Abstract
Fourier-transform-limited extreme-ultraviolet (XUV) radiation (bandwidth ) tunable around 91 nm is produced by use of two-photon resonance-enhanced four-wave mixing on the Kr resonance at . Noncollinear phase matching ensures the generation of an XUV sum frequency that can be filtered from auxiliary laser beams and harmonics by an adjustable slit. Application of the generated XUV light is demonstrated in spectroscopic investigations of highly excited states in and .
© 2005 Optical Society of America
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