CAMP@FLASH: an end-station for imaging, electron- and ion-spectroscopy, and pump–probe experiments at the FLASH free-electron laser

Erk, Benjamin; Müller, Jan Philippe; Bomme, Cédric; Boll, Rebecca; Brenner, Günter; Chapman, Henry N.; Correa, Jonathan; Düsterer, S.; Dziarzhytski, Siarhei; Eisebitt, Stefan; Graafsma, H.; Grünewald, S.; Gumprecht, Lars; Hartmann, R.; Hauser, Günter; Keitel, Barbara; Schmising, Clemens von Korff; Kuhlmann, Marion; Manschwetus, Bastian; Mercadier, Laurent; Müller, Erland; Passow, Christopher; Plönjes, Elke; Ramm, Daniel; Rompotis, Dimitrios; Rudenko, Artem; Rupp, Daniela; Sauppe, Mario; Siewert, Frank; Schlosser, Dieter; Strüder, L.; Swiderski, A.; Techert, Simone; Tiedtke, K.; Tilp, Thomas; Treusch, R.; Schlichting, Ilme; Ullrich, J.; Moshammer, R.; Möller, Thomas; Rolles, Daniel

doi:10.1107/s1600577518008585

Cited by 45 publications

(61 citation statements)

References 61 publications

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“…The last test case is that of a phenanthrene (C 14 H 10 ) pump-probe study [B. Manschwetus et al, manuscript in preparation] conducted at the CAMP end station of the Free Electron Laser At Hamburg (FLASH). [63] In this case, a twocolor experiment was done using XUV radiation with photon energy of 41 eV from FLASH and IR radiation produced by a 810 nm Ti:Sa laser. The time 0 , when the XUV and IR lasers were hitting the molecule simultaneously, and cross-correlation time cc = 130 fs were determined from electronic velocity map images (VMI) based on the helium fluorescence line and the first helium sideband.…”

Section: Phenanthrenementioning

confidence: 99%

Approaching black-box calculations of pump-probe fragmentation dynamics of polyatomic molecules

Tikhonov

Datta

Chopra

et al. 2020

Zeitschrift Für Physikalische Chemie

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AbstractA general framework for the simulation of ultrafast pump-probe time resolved experiments based on Born-Oppenheimer molecular dynamics (BOMD) is presented. Interaction of the molecular species with a laser is treated by a simple maximum entropy distribution of the excited state occupancies. The latter decay of the electronic excitation into the vibrations is based on an on-the-fly estimation of the rate of the internal conversion, while the energy is distributed in a thermostat-like fashion. The approach was tested by reproducing the results of previous femtosecond studies on ethylene, naphthalene and new results for phenanthrene.

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Section: Phenanthrenementioning

confidence: 99%

Approaching black-box calculations of pump-probe fragmentation dynamics of polyatomic molecules

Tikhonov

Datta

Chopra

et al. 2020

Zeitschrift Für Physikalische Chemie

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“…The experiment was performed at the CAMP station of the FLASH BL1 beam line [36]. Xe clusters were produced by expansion of a supersonic jet out of a conical nozzle [37]; the details of nozzle geometry are given in Appendix A.…”

Section: A Experimental Setupmentioning

confidence: 99%

Amplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters

et al. 2020

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Focused short-wavelength free-electron laser (FEL) pulses interacting with gas phase samples can induce by inner-shell ionization a short-lived population inversion, followed by coherent collective emission of directed, short, and strong radiation bursts. We extend our studies into the warm-dense matter (WDM) regime by investigating the nanoplasmas produced in an ensemble of nanometer-sized clusters by FEL irradiation. Here, additional pathways can also lead to strong, laserlike emission: Electron-ion collisions can yield a long-lived population inversion, and subsequent amplified spontaneous emission. We observe amplified spontaneous emission (ASE) in the extreme ultraviolet in xenon clusters excited by soft x-ray FEL pulses, we diagnose the generated nanoplasmas by fluorescence spectroscopy, and we study under various cluster and FEL parameters the directed ASE from the Xe 2+ 65 nm line. We show its exponential increase as a function of FEL irradiation power, and an accompanying collisional broadening of the emission spectra. These findings are corroborated by extensive numerical simulations based on theory, combining detailed hydrodynamic and kinetic simulations with time-dependent calculations of radiation transport, amplification, and collective emission in the WDM nanoplasma. Our theoretical findings underline that population inversion is due to electron-ion collisions and that the observed decoherence processes can be empirically characterized by a phenomenological decoherence time in the range of 100-200 fs.

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“…The measurement was performed at the CAMP endstation [20] at the beamline BL1 of the FEL FLASH at DESY [10]. The FEL was operated at a mean photon energy of 25.2 eV (49.2 nm) with an inherent bandwidth of 0.3-0.4 eV (FWHM).…”

Section: Description Of Fel and Nir Laser Parametersmentioning

confidence: 99%

“…The XUV and NIR pulses were overlapped spatially and temporally in the center of the CAMP endstation [20] interacting with a collimated neon gas jet (5 mm diameter) which had a density of ∼10 9 atoms cm −3 . The photoelectrons from the process Ne 2p 6  Ne + 2p 5 + e − with a kinetic energy of 3.6 eV (Ne 2p binding energy: 21.6 eV) were recorded using the long (upper) side of the double-sided flat-electrode velocity map imaging (VMI) spectrometer in the CAMP endstation, equipped with an MCP/phosphor screen and a CCD camera [20]. The alignment procedures for optimizing the VMI as well as finding spatial and temporal overlap have been described in [27,28].…”

Section: Setup Of the Experimentsmentioning

confidence: 99%

Two-color XUV+NIR femtosecond photoionization of neon in the near-threshold region

et al. 2019

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Results of angle-resolved electron spectroscopy of near-threshold photoionization of Ne atoms by combined femtosecond extreme ultraviolet and near infrared fields are presented. The dressedelectron spectra show an energetic distribution into so-called sidebands, being separated by the photon energy of the dressing laser. Surprisingly, for the low kinetic energy (few eV) sidebands, the photoelectron energy varies as a function of the emission angle. Such behavior has not yet been observed in sideband creation and has not been predicted in commonly used theoretical descriptions such as strong field approximation and soft photon approach. Describing the photoionization with a time-dependent Schrödinger equation allows a qualitative description of the observed effect, as well as the prediction of fine structure in the sideband distribution.

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CAMP@FLASH: an end-station for imaging, electron- and ion-spectroscopy, and pump–probe experiments at the FLASH free-electron laser

Cited by 45 publications

References 61 publications

Approaching black-box calculations of pump-probe fragmentation dynamics of polyatomic molecules

Approaching black-box calculations of pump-probe fragmentation dynamics of polyatomic molecules

Amplified spontaneous emission in the extreme ultraviolet by expanding xenon clusters

Two-color XUV+NIR femtosecond photoionization of neon in the near-threshold region

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