Temperature-Dependent Formation of Acetophenone Oligomers Accompanied by Keto–Enol Tautomerism: Real Space Distribution

2020 ◽  
Vol 124 (26) ◽  
pp. 14262-14271 ◽  
Author(s):  
Marvin C. Schmidt ◽  
Smadar Attia ◽  
Carsten Schröder ◽  
Ann-Katrin Baumann ◽  
Pascal Pessier ◽  
...  
Keyword(s):  
Real Space ◽  
Space Distribution ◽  
Temperature Dependent

D-WAVE CHECKERBOARD BOSE CONDENSATE OF MOBILE BIPOLARONS

2007 ◽  
Vol 21 (13n14) ◽  
pp. 2301-2312 ◽  
Author(s):  
A. S. ALEXANDROV
Keyword(s):  
Particle Density ◽  
Center Of Mass ◽  
Bose Condensate ◽  
Real Space ◽  
Temperature Dependent ◽  
Finite Center ◽  
Electron Phonon Interaction ◽  
Single Particle Density ◽  
Wave Symmetry ◽  
D Wave

Strong finite-range electron-phonon interaction (EPI) bounds carriers into small mobile bipolarons. The Bogoliubov-de Gennes (BdG) equations are formulated and solved in the strong-coupling limit, when small bipolarons bose-condense with finite center-of-mass momentum, K ≠ 0. There are two energy scales in this regime, a temperature independent incoherent gap Δp and a temperature dependent coherent gap Δc(T, R) modulated in the real space, R. The order parameter has d-wave symmetry in R-space and the single-particle density of states (DOS) reveals checkerboard modulations similar to the checkerboard tunnelling DOS observed in cuprates.

scholarly journals Tracing orbital images on ultrafast time scales

Science ◽  
2021 ◽  
pp. eabf3286
Author(s):  
R. Wallauer ◽  
M. Raths ◽  
K. Stallberg ◽  
L. Münster ◽  
D. Brandstetter ◽  
...  
Keyword(s):  
Momentum Space ◽  
Real Space ◽  
Space Distribution ◽  
Time Resolved ◽  
Pump Probe ◽  
High Laser ◽  
Probe Experiment ◽  
Electron Distributions ◽  
Space Dynamics ◽  
Pump Probe Experiment

Frontier orbitals determine fundamental molecular properties such as chemical reactivities. Although electron distributions of occupied orbitals can be imaged in momentum space by photoemission tomography, it has so far been impossible to follow the momentum-space dynamics of a molecular orbital in time, for example through an excitation or a chemical reaction. Here, we combined time-resolved photoemission using high laser harmonics and a momentum microscope to establish a tomographic, femtosecond pump-probe experiment of unoccupied molecular orbitals. We measured the full momentum-space distribution of transiently excited electrons, connecting their excited-state dynamics to real-space excitation pathways. Because in molecules this distribution is closely linked to orbital shapes, our experiment may in the future offer the possibility to observe ultrafast electron motion in time and space.

Energy-filtered electron diffraction from amorphized solids in the dedicated scanning transmission electron microscope (STEM)¶

1996 ◽  
Vol 54 ◽  
pp. 702-703
Author(s):  
A. N. Sreeram ◽  
L.-C. Qin ◽  
A. J. Garratt-Reed ◽  
L. W. Hobbs
Keyword(s):  
Electron Diffraction ◽  
Diffraction Data ◽  
Scanning Transmission Electron Microscope ◽  
Real Space ◽  
Distribution Functions ◽  
Space Distribution ◽  
Electron Diffraction Data ◽  
X Rays ◽  
Transmission Electron ◽  
Scanning Transmission

There is significant current interest in understanding the structure of aperiodic solids, such as originally crystalline material amorphized by ion implantation, impact or application of massive pressures, or deposited amorphous thin films, which occupy small volumes. Radially-averaged real-space distribution functions can be derived from diffraction data, the best of which come from thermal neutron diffraction, which inconveniently requires large volumes. Neutron data are collectable in reciprocal space out to q ≡ 2sin(Θ/2)/λ = 70 nm-1, where Θ is the scattering angle and λ the wavelength, or about twice as far as for X-rays, which also require large diffracting volumes. Electron diffraction is the only recourse for very small volumes because of the much stronger interaction of the electron, but spectra must be energy filtered to remove the large inelastic scattering component. Recently, it has been shown that useful electron diffraction data can be collected conveniently to at least q = 16 nm-1 in the VG HB5 dedicated 100-kV field-emission STEM. This contribution details our experiences with improved collection in the VG HB603 instrument operating at 250 kV.

