Studies of Energy Levels and Lifetimes in Neutral and Ionized Light Atoms

摘要

The spectrum of singly ionized titanium was analyzed by photographic spectral recordings of the light from a hollow cathode. Classified lines in the region 1200 A to 11000 A and term values are reported. Lifetime of the 3p 5 5p levels in neutral argon were measured by the high frequency deflection technique considering the trapping of radiation from the excited 3p 5 4s level. Energy levels and lifetimes of excited states were studied with the beam foil method for selected ions in the atomic number range 7 to 30. Influence of transition probabilities caused by hyperfine interaction for low members of the helium isoelectronic sequence is verified. The oscillator strength for the intercombination transition 1s 2 1S0-1s3p 3 p is measured in beryllium like nitrogen, oxygen and fluorine. Accurate determination of lifetimes for some of the lowest excited levels in Si I - Si IC and Zn II are reported. A large fraction of circularly polarized light is seen in the 0 VI n = 6 to 7 hydrogenic transition when a 4 MeV beam of oxygen was passed through a tilted carbon foil.