Effects of Debye plasmas on two-photon transitions in lithium atoms

Abstract

We have studied two-photon transition rates of atomic lithium within model potential by using the pseudostate summation approach. Transition amplitudes and absorption coefficients have been computed for $2s\text{\ensuremath{-}}3s$, $2s\text{\ensuremath{-}}4s$, and $2s\text{\ensuremath{-}}3d$ transitions with various Debye lengths. In the case of $2s\text{\ensuremath{-}}3s$ transition, two-photon transparency vanishes for smaller Debye length. Reverse incident occurred for $2s\text{\ensuremath{-}}3d$ transition. Here, we have found a two-photon transparency for lower values of Debye length. These two situations occur due to energy level shifting in the presence of a plasma environment. A detailed description of resonance enhancement frequency and transition amplitude has been analyzed.