Beam-Foil Lifetime Studies of Highly Ionized Silicon

Abstract

Beam-foil lifetime studies of high1.v ionized silicon.

Phase-Change Kinetics of Bi–Fe–(N) Layer for High-Speed Write-Once Optical Recording

“…A channeltron with a dark count rate <l/min is used as the detector. Further details of the experimental set-up can be found elsewhere [33]. A provisional detection efficiency curve of the monochromator/detector system (with the 600 l/mm grating) has been established [30].…”

“…Experiment shows that particularly the Ly, radiation can easily be detected after much longer times because of the strong repopulation by cascades from ns levels and along the yrast line (levels with maximum orbital angular momentum 1 for a given principal quantum number n). The approximate shape of the detection window function (field-of-view plus efficiency of the grating) is used in the analysis of the decay curves [33].…”

“…[25,43,44]. The analysis of the present experimental data involves the spatial resolution function of the spectrometer (field-of-view at the ion beam) [33] and is capable to determine lifetimes as short as 5 to l o p s under favourable circumstances. The results are given in Table 2.…”

Beam-foil excitation studies of hydrogen-like ions

“…A 6001/mm gold coated concave grating (~b~aze=12.7nm) serves as the disperging element. The channeltron detector is screened against secondary electrons by a negatively charged metal grid [18][19][20]. In the various hydrogenlike ions the transitions corresponding to Lye, Lyp, H a and H~ have been observed.…”

MCDHF Calculations and Beam-Foil EUV Spectra of Boron-Like Sodium Ions (Na VII)

“…In the late 1970s, the Bochum beam-foil spectroscopy group began to measure EUV spectra and decay curves of B-like ions of Si and P [18][19][20][21][22][23]; references to various earlier calculations of oscillator strengths and transition rates are given in those papers. In the 1990s, the Bochum group returned to measurements of detailed processes in B-like ions, such as the massive changes of multiplet line intensity patterns (away from the standard expectation of LS coupling that had been tabulated 80 years ago by White and Eliason [24]), due to the changes in level mixing along the isoelectronic sequence [25].…”