Abstract
The effect of Debye plasma on the 1 s 2 s 2 2 S resonance states in the scattering of electron from helium atom has been investigated within the framework of the stabilization method. The interactions among the charged particles in Debye plasma have been modelled by Debye–Huckel potential. The 1 s 2 s excited state of the helium atom has been treated as consisting of a H e + ionic core plus an electron moving around. The interaction between the core and the electron has then been modelled by a model potential. It has been found that the background plasma environment significantly affects the resonance states. To the best of our knowledge, such an investigation of 1 s 2 s 2 2 S resonance states of the electron–helium system embedded in Debye plasma environment is the first reported in the literature.
Highlights
The effect of screened Coulomb interactions among the charged particles in hot and dense plasmas on the structural and collisional properties of atomic systems is a matter of great interest, because it gives us fundamental information for the interpretation of various phenomena associated with plasma physics, astrophysics, and experiments performed with charged particles [1,2,3,4,5,6,7,8,9]
The four-body electron–helium system was reduced to a three-body problem by the method of model potential
Though our present results for the unscreened case do not exactly match with the most accurate results available in the literature due to absence of two components in the wave function, our present investigation—believed to the first reported in the literature—provides a clear insight into the behaviour of resonance states due to the effect of background plasma
Summary
The effect of screened Coulomb interactions among the charged particles in hot and dense plasmas on the structural and collisional properties of atomic systems is a matter of great interest, because it gives us fundamental information for the interpretation of various phenomena associated with plasma physics, astrophysics, and experiments performed with charged particles [1,2,3,4,5,6,7,8,9]. In contrary to a free atomic system, screened Coulomb interactions greatly affect the structural and collisional properties, such as shift of the energy levels, spectral line broadening, change in line shapes, depression of ionization potentials, change of transition properties compared to free systems, and line merging phenomena [10].
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