Lifetime Of High Rydberg States In Na

The radiation lifetime of an atom is a basic attribute of an atom and can reflect the structure and energy level of the atom.Therefore,it is widely used in many fields such as atomic structure theory,astronomical spectrum analysis,laser isotope separation,and gas discharge[1].Because the structure of the alkali metal Rydberg atom is relatively simple and similar to a hydrogen atom,its radiation lifetime has gained more theoretical research.The main research work of this paper is to overcome the difficulty of calculating the radial matrix elements of the highly excited alkali metal atom by the traditional Coulomb approximation and quasi-classical approximation,and to calculate the radial direction of the high-lying state of the alkali metal atom by a new method.Matrix element.Using the B-spline expansion technique and model potential,a double-precision numerical integration is used to calculate the radial matrix elements of the high-Rydberg states with up to 140 main quantum numbers,and finally calculate n≤140 at different temperatures T.The radiation lifetime of the sodium atom at Rydberg state.The theoretical value of the radiation lifetime calculated by the quasi-classical approximation method is increased from the main quantum number n=80 to n=140.The obtained results are in good agreement with the experimental values and the existing main theoretical values.The calculated lifetime is Reference data are provided for relevant experimental measurements of alkali metal high excited state radiation lifetimes.