Photoionization of Li and Na in Debye plasma environments

Abstract

A calculation of the photoionization cross sections is presented for alkali-metal atoms such as Li and Na in plasma environments. The computational scheme is based on the complex coordinate rotation method. A model potential formalism has been used to simplify the computational complexity of the problems of making quantitative predictions of properties and interactions of many electron systems in Debye plasmas. The plasma environment is found to appreciably influence the photoionization cross sections. In this regard the photoionization cross sections of isolated atoms are also discussed that is found to be in good agreement with the previous theoretical results. It is observed that the strong plasma screening effect remarkably alters the photoionization cross sections near the ionization threshold. The Cooper minimum in the photoionization cross sections of Na shifts toward the higher energy as the plasma screening effect increases. For Li, the Cooper minimum is uncovered in strong plasma environments. This is the first time such structures have been determined.

Photoionization Cross Sections of Atomic Impurities in Spherical Quantum Dots

“…As observed in Fig. 10 (Sahoo & Ho (2006)). Experimental data by NIST refer to (Ralchenko et al (2011)).…”

“…The energies of ground and first few excited states obtained by this model potential for the lithium atom are compared to the experimental data (Ralchenko et al (2011)) in Table 2. Although the calculated ground-state energy of lithium atom is not as precise as the energy of excited states, the photoionization cross sections of free lithium atom as shown in Table 3 (Sahoo & Ho (2006)). Experimental data by NIST refer to (Ralchenko et al (2011) (Sahoo & Ho (2006)).…”

“…Although the calculated ground-state energy of lithium atom is not as precise as the energy of excited states, the photoionization cross sections of free lithium atom as shown in Table 3 (Sahoo & Ho (2006)). Experimental data by NIST refer to (Ralchenko et al (2011) (Sahoo & Ho (2006)). Data by Peach et al refer to (Peach et al (1988)).…”

Dynamic multipole polarizabilities of Li and Na atoms interacting with Debye potentials

“…To find the best values of the model potential parameters, we follow our earlier works [1,44,45,[47][48][49][50]. For Li system, the best values of the parameters for all the partial-wave states are δ 1 = δ 2 = δ 3 = 1 6559.…”

“…As mentioned earlier we have used the model potential technique to represent the proposed atomic systems. In this work, we employ a simple model potential [1,44,45,49,50] of the form…”