Abstract
In this work we measured the time dependence of the light intensity of the 1s22s 1S1/2–1s12p 1P3/2 resonance transition in Li-like Al ions after passing through a 10 µg/cm2 carbon foil. The measurements were done at beam energies of 0.8 MeV/u and 2.5 MeV/u. Also, the 1s5g–1s6h transition in He-like Al ions, after passing through the same thickness carbon foil, at 2.5 MeV/u was investigated. The results show very obvious decreases of the light intensity for the Li-like transition with beam exposure time of the foil at both beam energies, while a slow increase was observed for the He-like line intensity. In this work several different foil aging effects on line intensities are discussed and a new normalization scheme is proposed to improve the reliability of beam foil spectroscopy method in lifetime measurements.
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