The foil excitation technique, wherein a high-energy (2-MeV) beam of ions is passed through a thin (^-4000 A) carbon foil, has been used to measure lifetimes of excited electronic states in nitrogen n through V. The lifetimes were obtained by measuring the decay of optical radiation as a function of distance from the foil. The excited states were considerably above the ground state of the particular ion, and as a consequence, nonlinear population by cascading was minimal. Because of the low speed of the optical system (//8.8), only the most intense multiplets and members of multiplets were observed. The wavelength range in which transitions were observed was 2000 to 5000 A. The lifetimes measured were between 0.4 and 10 nsec. In general, these lifetimes apply to all the members of the multiplet, since the levels of origin as well as the levels of termination are closely spaced with respect to the total-angular-momentum quantum number /. Where it is possible, these lifetimes are compared with available calculations. Some transitions are untabulated and were identified through the use of a computer program.
Phys. Rev. 146, 53 (1966). 18 a 10 is an average of results given in footnote 12. a 1 is an average of the results given by Sheridan et al. (1961), Gordeev and Panov (1964), and DeHeer et al. (1966) of footnote 12 plus the result of E. S. Solov'ev, V. A. Il'lin, and H. V. Fedorenko, Zh. Eksperim. i Teor.The beam-foil technique has been used to measure lifetimes of excited electronic states in oxygen n through vi. The possibility of cascading from above affecting the measurements is discussed. Only the most intense multiplets and members thereof were observed in the range between 2000 and 5000 A. Where it is possible the lifetimes and some transition probabilities that may be extracted are compared with available calculations. A considerable number of transitions were untabulated and were identified through the use of a computer program.
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