Abstract
The reaction microscope (REMI) endstation for atomic and molecular science at the free-electron laser FLASH2 at DESY in Hamburg is presented together with a brief overview of results recently obtained. The REMI allows coincident detection of electrons and ions that emerge from atomic or molecular fragmentation reactions in the focus of the extreme-ultraviolet (XUV) free-electron laser (FEL) beam. A large variety of target species ranging from atoms and molecules to small clusters can be injected with a supersonic gas-jet into the FEL focus. Their ionization and fragmentation dynamics can be studied either under single pulse conditions, or for double pulses as a function of their time delay by means of FEL-pump–FEL-probe schemes and also in combination with a femtosecond infrared (IR) laser. In a recent upgrade, the endstation was further extended by a light source based on high harmonic generation (HHG), which is now available for upcoming FEL/HHG pump–probe experiments.
Highlights
The invention of intense femtosecond infrared (IR) lasers [1] led to a new era in atomic and molecular physics, namely the devolopment of femtochemistry [2]
The ellipsoidal focussing mirror has a focal length of 1 m. It creates a demagnified image of the free-electron laser (FEL) source-point in the center of the reaction microscope (REMI) chamber
As will be shown in the following, it demonstrates a beneficial combination of the FEL and the IR laser
Summary
The invention of intense femtosecond infrared (IR) lasers [1] led to a new era in atomic and molecular physics, namely the devolopment of femtochemistry [2] Today it is often mentioned as one part of a much larger multi-disciplinary field called ultra-fast physics [3]; the observation of light-induced dynamics in small quantum systems on their natural time scale in the range of femto- or even attoseconds. In many cases a first “pump” pulse triggers certain dynamics, while a delayed “probe” pulse is used to interrogate the system at a later point in time This way, the temporal evolution of any specific process under investigation like molecular break-up [4], charge migration [5,6]. Depending on the specific application each of them comes with characteristic advantages and drawbacks
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
