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LDM

Low Density Matter at FERMI
 

The Low Density Matter (LDM) beamline has been built as part of the FERMI free-electron laser (FEL) facility to serve the atomic, molecular and cluster physics community.

The LDM beamline features a modular end-station accommodating a broad range of detectors and systems for producing targets. The combined capabilities of the photon source (high brilliance, short pulse length, variable polarization, coherence), photon transport (variable-focusing optics) and end-station allow the investigation of many targets, such as very dilute systems, matter under extreme irradiation conditions (multiple electronic excitation, multiple ionization, Coulomb explosion, non-linear optics) and dichroism. The split-and-delay line as well as, a synchronized optical laser allows time-resolved experiments with different combinations of femtosecond pulses.

The beamline was commissioned in 2012 and is undergoing rapid development. The LDM beamline is now open to external users .

Research highlights | Publications

Tracking attosecond electronic coherences using phase-manipulated extreme ultraviolet pulses

The direct control and manipulation of the phase of individual pulses within an XUV pulse sequence opens exciting possibilities for coherent control and multidimensional spectroscopy, but has not been accomplished. Here, we overcome these constraints in a highly time-stabilized and phase-modulated XUV-pump, XUV-probe experiment, which directly probes the evolution and dephasing of an inner subshell electronic coherence. A. Wituschek et al. Nature Communications, Vol. 11 - 1 (2020).

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Deep neural networks for classifying complex features in diffraction images

This work provides a general introduction on the capabilities of neural networks and provide results on the first domainadaption of neural networks for the use case of diffraction images as input data. J. Zimmermann et al. Physical Review E, Vol. 99 - 6 (2019).

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Complete Characterization of Phase and Amplitude of Bichromatic Extreme Ultraviolet Light

Here we demonstrate a method ofdetermining the absolute phase between two wavelengthsin a bichromatic XUV beam, as well as the coherentfraction of the relative intensity. The determination of phaseis independent of the intensity of the two wavelengths.
M. Di Fraia et al. Physical Review Letters, Vol. 123 - 21 (2019).

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Coherent control schemes for the photoionization of neon and helium in the Extreme Ultraviolet spectral region

This work presents a detailed description of how a seeded Free-Electron Laser can be used to perform some coherent-control experiments using the fundamental and second and third harmonics. The flexible design of FERMI provides excellent control of the wavelength, phase, and amplitude of light emitted by the FEL. L.Giannessi  et al. Scientific Reports, Vol. 8 -1 (2018)


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Ultrafast relaxation of photoexcited superfluid He nanodroplets

Superfluid He nanodroplets are ideal model systems for studying the photodynamics in weakly-bound nanostructures, both experimentally and theoretically. The present work shows that it is now possible to follow the relaxation dynamics of free nanodroplets in great detail using ultrashort tunable XUV pulses.
M. Mudrich et al. Nature Communications, Vol. 11, pp. 112 (2020).

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Attosecond pulse shaping using a seeded free-electron laser

We demonstrate amplitude and phase manipulation of the harmonic components of an attosecond pulse train in combination with an approach for its temporal reconstruction. The results presented here open the way to performing attosecond time-resolved experiments with free-electron lasers. 
P. K. Maroju et al. Nature (2020).


Illustration: J.Oschwald and C.Callegari.

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Symmetry breakdown of electron emission in extreme ultraviolet photoionization of argon

The existence of unexpectedly strong asymmetric emission patterns of electrons from sequentially ionized argon atoms in the vicinity of the respective Cooper minimum has been experimentally demonstrated by using intense femtosecond XUV pulses from the FEL-1 of FERMI. M. Ilchen et al. Nature Communications, Vol. 9, pp. 4659 (2018). 

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Acetylacetone photodynamics at a seeded free-electron laser

The unique combination of high intensity and energy resolution of the FERMI seeded free-electron laser (FEL) provided exceptionally detailed information about the photoexcitation-deexcitation and fragmentation dynamics of acetylacetone in pump-probe experiments on the 50-femtosecond time scale. R.J.Squibb et al. Nature Communications 9, 63 (2018)

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Control of H2 Dissociative Ionization in the Nonlinear Regime Using Vacuum Ultraviolet Free-Electron Laser Pulses

An important step towards the understanding and control of photoinduced fragmentation processes in molecules has been achieved in an experiment on the Hmolecule taking advantage of the unique properties of the FERMI free-electron laser source in the vacuum ultraviolet (VUV) photon energy range. F. Holzmeier  et al. Physical Review Letters, Vol. 121 - 10, pp. 103002 (2018)
 
 

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Complete reconstruction of bound and unbound electronic wavefunctions in two-photon double ionization

By controlling the polarization of the VUV–XUV light from the FERMI, the bound and continuum components of the system in the first and second ionization steps leading to the formation of doubly charged neon ions have been determined. P. Carpeggiani et al. Nature Physics. Vol. 15, pp. 170-177 (2019)

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News

  New VMI + TOF setup for LDM

  An upgrade of the VMI spectrometer has been designed and built up recently at LDM.
  Advantages of the new setup:
  •Less sensitive to the misalignment,
  •Less sensitive to the stray light,
  •Improved ion-TOF collection efficiency.
                                                                             












 Scattering detector commissioning at LDM

 

  The LDM scattering detector has been recently commissioned. The image shows the single-cluster scattering pattern from a He droplet of diameter 950 nm, taken with FERMI pulses at a wavelength of 64 nm.





 


Magnetic bottle commissioning at LDM

A magnetic bottle spectrometer, designed and built by Raimund Feifel and co-workers, has been installed, commissioned, and used for beamtime at LDM. The image shows a test spectrum, with O2 as target gas, taken at 21.2 eV photon energy
[contact: http://www.physics.gu.se/english/about-the-department/staff?languageId=100001&userId=xfeira ]





 VMI station at LDM

  An experimental station, devoted to experiments on gaseous samples at the Elettra GasPhase beamline and at LDM, was built and commissioned. The station is based on a Velocity Map Imaging detector for angular resolved photoelectron spectroscopy. A thorough description of this photoelectron analyser has been recently published in Nucl. Instr. Meth. B (2011),  doi:10.1016/j.nimb.2011.07.020. 
 

 

 




 

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Last Updated on Wednesday, 14 November 2018 14:34