Real-Space Distribution of Local WO4 Ordering in Negative Thermal Expansive ZrW2O8

2012 ◽  
Vol 134 (34) ◽  
pp. 13942-13945 ◽  
Author(s):  
Yukio Sato ◽  
Yasuhisa Yamamura ◽  
Kazuya Saito ◽  
Yuichi Ikuhara
Keyword(s):  
Real Space ◽  
Space Distribution

scholarly journals Structure retrieval in liquid-phase electron scattering

2021 ◽  
Author(s):  
Jie Yang ◽  
J. Pedro F. Nunes ◽  
Kathryn Ledbetter ◽  
Elisa Biasin ◽  
Martin Centurion ◽  
...  
Keyword(s):  
Charged Particle ◽  
Liquid Phase ◽  
Electron Scattering ◽  
Real Space ◽  
Space Distribution ◽  
Analysis Method ◽  
The Real ◽  
Particle Pairs

A novel analysis method for the direct retrieval of the real-space distribution of charged particle pairs from liquid-phase electron scattering.

Atomic resolution imaging using the real-space distribution of electrons scattered by a crystalline material

2011 ◽  
Vol 67 (5) ◽  
pp. 487-490 ◽  
Author(s):  
Sorin Lazar ◽  
Joanne Etheridge ◽  
Christian Dwyer ◽  
Bert Freitag ◽  
Gianluigi A. Botton
Keyword(s):  
Real Space ◽  
Crystalline Material ◽  
Atomic Resolution ◽  
Space Distribution ◽  
The Real ◽  
Resolution Imaging

scholarly journals Effect of Low Sodium, Tetrodotoxin, and Temperature Variation upon Excitation

1968 ◽  
Vol 51 (5) ◽  
pp. 621-634 ◽  
Author(s):  
Rita Guttman ◽  
Keyword(s):  
Inhibitory Effect ◽  
Real Space ◽  
Temperature Dependent ◽  
Short Pulses ◽  
Low Sodium ◽  
Constant Quantity ◽  
Hypothetical System ◽  
Duration Relationship ◽  
Relationship Of ◽  
Minimum Intensity

The lowering of external sodium raised both the constant quantity threshold, Qo, and the rheobase, Io, in both real space-clamped squid axons and the theoretical axon as computed on the basis of the standard Hodgkin-Huxley equations. In both real and theoretical axons the minimum intensity for excitability for short pulses, which occurs at about 15°C, was still present when low sodium replaced seawater. Low sodium did not affect the temperature dependence of the strength-duration relationship in the range, 5° to 25°C. The excitability of tetrodotoxin-treated real axons was found to be more temperature-dependent than that of normal real axons. Also the data on dosage-response to TTX of real axons fit the dose-response relationship of a hypothetical system in which one TTX ion binds reversibly to its receptor to produce a fraction of the inhibitory effect, the curve being identical to a simple adsorption isotherm. The Hodgkin-Huxley equations describe the broad outline of events occurring during excitation quite well.

Formation and Real-Space Distribution of Acetophenone Dimers on H-containing Pt(111)

2021 ◽  
Vol 125 (35) ◽  
pp. 19311-19324
Author(s):  
Marvin C. Schmidt ◽  
Smadar Attia ◽  
Carsten Schröder ◽  
Ann-Katrin Baumann ◽  
Swetlana Schauermann
Keyword(s):  
Real Space ◽  
Space Distribution
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