scholarly journals Imaging molecular structure through femtosecond photoelectron diffraction on aligned and oriented gas-phase molecules

2014 ◽  
Vol 171 ◽  
pp. 57-80 ◽  
Author(s):  
Rebecca Boll ◽  
Arnaud Rouzée ◽  
Marcus Adolph ◽  
Denis Anielski ◽  
Andrew Aquila ◽  
...  
Keyword(s):  
Gas Phase ◽  
Angular Distributions ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Time Resolved ◽  
Pump Probe ◽  
X Ray ◽  
Photoelectron Diffraction ◽  
Gas Phase Molecules ◽  
Photoelectron Angular Distributions

This paper gives an account of our progress towards performing femtosecond time-resolved photoelectron diffraction on gas-phase molecules in a pump–probe setup combining optical lasers and an X-ray free-electron laser. We present results of two experiments aimed at measuring photoelectron angular distributions of laser-aligned 1-ethynyl-4-fluorobenzene (C8H5F) and dissociating, laser-aligned 1,4-dibromobenzene (C6H4Br2) molecules and discuss them in the larger context of photoelectron diffraction on gas-phase molecules. We also show how the strong nanosecond laser pulse used for adiabatically laser-aligning the molecules influences the measured electron and ion spectra and angular distributions, and discuss how this may affect the outcome of future time-resolved photoelectron diffraction experiments.

Photoelectron Angular Distributions Of Ultrathin NI/CU(001) Films

1996 ◽  
Vol 437 ◽  
Author(s):  
G.J. Mankey ◽  
K. Subramanian ◽  
R.L. Stockbauer ◽  
R.L. Kurtz
Keyword(s):  
Photoelectron Spectroscopy ◽  
Periodic Potential ◽  
Electronic States ◽  
Linear Dichroism ◽  
Angular Distributions ◽  
X Ray ◽  
Photoelectron Diffraction ◽  
Ellipsoidal Mirror ◽  
Magnetic Linear Dichroism ◽  
Photoelectron Angular Distributions

AbstractWe present measurements of the evolution with film thickness of the 3d electronic states at the Fermi energy of ultrathin Ni films. The morphology and thickness of the films is determined from x-ray photoelectron spectroscopy. x-ray photoelectron diffraction and x-ray magnetic linear dichroism using synchrotron radiation. Photoelectron angular distributions were measured using an ellipsoidal mirror analyzer. Even at submonolayer Ni coverages, the 3d electronic states exhibit bulk-like properties. This is attributed to the short screening length of electrons in metals, the localization of the 3d electrons, the similarity of the Ni and Cu ion cores, and finally the interaction with the underlying fcc periodic potential.

scholarly journals Nanosecond laser pulse heating of a platinum surface studied by pump-probe X-ray diffraction

2016 ◽  
Vol 109 (4) ◽  
pp. 043107 ◽  
Author(s):  
Roman Shayduk ◽  
Vedran Vonk ◽  
Björn Arndt ◽  
Dirk Franz ◽  
Jörg Strempfer ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Heating ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
X Ray Diffraction ◽  
Platinum Surface ◽  
Pump Probe ◽  
X Ray ◽  
Laser Pulse Heating

MULTIPLE SCATTERING THEORY OF PHOTOELECTRON ANGULAR DISTRIBUTIONS FROM ORIENTED DIATOMIC MOLECULES

2002 ◽  
Vol 09 (02) ◽  
pp. 1213-1217 ◽  
Author(s):  
R. DÍEZ MUIÑO ◽  
D. ROLLES ◽  
F. J. GARCÍA DE ABAJO ◽  
C. S. FADLEY ◽  
M. A. VAN HOVE
Keyword(s):  
Gas Phase ◽  
Multiple Scattering ◽  
Electron Scattering ◽  
Scattering Theory ◽  
Angular Distributions ◽  
Spherically Symmetric ◽  
Photoelectron Diffraction ◽  
Oriented Molecules ◽  
Scattering Matrices ◽  
Photoelectron Angular Distributions

We use multiple scattering photoelectron diffraction (MSPD) theory to calculate the angular patterns of electrons photoemitted from the K-shell of CO and N 2 gas-phase oriented molecules, as recently measured by several groups. For low (E < 50 eV ) kinetic energies of the photoemitted electron, the electron scattering cannot be adequately represented by spherically symmetric potentials. We thus include nonspherical scattering potentials in our formalism through nondiagonal scattering matrices. We show that intramolecular scattering and interference are responsible for the experimentally measured patterns. This MSPD approach represents a more accurate and versatile method for dealing with such angular distributions as compared to prior calculations of these effects.

Femtosecond x-ray photoelectron diffraction on gas-phase dibromobenzene molecules

2014 ◽  
Vol 47 (12) ◽  
pp. 124035 ◽  
Author(s):  
D Rolles ◽  
R Boll ◽  
M Adolph ◽  
A Aquila ◽  
C Bostedt ◽  
...  
Keyword(s):  
Gas Phase ◽  
X Ray ◽  
Photoelectron Diffraction

scholarly journals Determination of Excited State Molecular Structures from Time-Resolved Gas-Phase X-Ray Scattering

2020 ◽  
Author(s):  
Haiwang Yong ◽  
Andrés Moreno Carrascosa ◽  
Lingyu Ma ◽  
Brian Stankus ◽  
Michael P Minitti ◽  
...  
Keyword(s):  
Excited State ◽  
Gas Phase ◽  
Electronic States ◽  
Molecular Structures ◽  
Excited Electronic States ◽  
Comprehensive Investigation ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering

We present a comprehensive investigation of a recently introduced method to determine transient structures of molecules in excited electronic states with sub-Ångstrom resolution from time-resolved gas-phase scattering signals. The method,...

scholarly journals Time-resolved x-ray/optical pump-probe simulations on N2 molecules

2019 ◽  
Vol 6 (2) ◽  
pp. 024101
Author(s):  
Athiya Mahmud Hanna ◽  
Oriol Vendrell ◽  
Robin Santra
Keyword(s):  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
X Ray

scholarly journals Probing Attosecond Electron Coherence in Molecular Charge Migration by Ultrafast X-Ray Photoelectron Imaging

2019 ◽  
Vol 9 (9) ◽  
pp. 1941 ◽  
Author(s):  
Kai-Jun Yuan ◽  
André D Bandrauk
Keyword(s):  
Electron Dynamics ◽  
Charge Migration ◽  
Photoelectron Imaging ◽  
Time Resolved ◽  
Pump Probe ◽  
New Approach ◽  
X Ray ◽  
Chemistry Research ◽  
Molecular Charge ◽  
Electron Coherence

Electron coherence is a fundamental quantum phenomenon in today’s ultrafast physics and chemistry research. Based on attosecond pump–probe schemes, ultrafast X-ray photoelectron imaging of molecules was used to monitor the coherent electron dynamics which is created by an XUV pulse. We performed simulations on the molecular ion H 2 + by numerically solving time-dependent Schrödinger equations. It was found that the X-ray photoelectron angular and momentum distributions depend on the time delay between the XUV pump and soft X-ray probe pulses. Varying the polarization and helicity of the soft X-ray probe pulse gave rise to a modulation of the time-resolved photoelectron distributions. The present results provide a new approach for exploring ultrafast coherent electron dynamics and charge migration in reactions of molecules on the attosecond time scale.

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