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Binding energy of the hydrocarbon component peak at 285 eV was used as a reference. The PWB cross sections are calculated from uncorrelated wave functions, and the scaling requires only the binding energy B of the bound electron that is excited, the excitation energy E, and an accurate dipole oscillator strength f for the transition. For example, the binding energy of the extra electron in a negatively charged calcium ion is sufficiently low that the ions measured lifetime of 490 microseconds is determined almost entirely by environmental blackbody radiation. |
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