Neutral Shadowing Force Effect on Structural Properties and Oscillations of Dust Particles in Cryogenic Environment

Recently, it was shown that the neutral shadowing interaction can be significantly stronger in the cryogenic complex plasma than in the plasma with neutrals at room temperature. Here, we present the results of the investigation-by molecular dynamics (MD) simulations-of the impact of the neutral shadowing interaction on the radial pair distribution function and the velocity autocorrelation function (VAF) of the charged dust particles in a 2-D layer. The spectrum of VAF was computed to estimate the influence of the neutral shadowing force on the oscillations of dust particles. We found that the neutral shadowing interaction can significantly affect the structural properties and the characteristic longitudinal oscillation frequency of dust particles if the characteristic radius of the neutral shadowing interaction exceeds a mean interdust particle distance. The latter case corresponds to low pressures, p <; 1 Pa, and cryogenic temperatures less than 10 K. In addition, the dust acoustic wave taking into account that the neutral shadowing force was derived. It is found that the neutral shadowing force leads to the increase of the sound speed of the dust acoustic wave.