SELECTED LIFETIME AND OSCILLATOR STRENGTH MEASUREMENTS IN Si II
نویسندگان
چکیده
We have remeasured the lifetimes of the 3s24s and levels in Si II using beam foil spectro3s25s 2S1@2 scopic techniques. Measured values for the lifetimes and oscillator strengths derived from them are presented and compared with previous measurements and theoretical calculations. Agreement with recent theoretical calculations is now quite good : for 3s24s it is excellent and for 3s25s it is satisfactory, although the theoretical uncertainties in that calculation are still somewhat larger than desired. Subject headings : atomic data È ISM: atoms
منابع مشابه
Determination of polarizabilities and lifetimes for the Mg, Zn, Cd and Hg isoelectronic sequences
The dipole polarizability and adiabatic correlations of atomic ions are related to the energy levels and oscillator strengths of the levels through bracketing inequalities. For systems with a ground state ns2 S0, the total oscillator strength is dominated by the unbranched intrashell ns2 S0–nsnp P1 transition, and the remaining oscillator strength can be narrowly bracketed using the f -sum rule...
متن کاملCoherent Excitation of the Optic Phonon in Si: Transiently Stimulated Raman Scattering with aFinite-Lifetime Electronic Excitation
Using 28-fs, 800-nm laser pulses we have coherently excited and subsequently probed, with time-dependent reflectivity, the Si zone-center optic phonon. The phonon-induced reflectivity change R /R is well described by the response of an underdamped oscillator: R /R exp −t / ph cos 2 t /Tph+ . The measured phase indicates that transiently stimulated Raman scattering TSRS is responsible for the co...
متن کاملLIFETIMES AND OSCILLATOR STRENGTHS FOR THE LEVELS IN Bi II 6 p 7 s 3 P 0
Lifetime measurements and empirical branching ratio estimates for the and levels in Bi II 6p7s 3P0 3P1 are reported, together with supporting theoretical calculations. These results are combined to yield absorption oscillator strengths between these levels and those of the 6p2 ground conÐguration. The results are discussed in the context of spectroscopic data obtained from orbiting telescopes. ...
متن کاملLifetimes and Oscillator Strengths for Ultraviolet Transitions in Singly Ionized Copper
High-quality oscillator strengths are needed to convert the amount of interstellar absorption into an accurate abundance from data acquired with the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer. In order to help clarify the appropriate values to use for ultraviolet transitions in Cu ii, we report lifetimes from our beam-foil experiments. The Cu ii results for the 1358.7...
متن کامل