Question

* In a plasma we have a similar situation to that in semiconductors where two species of particles experience diffusion please tell me what these 2 symbols are nm DDe because m,> >m.

Answer 1

A plasma consists of equal number of positively charged ions and negatively charge electrons. The subscript �i� is used for ions and �e� is used for electrons. In one given equation: - gamma_e - It is the flux of diffusing electrons. The flux of diffusing particles is given by, gamma = mu n E - D nabla_n equation(1) For E = 0 or mu = 0 gamma = -D nabla_n equation(2) here, for electrons we use gamma_e = -De nabla_n and for ions we use nabla_i = -D_i nabla_i D_e - It is the diffusion coefficient of the electrons. It quantifies the amount of substance that diffuses from one region to another.