Spectral and temporal features of multiple spontaneous NMR-maser emissions
CEA, IRAMIS, Service de Chimie Moléculaire, Laboratoire Structure et Dynamique par Résonance Magnétique, URA CEA/CNRS 331, 91191 Gif-sur-Yvette, France
Corresponding author: a email@example.com
Revised: 25 September 2008
Published online: 6 February 2009
When a system composed of dissolved laser-polarized xenon with negative spin temperature is put inside a high field NMR magnet, a series of spontaneous maser emissions can be observed. We report here their spectral and temporal features using a processing model derived from the solution of the Bloch equations in the presence of radiation damping. We show, in particular, that by combining Fourier transformation and squared modulus, a parameter allowing the characterization of the burst of transverse magnetization can be determined. This parameter is shown to be correlated with the radiated energy. Moreover, this processing clearly reveals features which can probably be assigned to effects resulting from distant dipolar fields. Finally, the analysis of the experimental data reveals an unexpected behavior of the 129Xe transverse self-relaxation.
PACS: 84.40.Ik – Masers; gyrotrons / 82.56.-b – Nuclear magnetic resonance / 76.60.Es – Relaxation effects / 32.80.Xx – Level crossing and optical pumping of atoms
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009