Abstract
The possible use of level-crossing spectroscopy to study properties of excited states generated by gas excitation of fast ionic beams has been investigated. With a 20-400 keV Be+beam excited by means of helium gas, radiative lifetimes of2D and2F levels in Be II have been determined together with the fine-structure separation of the 5f2F level in Be II and the hyperfine coupling constant for the 2s3d1D level in Be I and the 2p2p level in Be II.
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