Transition Prabablities, Oscillator Strengths, Line Strengths, and lifetime of high-lying energy levels of singly ionized Helium (He II)
Description
This Excel file (name: 35344 lines.xlsx) contains 9569 transition lines (in sheet name: 9569) for ns(2S 1/2), np(2P 1/2), and np(2P 3/2) series of He II. The lifetimes of 176 levels from series ns(2S 1/2), np(2P 1/2), and np(2P 3/2) are determined from all transition channels of 9569 lines. Another dataset in the same file (sheet name: 25775) has 25775 lines up to n=43 for orbitals s,p,d,f,g,h,i,k. The lifetimes of 509 levels are estimated too.
Files
Steps to reproduce
This data was generated by utilizing Python environment. The following steps were taken into account to develop a computational framwork: 1. Available levels data for He II were extracted from NIST. 2. These levels were sorted to determine quantum defects for each spectral series using the Ritz expansion of quantum defects. 3. Quantum defects of each series were used in estimating Energies of extrapolated series for the principal quantum number (n) up to 60. 4. These calculated energies were later used to determine the expected radius value, which was then used in measuring dipole matrix. 5. After determining dipole matrix, line strengths (S), oscillator strengths (OS), and transition probability (Afi) were measured theoretically. 6. Lastly, the lifetime of all possible high-lying energy levels was determined.