Three‐dimensional velocity analysis combining ion imaging with Doppler spectroscopy: Application to photodissociation of HBr at 243 nm

1992 ◽  
Vol 96 (6) ◽  
pp. 4801-4804 ◽  
Author(s):  
Tohru Kinugawa ◽  
Tatsuo Arikawa
Keyword(s):  
Three Dimensional ◽  
Velocity Analysis ◽  
Ion Imaging ◽  
Doppler Spectroscopy

Ultraviolet photodissociation dynamics of PCl3 at 235 nm: three-dimensional ion imaging and theoretical analysis

2021 ◽  
Author(s):  
Alexei Chichinin ◽  
Christof Maul ◽  
Karl-Heinz Gericke
Keyword(s):  
Theoretical Analysis ◽  
Ground State ◽  
Multiphoton Ionization ◽  
Three Dimensional ◽  
Ion Imaging ◽  
Ultraviolet Photodissociation

The photodissociation dynamics of PCl3 at 235 nm has been studied by monitoring ground state Cl(2P3/2) and spin-orbitally excited Cl(2P1/2) atoms by resonance enhanced multiphoton ionization(REMPI). Also, the PCl+n (n=0,1,2)...

Three-dimensional ion imaging study of PCl3 photodissociation at 235 nm

2020 ◽  
Author(s):  
A.I. Chichinin ◽  
C. Maul ◽  
K.-H. Gericke
Keyword(s):  
Three Dimensional ◽  
Imaging Study ◽  
Ion Imaging

Three-dimensional (3D) velocity map imaging: from technique to application

2022 ◽  
Author(s):  
Gihan Basnayake ◽  
Yasashri Ranathunga ◽  
Suk Kyoung Lee ◽  
Wen Li
Keyword(s):  
Three Dimensional ◽  
Cost Effective ◽  
Velocity Map Imaging ◽  
Imaging Method ◽  
Translational Energy ◽  
Ion Imaging ◽  
Standard Tool ◽  
Recent Advancement ◽  
Acquisition Speed ◽  
Energy And Angular Distributions

Abstract The velocity map imaging (VMI) technique was first introduced by Eppink and Parker in 1997, as an improvement to the original ion imaging method by Houston and Chandler in 1987. The method has gained huge popularity over the past two decades and has become a standard tool for measuring high-resolution translational energy and angular distributions of ions and electrons. VMI has evolved gradually from 2D momentum measurements to 3D measurements with various implementations and configurations. The most recent advancement has brought unprecedented 3D performance to the technique in terms of resolutions (both spatial and temporal), multi-hit capability as well as acquisition speed while maintaining many attractive attributes afforded by conventional VMI such as being simple, cost-effective, visually appealing and versatile. In this tutorial we will discuss many technical aspects of the recent advancement and its application in probing correlated chemical dynamics.

Accuracy study of velocity estimation in 3-D layered models

Geophysics ◽  
1995 ◽  
Vol 60 (5) ◽  
pp. 1567-1574
Author(s):  
Valery Sorin
Keyword(s):  
Three Dimensional ◽  
Velocity Estimation ◽  
Velocity Analysis ◽  
Apparent Velocity ◽  
Velocity Anisotropy ◽  
Strike Direction ◽  
Accuracy Study ◽  
Layer Velocity ◽  
Structure Geometry ◽  
Zero Offset

Velocity estimation is examined in 3-D layered structures formed by plane and curved interfaces. The applied technique of coherency inversion tests the layer velocity through the repeating sequence of ray migration/coherency measurement. The reconstructed velocity‐depth model fits zero‐offset reflection times and maximizes semblance on input common midpoint (CMP) gathers. The correctness of layer velocity analysis disregarding the three‐dimensionality of the structures is under consideration. Using the 2-D coherency inversion technique, velocity is correctly determined in the upper layer of the examined structures. Two‐dimensional analysis in the deeper layer gives biased velocity estimates. The errors in the 2-D velocity estimates vary with the profile azimuth and appear in the form of the apparent velocity anisotropy. The inaccuracy of 2-D velocity estimation is analytically considered for the profile oriented along the refractor strike direction. The derived equation relates the velocity error to structure geometry and to the velocity contrast above and below the refractor. Three‐dimensional velocity analysis in the examined structures reveals that the layer velocity resolution is affected by the refractor shape. Below the convex refractor the velocity resolution deteriorates compared with that below the plane.

