PHOTON SCIENCE

The URSA instrument is designed for time-resolved photoelectron and x-ray absorption (yield mode) spectroscopy with molecules/atoms in gas phase, for AMO and gas phase chemical science. Samples are typically excited with an optical laser and then probed by an extreme-ultraviolet or soft x-ray pulse from the FLASH free-electron laser.

The URSA-PQ-vacuum system is based on a customized six-way cross chamber of type DN 250 CF. The design allows a versatile use with different equipment and at different beamlines. The ports on the spectrometer axis and the top port have dimensions equal to the DN 250 CF ports of the CAMP instrument. Especially, the distance from flange to interaction region equals 260 mm.

The magnetic bottle electron spectrometer with energy resolution of about 1/40 allows for retardation and thus optimal electron energy resolution in a flexible kinetic energy range.

We offer gas needles as sample insertion for gases from bottles, evaporating liquids or highly volatile solids. In addition a capillary oven allows for the spectroscopy of solid samples with vapor pressures around 10-4 mbar or more at 150 C.

Contact: Fabiano Lever

Instrument Paper
Metje et al., Appl. Sci. 10, 7882 (2020)

Related Scientific Publications
1. Lever et al., J. Phys. B: At. Mol. Opt. Phys.54, 014002 (2020)
2. Lever et al., Molecules 26, 6469 (2021)
3. Mayer et al., Nature Communications 13, 198 (2022)