Energetics of C+16 to C+36 photodissociation

Bouyer, R.; Roussel, F.; Monchicourt, P.; Perdrix, M.; Pradel, Pierre

doi:10.1063/1.466695

Cited by 18 publications

(18 citation statements)

References 26 publications

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“…This is perhaps not too surprising because previous work has long suggested that this is the most abundant molecule in the vapor above carbon in a vacuum, 1,5 and it is well known that C 3 is a stable neutral fragment in the 11 decomposition of small carbon clusters. [23][24][25][26][27][28][29][30] However, ours is the first experiment with photon energies great enough to detect the small carbon clusters produced in such a laser vaporization experiment. It is also interesting that we detect only a very small intensity for C 2 + .…”

Section: Resultsmentioning

confidence: 99%

“…For example, both C 5 + and C 6 + species produce C 3 + via fragmentation. [23][24][25][26][27][28][29][30] However, the thresholds for these fragmentation processes lie at 4-5 eV, 30 and so these processes could not contribute to the C 3 + channel until the photon energy is at least this far above the ionization thresholds of these clusters. As we show below, the ionization thresholds for C 5 and C 6 lie in the 9.5-10.0 eV range, and therefore one photon ionization accompanied by fragmentation would not be expected until photon energies above about 14 eV.…”

Section: Theoretical Methodsmentioning

confidence: 99%

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Ionization Thresholds of Small Carbon Clusters: Tunable VUV Experiments and Theory

et al. 2007

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Small carbon clusters (C n , n=2-15) are produced in a molecular beam by pulsed laser vaporization and studied with vacuum ultraviolet (VUV) photoionization mass spectrometry.The required VUV radiation in the 8-12 eV range is provided by the Advanced Light Source (ALS) at the Lawrence Berkeley National Laboratory. Mass spectra at various ionization energies reveal the qualitative relative abundances of the neutral carbon clusters produced. By far the most abundant species is C 3 . Using the tunability of the ALS, ionization threshold spectra are recorded for the clusters up to 15 atoms in size. The ionization thresholds are compared to those measured previously with charge transfer bracketing methods. To interpret the ionization thresholds for different cluster sizes, new ab initio calculations are carried out on the clusters for n=4-10. Geometric structures are optimized at the CCSD(T) level with cc-pVTZ (or cc-pVDZ) basis sets, and focal point extrapolations are applied to both neutral and cation species to 2 determine adiabatic and vertical ionization potentials. The comparison of computed and measured ionization potentials makes it possible to investigate the isomeric structures of the neutral clusters produced in this experiment. The measurements are inconclusive for the n=4-6 species because of unquenched excited electronic states. However, the data provide evidence for the prominence of linear structures for the n = 7, 9, 11, 13 species and the presence of cyclic C 10 .

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Section: Resultsmentioning

confidence: 99%

Section: Theoretical Methodsmentioning

confidence: 99%

Ionization Thresholds of Small Carbon Clusters: Tunable VUV Experiments and Theory

et al. 2007

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“…The decay of excited small carbon clusters has been experimentally widely studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In these experiments, the loss of neutral C 3 has been found to be the dominant dissociation process for both charged and neutral clusters.…”

Section: Introductionmentioning

confidence: 99%

Ionization potentials, dissociation energies and statistical fragmentation of neutral and positively charged small carbon clusters

Díaz‐Tendero¹,

Sánchez‐Sanz²,

Hervieux³

et al. 2006

Braz. J. Phys.

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Dissociation energies, ionization potentials and fragmentation dynamics of neutral, singly-and doubly charged small carbon clusters have been theoretically studied with a combination of the density functional theory, the coupled cluster method and the the statistical model microcanonical Metropolis Monte Carlo. The second ionization potential decreases with the cluster size and is larger than the first one, which also decreases with the size showing oscillations. Dissociation energies also oscillate with the cluster size, being those with an odd number of atoms more stable. C 3 cluster has the largest dissociation energy. The combination of a statistical treatment for the cluster fragmentation with experimental results has allowed us to evaluate the energy distribution in collisions experiments.

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“…The experimental set-up is essentially the same as that described in ref. 23. It is shown schematically in Fig.…”

Section: Methodsmentioning

confidence: 99%

Collisions of Fe+ ions, clusters and hydroxides ligated by water molecules

Pradel¹,

Poisson²,

Visticot³

et al. 1997

Faraday Trans.

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A laser evaporation source has been used to generate a beam of Fe`, FeOH`, FeH`, and ions solvated by Fe(OH) 2 `, F e 2 `Fe 3 ùp to 11 water molecules, with the major series of ions corresponding to clusters. These ions were collided, prior to Fe(H 2 O) n mass selection, with Ar, or and apparent scattering cross-sections were measured. Simple collision models, N 2 , O 2 CH 3OH, coupled with a Monte Carlo simulation of the scattering experiment, were used to account quantitatively for the observations. The most striking result is that only methanol exchanges with a cluster water molecule, although this is a minor channel. There is inelastic scattering with argon but the other collisions are mainly elastic.

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Energetics of C+16 to C+36 photodissociation

Cited by 18 publications

References 26 publications

Ionization Thresholds of Small Carbon Clusters: Tunable VUV Experiments and Theory

Ionization Thresholds of Small Carbon Clusters: Tunable VUV Experiments and Theory

Ionization potentials, dissociation energies and statistical fragmentation of neutral and positively charged small carbon clusters

Collisions of Fe+ ions, clusters and hydroxides ligated by water molecules

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