Modelling and physical interpretation of time-delay differences observed in attosecond-time-resolved photoemission from WSe2 and BiTeCl surfaces (Conference Presentation)

2017 ◽  
Author(s):  
Walter Pfeiffer
Keyword(s):  
Time Delay ◽  
Physical Interpretation ◽  
Time Resolved

Instantaneous contribution in time-resolved four-wave mixing from GaAs quantum wells near zero time delay

1994 ◽  
Vol 50 (20) ◽  
pp. 15086-15094 ◽  
Author(s):  
D. S. Kim ◽  
J. Shah ◽  
T. C. Damen ◽  
Wilfred Schäfer ◽  
L. N. Pfeiffer ◽  
...  
Keyword(s):  
Time Delay ◽  
Quantum Wells ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Time Resolved ◽  
Zero Time

scholarly journals Angular dependence of the Wigner time delay upon tunnel ionization of H2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
D. Trabert ◽  
S. Brennecke ◽  
K. Fehre ◽  
N. Anders ◽  
A. Geyer ◽  
...  
Keyword(s):  
Time Delay ◽  
Light Field ◽  
Strong Field ◽  
Theoretical Data ◽  
Molecular Axis ◽  
Field Ionization ◽  
Strong Light ◽  
Time Resolved ◽  
Tunnel Ionization ◽  
Strong Field Ionization

AbstractWhen a very strong light field is applied to a molecule an electron can be ejected by tunneling. In order to quantify the time-resolved dynamics of this ionization process, the concept of the Wigner time delay can be used. The properties of this process can depend on the tunneling direction relative to the molecular axis. Here, we show experimental and theoretical data on the Wigner time delay for tunnel ionization of H2 molecules and demonstrate its dependence on the emission direction of the electron with respect to the molecular axis. We find, that the observed changes in the Wigner time delay can be quantitatively explained by elongated/shortened travel paths of the emitted electrons, which occur due to spatial shifts of the electrons’ birth positions after tunneling. Our work provides therefore an intuitive perspective towards the Wigner time delay in strong-field ionization.

Multi-Time-Delay LSE-POD Complementary Approach Applied to Wake Flow Behind a Bluff Body

2007 ◽  
Author(s):  
Vibhav Durgesh ◽  
Jonathan W. Naughton
Keyword(s):  
Time Delay ◽  
Surface Pressure ◽  
Bluff Body ◽  
Wake Flow ◽  
Time Varying ◽  
Pressure Measurements ◽  
Near Wake ◽  
Time Resolved ◽  
Complementary Approach ◽  
The Time Domain

An understanding of the near wake dynamics of a bluff body is desired to better link base drag reduction observed on these bodies with the coherent structures in the wake. This investigation explores different Linear Stochastic Estimation-Proper Orthogonal Decomposition (LSE-POD) methods that can be employed to estimate the dynamics of the energy containing structure. Statistically independent two-dimensional PIV measurements and time-resolved surface pressure measurements are used to determine spatial POD modes and LSE coefficients for estimating the time-varying POD coefficients using measured surface pressures. These results are used with the time-resolved surface pressure measurements to estimate the time-varying POD coefficients that may be used for a low-order, time-resolved reconstruction of the flow field. The multi-time LSE approach formulated in the time domain (multi-time-delay LSE) is found to be successful in capturing the important near wake dynamics.

scholarly journals Use of a Novel Homogeneous Fluorescent Technology in High Throughput Screening

1996 ◽  
Vol 1 (4) ◽  
pp. 203-210 ◽  
Author(s):  
Janet M. Kolb ◽  
Gregory Yamanaka ◽  
Susan P. Manly
Keyword(s):  
Time Delay ◽  
High Throughput ◽  
High Throughput Screening ◽  
Time Resolved Fluorescence ◽  
Reaction Conditions ◽  
Time Resolved ◽  
Attractive Candidate ◽  
Endogenous Fluorescence ◽  
High Throughput Screens ◽  
Fluorescent Compounds

A new fluorescent technology called homogeneous time-resolved fluorescence (HTRF) is sensitive, homogeneous, and quite tolerant to extremes in reaction conditions. These characteristics make this technique an attractive candidate for use in high throughput screens. The assay system uses a pair of fluorescent compounds to label biomolecules. The long-lived nature of the fluorescence of one of them, europium cryptate, facilitates the homogeneous nature of the assay. Furthermore, the introduction of a time delay in reading the signal eliminates the principal difficulty in applying fluorescence to screening formats, that of endogenous fluorescence of samples tested (especially natural products). This technique is robust and sensitive, and we report here its utility in a high throughput screening format.

scholarly journals Wavelet-based time-delay estimation for time-resolved turbulent flow analysis

2001 ◽  
Vol 72 (1) ◽  
pp. 996-999 ◽  
Author(s):  
M. Jakubowski ◽  
R. J. Fonck ◽  
C. Fenzi ◽  
G. R. McKee
Keyword(s):  
Time Delay ◽  
Turbulent Flow ◽  
Flow Analysis ◽  
Time Delay Estimation ◽  
Delay Estimation ◽  
Time Resolved

scholarly journals On physical interpretation of two dimensional time-correlations regarding time delay velocities and eddy shaping

2012 ◽  
Vol 19 (12) ◽  
pp. 122302 ◽  
Author(s):  
N. Fedorczak ◽  
P. Manz ◽  
S. C. Thakur ◽  
M. Xu ◽  
G. R. Tynan ◽  
...  
Keyword(s):  
Time Delay ◽  
Physical Interpretation ◽  
Two Dimensional ◽  
Time Correlations

