Abstract
The upper energy limit of broadly tunable coherent radiation sources based on resonant four-wave mixing is investigated. An argon resonance [the two-photon (3p)54p[5/2](J=2)←(3p)6 resonance at 10 5617 cm−1] has been used in resonant four-wave mixing to generate tunable coherent narrow-bandwidth extreme ultraviolet radiation. With this resonance, spectroscopically useful laser intensities (up to 5×106 photons per laser pulse) can be produced beyond 19 eV with a bandwidth as low as 0.1 cm−1. The light source is used to record a pulsed-field-ionization zero-kinetic-energy photoelectron spectrum of the b 4Σg−(v+=1)←X 3Σg−(v=0) photoelectronic transition of O2.
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