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 (F 0 a, F 1 a) with spectroscopic precision. Furthermore, observation of the DSSR thresholds would provide an independent determination of the Fermi velocity Ν and F 0 a. Finally, a possibility of exciting higher, l ≥ 1, spin modes is briefly mentioned in the framework of an extended Leggett-Rice equation.
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Bogacz, S.A., Ketterson, J.B. Surface coupling to collective and single-particle spin modes in normal 3He. J Low Temp Phys 71, 445–461 (1988). https://doi.org/10.1007/BF00116872
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DOI: https://doi.org/10.1007/BF00116872