An easy to build, high intensity monochromator for Helium II radiation applied to inner valence photoelectron studies of small molecules.
P. Baltzer, M. Carlsson G0the, B. Wannberg and L. Karlsson
Abstract: An easy to build, high intensity monochromator for helium II radiation is presented. The design includes a double focusing, non blazed, toroidal grating with a groove density of 800 l/mm. The adjustments and focusing properties of the design have been studied using an optical simulation program. It is found that all necessary adjustments of the grating may be performed by using only two degrees of freedom; rotation and sidewise shifting. Inner and outer valence photoelectron spectra of N2 and CO have been recorded using monochromatized HeIIa radiation. The study reveals extensive vibrational structures in the inner valence region of both molecules. A new state has been identified in the CO molecule.
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