We propose a simple technique for probing the single-particle and collective excitations in normal 3He via a standing magnetic surface wave of arbitrary Ω and fixed k generated by a meander-line coil. An analytic treatment of the Landau-Sillin equation enables us to calculate the power absorption spectrum, which displays singularities associated with the l = 0 spin mode and a Doppler-shifted spin resonance (DSSR) of the single-particle excitations. Experimental measurement of the spectrum would determine the Landau parameters (F0a, F1a) with spectroscopic precision. Furthermore, observation of the DSSR thresholds would provide an independent determination of the Fermi velocity Ν and F0a. Finally, a possibility of exciting higher, l ≥ 1, spin modes is briefly mentioned in the framework of an extended Leggett-Rice equation.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)