CFEL-ARD

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2017-08-21
15:12
[PUBDB-2017-09601] Journal Article
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An endstation for resonant inelastic X-ray scattering studies of solid and liquid samples
ddc:540
A novel experimental setup is presented for resonant inelastic X-ray scattering investigations of solid and liquid samples in the soft X-ray region for studying the complex electronic configuration of (bio)chemical systems. The uniqueness of the apparatus is its high flexibility combined with optimal energy resolution and energy range ratio. [...]
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2017-04-06
08:33
OpenAccess [PUBDB-2017-01527] Journal Article
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Study on laser characteristics of Ho:YLF regenerative ampliers: Operation regimes, gain dynamics, and highly stable operation points
ddc:530
We present a comprehensive study of laser pulse amplification of Ho:YLF regenerative amplifiers (RAs) with respect to operation regimes, gain dynamics, and output pulse stability. The findings are expected to be more generic than for this specific gain material. [...]
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2017-03-21
16:21
[PUBDB-2017-01439] Journal Article
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Hot carrier relaxation in CdTe via phonon–plasmon modes
ddc:530
Carrier and lattice dynamics of laser excited CdTe was studied by time-resolved reflectivity for excitation fluences spanning about three orders of magnitude, from 0.064 to 6.14 mJ cm$^{−2}$. At fluences below 1 mJ cm$^{−2}$ the transient reflectivity is dominated by the dynamics of hybrid phonon–plasmon modes. [...]
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2017-01-16
11:23
OpenAccess [PUBDB-2017-00571] Journal Article/Contribution to a conference proceedings/Contribution to a book
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High energetic and highly stable pulses from a Ho:YLF regenerative amplifier
Solid State Lasers XXV: Technology and Devices
Solid State Lasers XXV: Technology and Devices, SPIE LASE, Meeting locationSan Francisco, California, 15 Jul 2016 - 20 Jul 20162016-07-152016-07-20
Proceedings of SPIE 9726, 97260S (2016) [10.1117/12.2212236]  GO
ddc:620
We present results from our Ho:YLF regenerative amplifier (RA) producing up to 6.9 mJ at a repetition rate of 1 kHz and up to 12.9 mJ at a repetition rate of 10 Hz. At 1 kHz, we observe strongly bifurcating pulses, starting with certain round trip number, but the measurements identify a highly stable operation point that lies “hidden” beyond the instability region. [...]
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2017-01-09
14:47
Embargoed OpenAccess [PUBDB-2017-00332] Journal Article
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Measurement of Ultra Low Transverse Emittance at REGAE
ddc:530
The linear accelerator REGAE at DESY produces short and low charged electron bunches, on the one hand to resolve the excitation transitions of atoms temporally by pump-probe electron diffraction experiments and on the other hand to investigate principal mechanisms of laser plasma acceleration. For both cases a high quality electron beam is required which can be identified with a small beam emittance. [...]
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2017-01-06
16:05
[PUBDB-2017-00240] Journal Article
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Fixed target combined with spectral mapping: approaching 100% hit rates for serial crystallography
ddc:570
The advent of ultrafast highly brilliant coherent X-ray free-electron laser sources has driven the development of novel structure-determination approaches for proteins, and promises visualization of protein dynamics on sub-picosecond timescales with full atomic resolution. Significant efforts are being applied to the development of sample-delivery systems that allow these unique sources to be most efficiently exploited for high-throughput serial femtosecond crystallography. [...]

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2016-11-29
12:51
OpenAccess [PUBDB-2016-05704] Journal Article
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Two-electron processes in multiple ionization under strong soft-x-ray radiation
ddc:530
In a combined experimental and theoretical study we have investigated the ionization of atomic argon upon irradiation with intense soft-x-ray pulses of 105 eV photon energy from the free-electron laser FLASH. The measured ion yields show charge states up to Ar$^{7+}$. [...]
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2016-11-18
12:47
OpenAccess [PUBDB-2016-05378] Journal Article
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Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments
ddc:540
Combining microfluidics with coherent X-ray illumination offers the possibilityto not only measure the structure but also the dynamics of flowing samples in asingle-scattering experiment. Here, the power of this combination is demon-strated by studying the advective and Brownian dynamics of colloidalsuspensions in microflow of different geometries. [...]
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2016-11-09
22:58
[PUBDB-2016-04813] Conference Presentation
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High energetic and highly stable pulses from a Ho:YLF regenerative amplifier
Solid State Lasers XXV: Technology and Devices, SPIE LASE, Meeting locationSan Francisco, California, 15 Jul 2016 - 20 Jul 20162016-07-152016-07-20
ddc:620
We present results from our Ho:YLF regenerative amplifier (RA) producing up to 6.9 mJ at a repetition rate of 1 kHz and up to 12.9 mJ at a repetition rate of 10 Hz. At 1 kHz, we observe strongly bifurcating pulses, starting with a certain round trip number, but the measurements identify a highly stable operation point that lies “hidden” beyond the instability region. [...]

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2016-09-14
16:02
OpenAccess [PUBDB-2016-03652] Book/Report/Dissertation / PhD Thesis
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An atomic perspective of the photodissociation and geminate recombination of triiodide in condensed phases
[DESY-THESIS-2016-028]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS, 162 pp. (2016) [10.3204/PUBDB-2016-03652] = Dissertation, Universität Hamburg, 2016  GO
The thesis presents progress made towards a thorough understanding of the photodissociation and geminate recombination of triiodide anion (I$_3^-$) in solution and solid state using novel time-resolved spectroscopic and structural methods that have matured in the past decade. An isolated I$_3^-$ has only three degrees of freedom, but in the condensed phase, the case of an open quantum system, its chemistry is transformed because other degrees of freedom from the surroundings (the bath) need to be fully taken into account. [...]
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