The linear response of an electron–ion plasma to an applied oscillating electric field is studied within the framework of Bloch’s classical hydrodynamic model. The ions are assumed to be fixed in space and distributed according to a known probability distribution. The linearized equations of...

The high-frequency behavior of the photoabsorption cross section of an ion immersed in a plasma is investigated in the framework of the Thomas–Fermi model, supplemented with Bloch’s hydrodynamic equations. It is shown that the singular nature of the electron density profile near the point...