“Photoexcitation spectroscopy and material alteration with free-electron laser,” J. Sturmann et al., Acta Physica Polonica A 91, 689–696 (1997). Abstract:
“Photoexcitation spectroscopy and material alteration with free-electron laser,” J. Sturmann et al., Acta Physica Polonica A 91, 689–696 (1997).