scholarly journals X-ray diffractive imaging of controlled gas-phase molecules: Toward imaging of dynamics in the molecular frame

2020 ◽  
Vol 152 (8) ◽  
pp. 084307 ◽  
Author(s):  
Thomas Kierspel ◽  
Andrew Morgan ◽  
Joss Wiese ◽  
Terry Mullins ◽  
Andy Aquila ◽  
...  
Keyword(s):  
Gas Phase ◽  
Diffractive Imaging ◽  
X Ray ◽  
Gas Phase Molecules ◽  
Molecular Frame

scholarly journals X-Ray Diffraction from Isolated and Strongly Aligned Gas-Phase Molecules with a Free-Electron Laser

2014 ◽  
Vol 112 (8) ◽  
Author(s):  
Jochen Küpper ◽  
Stephan Stern ◽  
Lotte Holmegaard ◽  
Frank Filsinger ◽  
Arnaud Rouzée ◽  
...  
Keyword(s):  
Gas Phase ◽  
Free Electron ◽  
Free Electron Laser ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gas Phase Molecules

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.

scholarly journals Accessing the molecular frame through strong-field alignment of distributions of gas phase molecules

2018 ◽  
Vol 376 (2115) ◽  
pp. 20170158 ◽  
Author(s):  
Katharine L. Reid
Keyword(s):  
Gas Phase ◽  
Strong Field ◽  
Laboratory Frame ◽  
Theoretical Chemistry ◽  
Single Parameter ◽  
Gaussian Form ◽  
Gas Phase Molecules ◽  
Photoelectron Angular Distribution ◽  
Complete Set ◽  
Molecular Frame

A rationale for creating highly aligned distributions of molecules is that it enables vector properties referenced to molecule-fixed axes (the molecular frame ) to be determined. In the present work, the degree of alignment that is necessary for this to be achieved in practice is explored. Alignment is commonly parametrized in experiments by a single parameter, , which is insufficient to enable predictive calculations to be performed. Here, it is shown that, if the full distribution of molecular axes takes a Gaussian form, this single parameter can be used to determine the complete set of alignment moments needed to characterize the distribution. In order to demonstrate the degree of alignment that is required to approach the molecular frame, the alignment moments corresponding to a few chosen values of are used to project a model molecular frame photoelectron angular distribution into the laboratory frame. These calculations show that needs to approach 0.9 in order to avoid significant blurring to be caused by averaging. This article is part of the theme issue ‘Modern theoretical chemistry’.

scholarly journals Na-Influenced Bulk and Surface Properties of the So-Called Iota(ι)-Alumina: Spectroscopy and Microscopy Studies

2021 ◽  
Vol 9 ◽  
Author(s):  
Ali Bumajdad ◽  
Shamsun Nahar ◽  
Mohamed I. Zaki
Keyword(s):  
Ir Spectroscopy ◽  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Ex Situ ◽  
Pure Alumina ◽  
X Ray ◽  
Laser Raman ◽  
Gas Phase Molecules ◽  
And Control

The test alumina (the so-called ι-Al2O3) was thermally recovered at 1,100°C from chitosan-AlOx hybrid films and found to contain Na and Ca impurity ions inherited from the parent chitosan. Two different modifications of pure alumina, namely, γ- and α-Al2O3, were adopted as control samples. The test and control aluminas were examined for 1) the bulk elemental constitution by atomic absorption spectroscopy (AAS), 2) the surface chemical composition by X-ray photoelectron spectroscopy (XPS), 3) the bulk phase composition by X-ray powder diffractometry (XRD), ex-situ Fourier-transform infrared spectroscopy (IR), and Laser Raman (LRa) spectroscopy, 4) the surface area, topography, and morphology by N2 sorptiometry, and atomic force (AFM) and scanning electron microscopy (SEM), 5) the surface adsorptive interactions with pyridine and 2-propanol gas-phase molecules by in-situ IR spectroscopy of the adsorbed species, and 6) the surface catalytic interactions with 2-propanol gas-phase molecules by in-situ IR spectroscopy of the gas phase. Results obtained could clearly show that the test alumina (ι-Al2O3) is only hypothetically pure alumina since in reality its bulk structure is majored by mullite-type Na-aluminate (Na0.67Al6O9.33/NaAlO2) and minored by Na-β-alumina (Na1.71Al11O17) and β-alumina (NaAl11O17). Consistently, observed Na-influenced modifications of the surface chemistry, topology, and morphology, as well as adsorptive and catalytic interactions with pyridine and 2-propanol gas-phase molecules, showed significant deviations from those exhibited by the control pure aluminas (γ- and α-Al2O3).

GAS PHASE X-RAY ABSORPTION SPECTROSCOPY WITH AN ELECTRON YIELD DETECTOR

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-149-C8-151
Author(s):  
F. W. LYTLE ◽  
R. B. GREEGOR ◽  
G. H. VIA ◽  
J. M. BROWN ◽  
G. MEITZNER
Keyword(s):  
Gas Phase ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Electron Yield ◽  
X Ray Absorption

A review of molecular effects in gas-phase KL X-ray emission

2013 ◽  
Vol 188 ◽  
pp. 53-61 ◽  
Author(s):  
Renaud Guillemin ◽  
Stéphane Carniato ◽  
Loïc Journel ◽  
Wayne C. Stolte ◽  
Tatiana Marchenko ◽  
...  
Keyword(s):  
Gas Phase ◽  
X Ray ◽  
Molecular Effects

CsOH and its Lighter Homologues – a Comparison

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1229-1236
Author(s):  
Matthias Wörsching ◽  
Constantin Hoch
Keyword(s):  
Gas Phase ◽  
Room Temperature ◽  
Structure Type ◽  
Alkali Metal Hydroxide ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Cesium Hydroxide ◽  
Free Ion ◽  
The One ◽  
First Time

Abstract Cesium hydroxide, CsOH, was for the first time characterised on the basis of single-crystal data. The structure is isotypic to the one of the room-temperature modification of NaOH and can be derived from the NaCl structure type thus allowing the comparison of all alkali metal hydroxide structures. Raman spectroscopic investigations show the hydroxide anion to behave almost as a free ion as in the gas phase. The X-ray investigations indicate possible H atom positions.

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