Stark effect on the oscillator-strength distribution of helium near the ionization limit

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Abstract
The effect of electric fields of strengths up to 30 kV/cm on the absorption spectra of helium near the ionization limit has been investigated in detail with the use of synchrotron radiation from the SURF-II storage ring. In contrast to previous work on the heavier noble gases, the results show a strong dependence on the polarization of the source. A simple theoretical model is developed to explain the results. The relationship between the work reported here and previous theoretical and experimental studies is discussed.