Beam line 1411 at MAX II - performance and first results

We report on the characteristics and first results from the soft X-ray beam line I411, based on an undulator at the third generation synchrotron facil ity MAX II, Sweden. The beam line is designed for high-resolution, angle-re solved electron spectroscopy on gases, liquids and solids. Main components are the modified SX700 monochromator and the end station, both of which wer e previously used at beam line 51 at MAX I. The end station is equipped wit h a rotatable SES-200 hemispherical electron-analyser. Before the end stati on. a one-metre section is reserved for exchangeable experimental set-ups. The usable photon energy range is 50-1500 eV and the photon flux is two ord ers of magnitudes higher compared to beam line 51. At 400 eV a resolving po wer of about 5700 in the first order of the monochromator grating could be obtained. In gas phase, a total electron energy resolution of 16 meV has be en achieved. Detailed results on the undulator performance, flux, photon an d electron energy resolution as well as some technical details are presente d here. As an example of the capabilities of the beam line I411, we present the fully vibrationally resolved Auger resonant Raman electron spectrum of gas-phase N-2. (C) 2001 Elsevier Science B.V. All rights reserved.