High resolution atomic core level spectroscopy with laser harmonics

High resolution atomic core level spectroscopy is carried out on condensed matter systems using tunable harmonics generated by focusing light from an amplified 150 femtosecond dye laser system operating at 610 nm, into a pulsed source of Ar gas. We show core level spectra collected with the 15th (30.54 eV), 17th (34.61 eV), and 19th (38.68 eV) harmonics of the dye laser light. Each harmonic is separated by 4.07 eV and possesses a narrow energy bandwidth which can be used to generate high resolution core level spectra.