2025/06/24 by Gleb Penyazkov, Penyazkov, Gleb, Yanmei Yu +5 · 3 citations
Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic and Subatomic Physics Research #Radioactive Decay and Measurement Techniques
paper · pdf · doi:10.48550/arxiv.2506.19963
The relativistic Fock-space coupled-cluster methods are applied to the cadmium atom. A large number of transition energies and matrix elements are calculated for the 5s2 1S → 5snp 1,3 Po, 5s6s 1S → 5snp 1,3 Po and 5s5d 1D → 5snp 1,3 Po transitions for a wide range of p states accounting for relativistic and electron-correlation effects. The results obtained within two different approaches (Fock-space coupled cluster and configuration interaction) are compared with available experimental and theoretical data. Good agreement is found between the two methods for transitions involving low-lying excited p-states, whereas for high-lying states, the discrepancy becomes large. The calculated values are used to determine the third-order nonlinear susceptibility of cadmium vapor, with an agreement within 5% between the different methods. The results of the present computations support the feasibility of generating vacuum ultraviolet light in Cd vapor via a four-wave mixing process for the spectroscopy of 229Th isomer transition.