The Endstations
A: Time-resolved pump-probe XAS
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The time resolved XAS/XMCD setup is operating at the Branch A of the BACH Beamline. The experimental setup combines Laser and Synchrotron Radiation (SR) in order to study the dynamics of the photo-induced excited states of electronic and magnetic systems. |
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The X-ray absorption spectroscopy (XAS and XMCD) open up various opportunities to probe laser-induced changes of the electronic, magnetic and geometric structure. The properties of the TR-XAS/XMCD@BACH endstation offer wide experimental conditions with respect to repetition rate, overall energy range, time-resolution, operation modes of the Synchrotron source and sample experimental enviroments.
Elettra Synchrotron radiation source provide radiation pulse widths sufficiently short to investigate dynamic processes in the time between 60 ps up to 0.5 μs. Typically, optical excitation of the sample is done by laser pulses (synchronized to either hybrid or multi bunch SR pulses), and probing is performed by time-delayed synchrotron radiation pulses. For the optical excitation of the sample we use a regenerative amplifier system (RegA9000 from Coherent) providing 5µJ photon pulses at a repetition rate of 250 kHz or a Mira HP Ti:Sa oscillator with a pulsepicker and produces 25nJ pulses with a repetition rate tunable between 1 and 83.3 MHz. The XAS experiments are performed measuring the X-ray fluorescence yield by means of an ultra-fast MCP detector (Hamamatsu). Different acquisition modes are available: full XAS energy scan, fixed Energy-time delayed acquisitions. |
| Feature of the Laser Sources | RegA9000 | Mira HP Ti:Sa oscillator |
| Wavelenght | 800nm; SHG: 400nm | 800nm; SHG: 400nm |
| Pulse width | 100 fs | 100 fs |
| Pulse energy | 5 μJ/pulse | 25 nJ/pulse |
| Repetition rate | 200-250 KHz | 83.3 MHz |
The experimental area around the branch C is flexible. User groups that wish to bring their own instruments or endstations to the beamline are encouraged to do so.
We invite users interested in installing a bulky piece of equipment (such as an entire experimental station) which takes a long time to assemble and dismount to discuss their project with the beamline local contacts well in advance before the submission deadline in order to check the technical feasibility.
Elettra accepts a limited number of long term projects. These are allocations of beam time over a two-year period. The proposer has to explicitly declare that the instrumentation will be at Elettra for the whole time of the long term project and available to other users. For more info, please visit the user info section.
