Ultrafast Coulomb explosion of a diiodomethane molecule induced by an X-ray free-electron laser pulse

2017 ◽  
Vol 19 (30) ◽  
pp. 19707-19721 ◽  
Author(s):  
Tsukasa Takanashi ◽  
Kosuke Nakamura ◽  
Edwin Kukk ◽  
Koji Motomura ◽  
Hironobu Fukuzawa ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Laser Pulse ◽  
Free Electron ◽  
Free Electron Laser ◽  
Coulomb Repulsion ◽  
Coulomb Explosion ◽  
Carbon Ions ◽  
X Ray ◽  
Atomic Ions ◽  
Explosion Mechanism

The Coulomb explosion mechanism of a CH2I2 molecule is rather different to that of CH3I. The kinetic energy of iodine ions is ∼3 times larger due to Coulomb repulsion of the two iodine ions, while that of carbon ions is almost the same for both, as indicated by the red arrows that represent kinetic energies of the atomic ions.

Capturing the photo-induced dynamics of nano-molecules by X-ray free electron laser induced Coulomb explosion

2019 ◽  
Vol 151 (12) ◽  
pp. 124305
Author(s):  
Kaoru Yamazaki ◽  
Naoyuki Niitsu ◽  
Manabu Kanno ◽  
Kiyoshi Ueda ◽  
Hirohiko Kono
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Coulomb Explosion ◽  
X Ray

scholarly journals Suppression of resonant auger effect with chirped x-ray free-electron laser pulse

2018 ◽  
Vol 51 (3) ◽  
pp. 035602 ◽  
Author(s):  
Yu-Ping Sun ◽  
Quan Miao ◽  
Ai-Ping Zhou ◽  
Rui-Jin Liu ◽  
Bo Liu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Free Electron ◽  
Free Electron Laser ◽  
X Ray ◽  
Auger Effect

Possibility of X-ray pulse compression using an asymmetric or inclined double-crystal monochromator

2013 ◽  
Vol 20 (4) ◽  
pp. 550-554 ◽  
Author(s):  
Jaromir Hrdý ◽  
Peter Oberta
Keyword(s):  
Laser Pulse ◽  
Free Electron ◽  
Free Electron Laser ◽  
Pulse Compression ◽  
Compact Scheme ◽  
Mutual Distance ◽  
Compression Scheme ◽  
Double Crystal ◽  
X Ray ◽  
Double Crystal Monochromator

It is shown theoretically that the asymmetric or inclined double-crystal X-ray monochromator may be used for X-ray pulse compression if the pulse is properly chirped. By adjusting the mutual distance of the two asymmetric or inclined crystals it should be possible to achieve even a sub-femtosecond compression of a chirped free-electron laser pulse. The smalld-spacing of the crystal enables a more compact scheme compared with the currently used grating compression scheme. The asymmetric cut of the crystal enables the acceptance of a larger bandwidth. The inclined cut has larger tunability.

Thermomechanical optimization of the cathode design intended for the X-ray free-electron laser oscillator injector electron gun

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
B. Brajuskovic ◽  
R. Lindberg ◽  
N. Sereno
Keyword(s):  
Thermal Analysis ◽  
Laser Pulse ◽  
Free Electron ◽  
Free Electron Laser ◽  
Thermal Stresses ◽  
Laser Oscillator ◽  
Transient Thermal Analysis ◽  
X Ray ◽  
Cathode Design ◽  
Transient Thermal

The Advanced Photon Source at Argonne National Laboratory is developing a low-emittance thermionic gun for a proposed X-ray free-electron laser oscillator (XFEL-O) that will use a laser pulse-heated cathode. The cathode must operate at or slightly above 1500 °C for several nanoseconds and then cool down several hundred °C in approximately the same amount of time, with a 1-MHz heating–cooling cycle. A transient thermal analysis was performed to optimize the laser pulse shape needed to provide the desired temperature response of the cathode for several possible cathode materials. In addition, thermal stresses developed in the cathode during heating–cooling cycles were analysed. Both transient thermal analysis and thermal stress computations were performed using the ANSYS12 code. The computed temperature distribution and thermal stresses were utilized in the optimization of the cathode design. The results of the analysis are presented.

scholarly journals X-ray multiphoton ionization dynamics of a water molecule irradiated by an x-ray free-electron laser pulse

2016 ◽  
Vol 94 (2) ◽  
Author(s):  
Ludger Inhester ◽  
Kota Hanasaki ◽  
Yajiang Hao ◽  
Sang-Kil Son ◽  
Robin Santra
Keyword(s):  
Laser Pulse ◽  
Water Molecule ◽  
Free Electron ◽  
Free Electron Laser ◽  
Multiphoton Ionization ◽  
X Ray

scholarly journals Ultrafast Dynamics of a Nucleobase Analogue Illuminated by a Short Intense X-ray Free Electron Laser Pulse

2016 ◽  
Vol 6 (2) ◽  
Author(s):  
K. Nagaya ◽  
K. Motomura ◽  
E. Kukk ◽  
H. Fukuzawa ◽  
S. Wada ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Free Electron ◽  
Free Electron Laser ◽  
Ultrafast Dynamics ◽  
X Ray

scholarly journals Increased gain of the lateral-injection free-electron laser and the use of clusters for amplication in the X-ray range

1986 ◽  
Vol 4 (1) ◽  
pp. 83-89 ◽  
Author(s):  
Heinrich Hora ◽  
Jin-Cheng Wang ◽  
P. J. Clark ◽  
R. J. Stening
Keyword(s):  
Laser Pulse ◽  
Free Electron ◽  
Free Electron Laser ◽  
High Efficiency ◽  
High Gain ◽  
Difficult Problem ◽  
Solid Particles ◽  
Laser Amplifier ◽  
Plasma Properties ◽  
X Ray

Using radial plasma acceleration in a laser beam, an alternative type of free electron laser has been developed by radial injection of electrons. Its properties have been elaborated for a laser amplifier of 400 μtm wavelength. To overcome the difficulties of this FEL, a basically new laser amplifier concept has been developed where a laser pulse is amplified by nearly lateral injection of solid particles (clusters, pellets etc.) whose kinetic energy (at appropriate adjustment and synchronisation) is converted into 80% optical energy of the laser pulse. The mechanism of energy transfer is the radial slowing down by nonlinear ponderomotive forces of the plasma made from the cluster reaching the beam axis, and the switching-off process of the beam with regard to the transient nonlinear force processes. It is an inversion of the plasma ejection with ponderomotive self-focussing. Apart from the unusually high efficiency, a relatively high gain is expected even for such small laser wavelengths as 10 nm. Furthermore, the difficult problem of modification of phase fronts and convergence (focussing, directing of X-ray beams) should be solved by the optical plasma properties at injection.

scholarly journals Electron and fluorescence spectra of a water molecule irradiated by an x-ray free-electron laser pulse

2018 ◽  
Vol 97 (5) ◽  
Author(s):  
Julia M. Schäfer ◽  
Ludger Inhester ◽  
Sang-Kil Son ◽  
Reinhold F. Fink ◽  
Robin Santra
Keyword(s):  
Laser Pulse ◽  
Water Molecule ◽  
Free Electron ◽  
Free Electron Laser ◽  
Fluorescence Spectra ◽  
X Ray
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