Construction of the multilayered-mirror monochromator beam line for the study of synchrotron radiation stimulated process

A multilayered-mirror (MLM) monochromator beam line designed specially for synchrotron radiation (SR) stimulated process experiments has been construc ted for the first time. The beam line was designed by the criteria; a beam spot size on the sample surface greater than or equal to 3 x 3 mm(2), a den sity of total irradiated photons greater than or equal to 10(18) photons/cm (2) (for an irradiation time of a few tens of minutes to a few hours), and low-energy background less than or equal to 1% of the output. The performan ce of the beam line was evaluated by measuring the transmitted photon flux of an Al filter around the Al L-2,L-3 absorption edge and by measuring the photoemission spectra of Ta using the output beam as an excitation light so urce. The Al thin film deposition was successfully demonstrated by using th e monochromatized output beam. We conclude that this MLM monochromator perf orms sufficiently well to study the excitation energy dependence in SR-stim ulated processes. (C) 1999 American Institute of Physics. [S0034-6748(99)02 606-4].