- Conference date: 3-7 June 2002
- Location: Berkeley, California (USA)
Measurements of the spectrum of Fe 24+ in the 1.845 Å to 1.885 Å range obtained on the EBIT‐I electron beam ion trap at Lawrence Livermore National Laboratory were used for determining the radiative lifetime of the 1s2p 1 P 1 excited state. The spectrum contains electric dipole forbidden transitions at 1.855Å (“x”) and 1.868Å (“z”) whose lineshape is well represented by a Gaussian line profile and is assumed to be due primarily to Doppler and instrumental broadening. The Gaussian contribution is assumed to be the same for all lines in the spectrum. This assumption simplifies the problem when considering a more complex combination of broadening mechanisms. For allowed transitions such as 1s2p 1 P 1 → 1s 2 1 S 0, “w”, at 1.850 Å we assume a Voigt profile. In the simplest case this combines both natural (Lorentzian) and Doppler (Gaussian) broadening effects which contribute to the width of the spectral line. With the Gaussian contribution determined from lines “x” and “z”, deconvolving the Gaussian from the Voigt profile gives the natural line width. This then is directly related to the radiative lifetime of the 1s2p 1 P 1 excited level.
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