Translational Energy Distributions for Dissociation of the van der Waals Cation Species (C6H6···Arn)+(n= 1,2) Measured by Velocity Map Imaging†

2000 ◽  
Vol 104 (45) ◽  
pp. 10328-10335 ◽  
Author(s):  
Jason R Gascooke ◽  
Warren D Lawrance
Keyword(s):  
Van Der Waals ◽  
Velocity Map Imaging ◽  
Translational Energy ◽  
Energy Distributions

Scattering of Low-Energy (5-12 eV) C2D4•+ Ions from Room-Temperature Carbon Surfaces

2008 ◽  
Vol 73 (6-7) ◽  
pp. 755-770 ◽  
Author(s):  
Andriy Pysanenko ◽  
Ján Žabka ◽  
Zdeněk Herman
Keyword(s):  
Survival Probability ◽  
Room Temperature ◽  
Incident Angle ◽  
Pyrolytic Graphite ◽  
Carbon Surface ◽  
Translational Energy ◽  
Energy Distributions ◽  
Surface Mass ◽  
Fragment Ions ◽  
Product Ions

The scattering of the hydrocarbon radical cation C2D4•+ from room-temperature carbon (highly oriented pyrolytic graphite, HOPG) surface was investigated at low incident energies of 6-12 eV. Mass spectra, angular and translational energy distributions of product ions were measured. From these data, information on processes at surfaces, absolute ion survival probability, and kinematics of the collision was obtained. The projectile ion showed both inelastic, dissociative and reactive scattering, namely the occurrence of H-atom transfer reaction with hydrocarbons present on the room-temperature carbon surface. The absolute survival probability of the ions for the incident angle of 30° (with respect to the surface) decreased from about 1.0% (16 eV) towards zero at incident energies below 10 eV. Estimation of the effective surface mass involved in the collision process led to m(S)eff of about 57 a.m.u. for inelastic non-dissociative collisions of C2D4•+ and of about 115 a.m.u. for fragment ions (C2D3+, C2D2•+) and ions formed in reactive surface collisions (C2D4H+, C2D2H+, contributions to C2D3+ and C2D2•+). This suggested a rather complex interaction between the projectile ion and the hydrocarbon-covered surface during the collision.

Charge Transfer Between CO22+ and Ar or Ne at Collision Energies 3-10 eV

2003 ◽  
Vol 68 (1) ◽  
pp. 178-188 ◽  
Author(s):  
Libor Mrázek ◽  
Ján Žabka ◽  
Zdeněk Dolejšek ◽  
Zdeněk Herman
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ground State ◽  
Scattering Method ◽  
Translational Energy ◽  
Centre Of Mass ◽  
Energy Distributions ◽  
Zener Model ◽  
Beam Scattering ◽  
Product Ions

The beam scattering method was used to investigate non-dissociative single-electron charge transfer between the molecular dication CO22+ and Ar or Ne at several collision energies between 3-10 eV (centre-of-mass, c.m.). Relative translational energy distributions of the product ions showed that in the reaction with Ar the CO2+ product was mainly formed in reactions of the ground state of the dication, CO22+(X3Σg-), leading to the excited states of the product CO2+(A2Πu) and CO2+(B2Σu+). In the reaction with Ne, the largest probability had the process from the reactant dication excited state CO22+(1Σg+) leading to the product ion ground state CO2+(X2Πg). Less probable were processes between the other excited states of the dication CO22+, (1∆g), (1Σu-), (3∆u), also leading to the product ion ground state CO2+(X2Πg). Using the Landau-Zener model of the reaction window, relative populations of the ground and excited states of the dication CO22+ in the reactant beam were roughly estimated as (X3Σg):(1∆g):(1Σg+):(1Σu-):(3∆u) = 1.0:0.6:0.5:0.25:0.25.

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.

Existence of two internal energy distributions in jet-formed van der Waals heteroclusters: example of the anthracene–argon system

1998 ◽  
Vol 239 (1-3) ◽  
pp. 151-175 ◽  
Author(s):  
D. Uridat ◽  
V. Brenner ◽  
I. Dimicoli ◽  
J. Le Calvé ◽  
P. Millié ◽  
...  
Keyword(s):  
Internal Energy ◽  
Van Der Waals ◽  
Energy Distributions

Dynamics of ethylene photodissociation from rovibrational and translational energy distributions of H2products

1992 ◽  
Vol 97 (6) ◽  
pp. 4029-4040 ◽  
Author(s):  
Evan F. Cromwell ◽  
Albert Stolow ◽  
Marcus J. J. Vrakking ◽  
Yuan T. Lee
Keyword(s):  
Translational Energy ◽  
Energy Distributions
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