Abstract
Coherent extreme ultraviolet (XUV) radiation was generated by four-wave sum frequency mixing via the B 1Σ + ( v' = 0) state of CO. The XUV intensity was found to be strongly wavelength dependent. The analysis of the spectrum revealed (i) that the XUV intensity was enhanced at high energy side of rotational levels of the probed Rydberg states and (ii) that the observed rotational structure is in accordance with the selection rules holding for ordinary single photon transitions. The results are duscussed in terms of the third-order non-linear processes in isotropic media.
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