News from the beamline
Installation of new emission spectrometer: Call for pilot proposals.A new von Hamos emission spectrometer is installed into the main endstation of the PHOENIX beamline. It is planned as a permanent installation for experiments with both focussed and unfocussed beam. The new spectrometer can be used simultaneously with fluorescence detection using a silicon drift diode. It will serve the tender X-ray range, i.e. covers the range of 2-4 keV. First commissioning was performed in October 2017. For the upcoming proposal round (deadline 15th of March 2018) we call for pilot proposals, which make use of this new instrument. Please contact the beamline scientist, Thomas Huthwelker (firstname.lastname@example.org) for further information.
New focussing options at PHOENIX II: Call for pilot proposals.The PHOENIX beamline operates two branchlines, PHOENIX I for the energy range 1-8 keV and PHOENIX II for the range 0.4-1.9 keV. Microfocussing is well established at PHOENIX I. For the low energy branchline, a new KB system (ca. 4-6 micrometer focal size) is currently installed, and the commissioning was performed in February 2018. For this instrument, we call for pilot proposals for the upcoming proposal round (deadline 15.03.2018). Ideally a good pilot project would need a beamsize of 4-5 micrometer, and requires imaging (mapping) and spectroscopy of light elements (e.g. K edges of N-Si, or L-edges in the range of 0.4-1.9 keV). Detection modes are fluorescence, transmission and total electron yield. For pilot proposals please contact the beamline scientists (email@example.com and firstname.lastname@example.org).
General beamline description and specificationsThe PHOENIX (Photons for the Exploration of Nature by Imaging and XAFS) beamline is dedicated to X-ray absorption (micro-) spectroscopy and imaging in the tender X-ray energy range of 0.4 to 0.8 keV. Due to its special energy range, PHOENIX is devoted to the study of light elements (K-edges of O-Fe, L –edges of Ca-Gd). A high photon flux is generated by an elliptical APPLE II undulator providing both linear and elliptical polarization. PHOENIX offers unique opportunities for high quality spectroscopy (i.e. EXAFS) and imaging of light elements, with the possibility of studying samples with low concentration. The beamline is equipped with two different end-stations providing state-of-the-art equipment to conduct X-ray micro-spectroscopic measurements (µ-XAS and µ-XRF) using fluorescence, absorption and total electron yield as detection methods. Chemical imaging of bulk samples can be done with spatial resolution in the micrometer range. Measurements can be conducted in different sample environments which include but not limited to liquid micro-jet, liquid flow cell and in situ titration cells. Current developments include a von Hamos emission spectrometer for use in the energy range 2-5 keV. Research at PHOENIX covers various fields, such as environmental sciences, catalysis, energy research, electrochemistry, cultural heritage and characterization of novel materials.
Examples of experiments which could be performed at the PHOENIX beamline :
- High quality EXAFS for low-Z elements, see for example Al K-edge in Vjunov et al.
- In situ XAS studies on functioning ion batteries, at the S K-edge in Gorlin et al., J. Electrochem. Soc. 162 (2015),
- Micro-spectroscopy on cultural heritage using micro-focused beam, e.g. Cato el al., Microchem. J. 126 (2016), and Meyer et al., Scanning (2017),
- XAS study of UV radiation damages in biological samples, e.g. J. Czapla-Masztafiak et al., Biophys. J. 110 (2016),
- Various liquid cells and liquid jets available for in-situ studies of chemical reactions (in collaboration).
The Phoenix Group is part of the Laboratory for Synchrotron Radiation and Femtochemistry (LSF).
|Energy range||0.8 - 8.0 keV PHOENIX I, 0.4 - 2.0 keV PHOENIX II|
|Flux (3 keV)||1 x 1011 ph/s/0.1%BW/400 mA|
|Energy resolution||1 x 10-4|
|Focused spot size||2.5 µm x 2.5 µm|
|Sample environments||Various sizes solid samples, pellets in vacuum; Moderate heating and cooling available; Titration cells, flow-through liquid cells, liquid jets (in collaboration)|