Effects of non-ideality of classical plasmas on the 1Se resonance states in H−

Abstract

The effects of the non-ideality (NI) of the classical plasmas on the 1Se resonance states of the negative ion of hydrogen (H−) have been investigated theoretically by using the stabilization method. The organized effect of the plasma charged particles is represented by a pseudopotential, which depends on the Debye length D and the non-ideality parameter γ. Densities of the resonance states as a function of D and γ are calculated by employing a highly correlated and extensive basis set. Convergence of the resonance parameters (energy and width) is ensured by increasing the number of terms in the basis. Three 1Se resonance states are found to emerge below the H(4S) excitation threshold. Our present results for lowest lying resonance for plasma-free cases as well as in weakly coupled plasmas are in excellent agreement with the established results in the literature. An extensive study is carried out to explore the changes in the resonance parameters of the three states due to the effects of plasma NI. It is found that, for a given Debye length, the resonance energy increases, and the resonance width decreases with increasing plasma non-ideality.