Effect of finite $\omega \tau$ on cyclotron-wave propagation in metals in the long-wavelength limit

Exact calculations of cyclotron-wave dispersion curves have been carried out for a degenerate free-electron metal including finite relaxation time effects. The calculated dispersion curves are shown to differ substantially from the experimental dispersion curves in the long-wavelength limit. The nature of this disagreement is discussed in some detail and it is pointed out that finite relaxation time effects could lead to significant changes in the experimentally determined Fermi-liquid parameters {$A_i$} for $i\ge 2$.