Dynamics of Elementary Termolecular Reactions and Cluster Fragmentation

2000 ◽  
Author(s):  
Robert E. Continetti
Keyword(s):  
Cluster Fragmentation

scholarly journals On the scaling of fragmentation and energy dissipation in collisions of dust aggregates

2021 ◽  
Vol 23 (2) ◽  
Author(s):  
Philipp Umstätter ◽  
Herbert M. Urbassek
Keyword(s):  
Energy Dissipation ◽  
Collision Energy ◽  
Velocity Range ◽  
Collision Velocity ◽  
Granular Mechanics ◽  
Extra Factor ◽  
Cluster Fragmentation ◽  
Silica Clusters ◽  
Large Clusters ◽  
Small Clusters

Abstract Fragmentation of granular clusters may be studied by experiments and by granular mechanics simulation. When comparing results, it is often assumed that results can be compared when scaled to the same value of $$E/E_{\mathrm{sep}}$$ E / E sep , where E denotes the collision energy and $$E_{\mathrm{sep}}$$ E sep is the energy needed to break every contact in the granular clusters. The ratio $$E/E_{\mathrm{sep}}\propto v^2$$ E / E sep ∝ v 2 depends on the collision velocity v but not on the number of grains per cluster, N. We test this hypothesis using granular-mechanics simulations on silica clusters containing a few thousand grains in the velocity range where fragmentation starts. We find that a good parameter to compare different systems is given by $$E/(N^{\alpha }E_{\mathrm{sep}})$$ E / ( N α E sep ) , where $$\alpha \sim 2/3$$ α ∼ 2 / 3 . The occurrence of the extra factor $$N^{\alpha }$$ N α is caused by energy dissipation during the collision such that large clusters request a higher impact energy for reaching the same level of fragmentation than small clusters. Energy is dissipated during the collision mainly by normal and tangential (sliding) forces between grains. For large values of the viscoelastic friction parameter, we find smaller cluster fragmentation, since fragment velocities are smaller and allow for fragment recombination. Graphic abstract

Competition between cluster fragmentation, C–C bond coupling and C–X bond activation in silver hexynyl cluster cations, [(C4H9CCAg)nAg]+. Size does matter!

2009 ◽  
Vol 11 (21) ◽  
pp. 4132 ◽  
Author(s):  
Farrah Qiuyun Wang ◽  
George N. Khairallah ◽  
George A. Koutsantonis ◽  
Craig M. Williams ◽  
Damien L. Callahan ◽  
...  
Keyword(s):  
Bond Activation ◽  
Cluster Fragmentation

On Microscopic Insights into Metal Cluster Fragmentation

1999 ◽  
pp. 511-520
Author(s):  
F. Calvayrac ◽  
A. Domps ◽  
E. Suraud ◽  
P. G. Reinhard ◽  
C. A. Ullrich
Keyword(s):  
Metal Cluster ◽  
Cluster Fragmentation

STATUS OF FRAGMENTATION MODELS

1988 ◽  
Vol 03 (04) ◽  
pp. 751-823 ◽  
Author(s):  
TORBJÖRN SJÖSTRAND
Keyword(s):  
High Energy Physics ◽  
High Energy ◽  
Multiparticle Production ◽  
Theoretical Understanding ◽  
Strong Ties ◽  
Recent Developments ◽  
Hadronization Process ◽  
Cluster Fragmentation ◽  
String Fragmentation ◽  
Energy Physics

Phenomenological models of multiparticle production have become increasingly important for the interpretation of experimental data in high energy physics. The evolution of these models fills a gap left open by the present limited theoretical understanding of the hadronization process, i.e. the transformation of outgoing colored partons into color singlet hadrons. The three main schools of thought, string fragmentation, cluster fragmentation and independent fragmentation, are presented in this paper. Included are discussions on similarities and differences, successes and failures, and recent developments. Perturbative QCD aspects with strong ties to the multiparticle production picture are also covered, in particular parton showers. An account is given of experience gained in the comparison between data and models. Since fragmentation studies are particularly well developed for e+e− annihilation events, this field is described in detail. A few comments are also presented for leptoproduction and hadron collisions.

Cluster fragmentation in electrolyte induced aggregation of latex

1990 ◽  
Vol 92 (5) ◽  
pp. 3112-3117 ◽  
Author(s):  
E. Pefferkorn ◽  
S. Stoll
Keyword(s):  
Cluster Fragmentation ◽  
Induced Aggregation

Spectroscopy and relaxation dynamics of I2Arn clusters. Geminate recombination and cluster fragmentation

1992 ◽  
Vol 97 (9) ◽  
pp. 6057-6063 ◽  
Author(s):  
Suli Fei ◽  
Xiaonan Zheng ◽  
Michael C. Heaven ◽  
Joel Tellinghuisen
Keyword(s):  
Geminate Recombination ◽  
Relaxation Dynamics ◽  
Cluster Fragmentation

Coherent control of alkali cluster fragmentation dynamics

2003 ◽  
Vol 58 (6) ◽  
pp. 1109-1124 ◽  
Author(s):  
Albrecht Lindinger ◽  
Cosmin Lupulescu ◽  
Andreas Bartelt ◽  
Štefan Vajda ◽  
Ludger Wöste
Keyword(s):  
Coherent Control ◽  
Fragmentation Dynamics ◽  
Cluster Fragmentation
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