Angular-resolved studies of fragmentation in fullerene-fullerene collisions

Glotov, A. V.; Campbell, Eleanor E. B.

doi:10.1103/physreva.62.033202

Cited by 16 publications

(22 citation statements)

References 25 publications

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“…0.02Å 2 but with rather large error bars due to the low signals and complexity of the data analysis). Our recent measurements were able to show that the abrupt drop at just below 200 eV seen in the early measurements was due mainly to a change in fragmentation behaviour (from C 2 evaporation to the break-up of the cage into larger chain and ring fragments), leading to increased scattering, [4], as had been suggested to explain the original measurements [7]. The data have been compared to two simple phenomenological models in Fig.…”

Section: Resultsmentioning

confidence: 96%

“…Fusion was defined in the calculations as having occurred when a product larger than the projectile and target masses was present at the end of a trajectory calculation (2 ps). This method is likely to underestimate the theoretical fusion cross section at high collision energies > 250 eV [4]) where all fragments are small non-fullerene-like rings and chains, however, it should be reliable for the plotted data that all lie below this collision energy. The agreement with the experimental data is extremely good.…”

Section: Resultsmentioning

confidence: 96%

“…The experimental apparatus has been described in detail before [3,4] and will be described only briefly here. A positively charged fullerene ion beam is produced in the source vacuum chamber by evaporating fullerene powder from an oven at a temperature of about 500 • C and ionising by electron impact.…”

Section: Methodsmentioning

confidence: 99%

“…Our early experiments considered only the reaction products within a small scattering angle range about 0 • [7,6]. The more recent work has concentrated on the scattering angle dependence of the fragmentation [4] and charge transfer [2] products and is able to provide considerable insight into the collision dynamics as well as to confirm the earlier interpretations in terms of simple models. These results indicated that the earlier work had underestimated the magnitude of the fusion cross sections because of scattering of the product out of the detection window due to multiple unimolecular dissociation reactions on a timescale of up to microseconds after the collision.…”

Section: Introductionmentioning

confidence: 91%

“…In our laboratory we have been studying fullerene-fullerene collisions in the intermediate collision energy regime (50-5000 eV) where a number of competing reaction channels occur: scattering [2], fusion [3][4][5], evaporation, (multi-)fragmentation [4] and charge transfer [2,6]. The fusion reaction channel is particularly interesting since there are many similarities but also some important differences compared to the dynamics of nuclear collisions [7].…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Molecular fusion of fullerenes

Glotov

Knospe

Schmidt

et al. 2001

The European Physical Journal D

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New experimental data is reported for the absolute cross sections for the fusion reaction channel in single gas-phase collisions between fullerenes. The experimental data is compared with the results of quantum mechanical and classical molecular dynamics simulations as well as with simple models. Quantum molecular dynamics simulations are in very good quantitative agreement with the experimental data. The overall dynamical behaviour can be well-described qualitatively in the framework of simple models.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Molecular fusion of fullerenes

Glotov

Knospe

Schmidt

et al. 2001

The European Physical Journal D

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Experimental Techniques

Fullerene Collision Reactions

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Spectroscopy of isolated biomolecular ions in vacuo has within the last decade or so become a highly active research field, both for experimentalists and theorists, made possible by the development of advanced instrumental apparatus and the steady increase in more powerful computers. The field is highly interdisciplinary including researchers in chemistry, physics, and molecular biology. Absorption spectra of isolated ions shed light on the intrinsic electronic structures without perturbations from say water molecules, counter ions, nearby charges, or polar amino acids. A comparison with spectra of the chromophores in their natural environment then allows one to identify possible perturbations. Spectra at the same time provide important benchmarks for quantum chemical calculations of electronically excited states, which is still a non-trivial task. Not only absorption spectra but also fluorescence spectra are excellent indicators of environmental effects. In this volume, we focus on spectroscopy of protein chromophores, amino acids and peptides, to whole proteins and DNA nucleotides and oligonucleotides. Dissociation channels and timescales for deexcitation and dissociation are also discussed in detail, as they shed important light on energy-flow processes within the isolated biomolecular ion; indeed, small molecular ions with few degrees of freedom are destined to break apart after photoexcitation due to the absence of a heat bath (energy sink). As all systems included here are ionic, mass spectrometry in combination with lasers are used for the experiments. Experimental techniques to measure spectra and theoretical methods commonly employed are described with a discussion on limitations and advantages.Our book comprises 11 chapters each written by one or more experts in the topic. The book is organised as follows: At the beginning of the book, even before the General Introduction, there are explanatory pages (Concepts) for non-experts in the field where we briefly describe electric-and magnetic-field sectors used as ion deflectors, photophysical processes illustrated by Jablonski diagrams, molecular orbital theory, solvatochromic shifts of electronic transitions, peptide and nucleic acids structures, and nomenclature regarding peptide fragmentation. Our hope is that with these sections, the book shows potential to be used for graduate teaching courses in photobiology and not just for researchers within the field. The second chapter is a brief introduction by one of us (Brøndsted Nielsen) discussing v

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Collision Induced Dissociation

Fullerene Collision Reactions

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Angular-resolved studies of fragmentation in fullerene-fullerene collisions

Cited by 16 publications

References 25 publications

Molecular fusion of fullerenes

Molecular fusion of fullerenes

Experimental Techniques

Collision Induced Dissociation

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