Torsional spectroscopy by nuclear spin polarization losses in the rotating frame

Abstract

In some solids with moderately hindered torsional oscillators, such as NH₄ and CH₃ groups, it is possible to excite nuclear Zeeman-torsional transitions (double resonance). This type of resonance makes possible observations of resonant magnetization loss, torsional specific heat, torsion–phonon relaxation time and torsional energy spectrum. A brief description of these experiments is presented.