Three-dimensional velocity map imaging: Setup and resolution improvement compared to three-dimensional ion imaging

2009 ◽  
Vol 80 (8) ◽  
pp. 083301 ◽  
Author(s):  
S. Kauczok ◽  
N. Gödecke ◽  
A. I. Chichinin ◽  
M. Veckenstedt ◽  
C. Maul ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Velocity Map Imaging ◽  
Ion Imaging ◽  
Resolution Improvement ◽  
Imaging Setup

Construction and calibration of an instrument for three-dimensional ion imaging

2006 ◽  
Vol 125 (13) ◽  
pp. 133503 ◽  
Author(s):  
Konrad Koszinowski ◽  
Noah T. Goldberg ◽  
Andrew E. Pomerantz ◽  
Richard N. Zare
Keyword(s):  
Three Dimensional ◽  
Ion Imaging

IMPROVED STRUCTURAL RESOLUTION FROM 3D SURVEYS IN AUSTRALIA

1982 ◽  
Vol 22 (1) ◽  
pp. 17
Author(s):  
J. I. Sanders ◽  
G. Steel
Keyword(s):  
Three Dimensional ◽  
Velocity Analysis ◽  
Complex Structures ◽  
3D Seismic ◽  
3D Data ◽  
Survey Line ◽  
Line Spacing ◽  
Data Volume ◽  
Marine Seismic ◽  
Gippsland Basin

Two marine seismic three-dimensional (3D) surveys were carried out in the Gippsland Basin during 1980. The results of these surveys illustrate the improved structural resolution that can be obtained by 3D migration in complex areas, and also the great detail with which a structure can be defined by the dense data volume given by a 3D survey.Certain aspects of data collection and processing are particularly critical in achieving a successful 3D survey. Line spacing and depth-point spacing must be related to the maximum dips and reflection frequencies expected, and accurate navigation and streamer positioning are essential. Correct migration of the data is highly dependent on obtaining the proper migration velocities, and these are derived from the stacking velocity analysis by a form of 3D modelling.Sections and Seiscrop' horizontal time slices from the surveys demonstrate that in areas of complex three-dimensional structures, 3D seismic methods are necessary to properly image the reflection energy. The Seiscrop sections also show how the dense spatial sampling of 3D data is required to map these complex structures with adequate resolution for the most effective planning of a drilling programme.

Structural Damage Detection Based on the Wave Velocity Analysis

2012 ◽  
Vol 446-449 ◽  
pp. 196-202
Author(s):  
Yuan Cao Guo ◽  
Guo Shao Hua
Keyword(s):  
Wave Velocity ◽  
Structural Damage ◽  
Damage Identification ◽  
Three Dimensional ◽  
Velocity Analysis ◽  
Two Dimensional ◽  
Structural Damage Detection ◽  
Wave Shape ◽  
Velocity Function ◽  
Interior Damage

The wave velocity analysis is a kind of popular geophysical method. These years it is also used in structural damage identification which is discussed in this paper. This method is used to detect the interior damage of structure and is verified to recognize the damage effectively. The expression of the vertical and horizontal velocity is deduced and the wave velocity function curve is drawn according to velocity variety rule. The two dimensional and three dimensional wave field figure is drawn according to the wave velocity analysis and it shows the distinguish between the damaged and integrated structure. We can see the change of the wave shape and velocity and we can identify the damage in terms of the velocity variety rule. So the method introduced in this paper is verified to be a pontential way to identify the structural damage.

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