On the Cherenkov mechanism of sound emission in the interaction of charged particles with a substance

The contribution of the Cherenkov mechanism of sound emission by secondary electrons produced in transmission of charged particles through metals is evaluated. The conductivity electrons ari treated as a Fermi gas. The energy of acoustic wave is calculated which is emitted in three stages - on the mean free path of the secondary electrons, during the development of the electron- electron cascade and in the process of electron-lattice relaxation. In case with Al, the transormation coefficient of the energy loss into sound energy by a traversing particle is found to be 3x10-11, 3x10-9 and 10-28 for the three stages respectively. The experiment on the possible observing the effect is discussed