Strong Field QED in He-Like Heavy Ions

FIGURE 5.4 Left side X-ray spectra for capture into bare and H-like uranium (forming H- and He-like uranium, respectively) as measured at ESR electron cooler. Right side Schematic presentation of the RR process of free electrons into the initially bare and H-like ions. The energy difference AE = — ha ne gives exactly the two-electron contribution to the 

TABLE 5.1 Comparison of our experimental result for Z = 92 with the RMBPT calculations of Persson [25]. 2eSE and 2eVP denote two-electron self-energy and vacuum polarisation contributions, respectively. All values are in eV 

Nuclear charge 1st order RMBPT 2nd order RMBPT 2eSE 2eVP Total theory Experiment 

FIGURE 5.5 Po-Si transition in He-like systems as a function of the nuclear charge (relative to the values of Plante et ai [24]). The theoretical results are from Plante et at. [24], Drake [21] and Artemyev et al. [27]. For the experimental data see [30] and references therein. 

2 L-shell excited states in two-electron high-Z ions 

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