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 70 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 (NOT AVAILABLE FROM SEPTEMBER 2015) 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 laser belongs to TREX Laboratory of Elettra Sincrotrone Trieste S.C.p.A. 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 (NOT AVAILABLE)||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|