Soft X-ray undulator beam line I411 at MAX-II for gases, liquids and solidsamples

We report on the build-up of the new undulator beam line I411 at the third- generation synchrotron radiation facility MAX II in Lund, Sweden. This beam line is based on an upgraded version of the modified SX700-monochromator a nd the end station which were installed previously at beam line 51 at MAX I . The end station is equipped with a rotatable Scienta hemispherical electr on-analyser making angle-resolved high resolution electron spectroscopy pos sible for various kinds of samples. The beam line performance will be consi derably improved on ILIAX II due to a new undulator and the superior light source properties, e.g. the small vertical electron beam size. Undulator sp ectra have been measured and estimates of the photon flux at the experiment and the expected energy resolution are presented. The parameters for a new refocusing mirror were defined by ray tracing using the beam waist of the undulator. The beam line length was extended by 1 m to offer additional spa ce for exchangeable experimental chambers. (C) 1999 Elsevier Science B.V. A ll rights reserved.