The phonon spectrum due to random particle motion in a plasma crystal was measured. The crystal was made of negatively charged microspheres immersed in a plasma at a low gas pressure. It was found that the phonons obey a dispersion relation that assumed a Yukawa interparticle potential. Also, the wave energy measured in Fourier space was found to be approximately twice as large as the particle kinetic energy measured in configuration space.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)