Time resolved electronic spectroscopy. I. Bimolecular rates for excimer formation

1969 ◽  
Vol 22 (1) ◽  
pp. 9 ◽  
Author(s):  
R Speed ◽  
r Selinge
Keyword(s):  
Time Delay ◽  
Fluorescence Intensity ◽  
Electronic Spectroscopy ◽  
Flash Duration ◽  
Time Resolved ◽  
Excimer Fluorescence ◽  
Low Viscosity ◽  
Diffusion Controlled ◽  
Excimer Formation ◽  
Bimolecular Quenching

The time delay in the build-up of excimer fluorescence for solutions of pyrene affords a means of testing the assumption that bimolecular quenching of fluorescence is diffusion-controlled. It appears that in solvents of low viscosity this is no longer the case. An apparatus is described with which measurements of fluorescence intensity at nanosecond intervals can be made using a simple versatile high- intensity lamp of short flash duration.

scholarly journals Orientation-dependent stereo Wigner time delay and electron localization in a small molecule

Science ◽  
2018 ◽  
Vol 360 (6395) ◽  
pp. 1326-1330 ◽  
Author(s):  
J. Vos ◽  
L. Cattaneo ◽  
S. Patchkovskii ◽  
T. Zimmermann ◽  
C. Cirelli ◽  
...  
Keyword(s):  
Quantum Mechanics ◽  
Time Delay ◽  
Theoretical Calculations ◽  
Photoelectric Effect ◽  
Excited Electron ◽  
Electron Localization ◽  
Electron Wave ◽  
Time Resolved ◽  
Electron Wave Packet ◽  
Molecular Potential

Attosecond metrology of atoms has accessed the time scale of the most fundamental processes in quantum mechanics. Transferring the time-resolved photoelectric effect from atoms to molecules considerably increases experimental and theoretical challenges. Here we show that orientation- and energy-resolved measurements characterize the molecular stereo Wigner time delay. This observable provides direct information on the localization of the excited electron wave packet within the molecular potential. Furthermore, we demonstrate that photoelectrons resulting from the dissociative ionization process of the CO molecule are preferentially emitted from the carbon end for dissociative 2Σ states and from the center and oxygen end for the 2Π states of the molecular ion. Supported by comprehensive theoretical calculations, this work constitutes a complete spatially and temporally resolved reconstruction of the molecular photoelectric effect.

Application of Time-of-Flight Near-Infrared Spectroscopy to Wood with Anisotropic Cellular Structure

2002 ◽  
Vol 56 (7) ◽  
pp. 869-876 ◽  
Author(s):  
Satoru Tsuchikawa ◽  
Shigeaki Tsutsumi
Keyword(s):  
Infrared Spectroscopy ◽  
Time Delay ◽  
Near Infrared Spectroscopy ◽  
Measurement System ◽  
Cellular Structure ◽  
Near Infrared ◽  
Time Of Flight ◽  
Sample Thickness ◽  
Optical Parameters ◽  
Time Resolved

The newly constructed optical measurement system, which was mainly composed of a parametric tunable laser and a near-infrared photoelectric multiplier, was introduced to clarify the optical characteristics of wood with anisotropic cellular structure on the basis of the time-of-flight near-infrared spectroscopy (TOF-NIRS). The combined effects of the cellular structure of the wood sample, the wavelength of the laser beam, and the detection position of transmitted light on the time-resolved profiles were investigated in detail. The substantial optical pathlength calculated from the time-resolved profile was outstandingly larger than the sample thickness. The substance of the wood was directly related to the time delay of light propagation. In applying TOF-NIRS to the cellular structural materials, it is very important to give attention to the difference in the light scattering within the cell wall and that caused by the multiple specular-like reflections between cell walls. The newly proposed empirical equation, considering the effects of optical parameters, could well express the wavelength and sample thickness dependency of the time delay of the peak maxima. The time-resolved profile was intensively governed by the combination of light-absorbing and -scattering conditions and the degree of anisotropy. These basic data will be essential for this system to put an in-process measurement system in the wood industry to practical use.

Spectroscopic Investigations of the Ablation Plume of Several Inorganic Materials

1992 ◽  
Vol 285 ◽  
Author(s):  
A. Rosenfeld ◽  
R. Mitzner ◽  
R. Konig
Keyword(s):  
Time Delay ◽  
Dimensional Space ◽  
Broad Band ◽  
Inorganic Materials ◽  
Ablation Plume ◽  
Atmospheric Conditions ◽  
Time Resolved ◽  
Temporal Behaviour ◽  
Space Resolution ◽  
Spectroscopic Investigations

ABSTRACTTime resolved absorption spectroscopic investigations of the KrF laser ablation of MgO-ceramics and sapphire on atmospheric conditions were carried out with a time resolution of about 5 ns and a two-dimensional space resolution of less than 100 μm. The time delay between the ablation pulse and the broad band probe pulse was varied from 10 ns up to 10 μs.Absolute particle densities of the species were determined in dependence on the time delay and on the distance to the surface. The spatial and temporal behaviour of the particles in the ablation plume near the surface was found to be strongly affected both by air atmosphere and the reaction dynamic in the plasma zone. In the case of sapphire the time evolution of the densities of Al, Al+ and AlO species are discussed in comparison to measurements on vacuum conditions.

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