains the intensity- and concentration dependence of the damping. It is shown that instead of ordinary Bloch's transverse T2 and longitudinal T1 damping parameters the decay of transverse and longitudinal spin components in nutation process are described by one and the same intensity-, concentration-, frequency- and time dependent damping parameter.