Energy redistribution in cluster–surface collision: I2− (CO2)<i>n</i> onto silicon surface

Yasumatsu, Hisato; Koizumi, Shinichi; Terasaki, Akira; Kondow, Tamotsu

doi:10.1063/1.472784

Cited by 50 publications

(38 citation statements)

References 26 publications

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“…The collision energy is given by the difference between the mean kinetic energy of the impinging ions and the target voltage. Ion intensities have been normalized to the intensity of incoming parent cluster ions and have been scaled to account for the velocity-dependent ion detection efficiency [42].…”

Section: Data Evaluationmentioning

confidence: 99%

Collision-induced fragmentation and neutralization of methanol cluster cations

Christen

Even

2001

The European Physical Journal D

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This contribution addresses the inelastic interaction of positively charged molecular cluster ions with a solid surface at kinetic energies up to 30 eV/molecule. We report experimental results on the scattering of mass-selected, protonated methanol cluster cations (CH3OH)nH + , n = 4−32, off a diamondcoated silicon surface. In particular we provide fragment size distributions of methanol cluster ions following their impact on the target, as well as surface-induced neutralization probabilities of methanol cluster ions as a function of the size and the kinetic energy of the parent clusters.

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Section: Data Evaluationmentioning

confidence: 99%

Collision-induced fragmentation and neutralization of methanol cluster cations

Christen

Even

2001

The European Physical Journal D

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“…In particular, I 2 Ϫ has been studied in a wide variety of environments, including gas phase clusters, [3][4][5][6][7][8][9][10][11][12] liquid solutions, [13][14][15][16][17][18][19][20][21] and gas-surface collisions, [22][23][24][25] and these experiments have stimulated a variety of theoretical studies. These solvated molecular ions differ considerably from their neutral counterparts, since the interaction between the ion and the surrounding solvent, which can be as strong as the chemical bonding forces within the solute, depends sensitively on the solute charge distribution.…”

Section: Introductionmentioning

confidence: 99%

Simulation of UV photodissociation of I2−(CO2)n: Spin-orbit quenching via solvent mediated electron transfer

Delaney

Faeder

Parson

1999

The Journal of Chemical Physics

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We simulate the 395 nm photodissociation of I2− embedded in clusters of 6 to 22 CO2 molecules. In the isolated molecule, photodissociation at this wavelength leads exclusively to spin-orbit excited iodine (I*) plus I−. In the larger clusters we observe efficient electronic relaxation, leading both to dissociated products containing ground-state iodine and to recombined products containing I2−. The time scale and cluster size dependence of the spin-orbit quenching process agree well with experimental determinations of Sanov et al. (companion paper). The simulation trajectories show that spin-orbit quenching occurs by resonant charge transfer from solvated I− to a nascent I* atom. A model derived from the theory of electron transfer reactions in solution illustrates that this resonance arises when the I spin-orbit energy is compensated by the difference between the solvation energies of the ion and the neutral.

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“…2,3 Of special interest in this context are multiparticle breakup ͑multifragmen-tation͒ phenomena which were studied already for several molecular species but mainly in the complete impact disintegration limit ͑shattering͒, where the projectile is shattered into its smallest constituents. The so-called shattering transition 4-6 from the region of delayed evaporationlike emission of elementary subunits to complete disintegration was observed so far in weakly bound clusters such as ͑NH 3 ͒ n H + ͑n =4-40͒, 6 I 2 ͑CO 2 ͒ n − ͑n =1-50͒, 7 antimony clusters Sb n + ͑n =3-12͒, 8 and also covalent molecular ions such as Si͑Cd 3 + ͒, 9 peptide ions, 10 and fullerenes. [11][12][13] Fullerene molecules and C 60 specifically have recently turned into a model system for studying different types of fragmentation phenomena following extreme collisional and optical excitations.…”

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confidence: 94%

Transition from during- to post-collision multifragmentation in cluster surface impact

et al. 2009

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Multifragmentation of C 60 − was studied by measuring the kinetic energies of outgoing C n − ͑n =2-12͒ fragments following C 60 − collisions with a gold surface at sub-keV impact energies. We observe the transition from a multifragmentation with common average energy for all fragments ͑"during-collision" event͒ to a one with a common average velocity for all fragments ͑"post-collision" event͒. The energy distributions for both multifragmentation modes were successfully modeled by treating the fragmenting cluster as a hot "gas" consisted of various C n fragments and moving with some center of mass velocity.Fragmentation modes of highly energized microscopic systems, ranging from large macromolecular ions to hot atomic nuclei, are of fundamental physical interest. Their importance is quite often related with the universal patterns revealed and shared by the measured distributions ͑mass, energy, etc.͒. 1 These patterns may be applicable for interpreting and predicting fragmentation processes of different objects over very large scales of size and energy. 2,3 Of special interest in this context are multiparticle breakup ͑multifragmen-tation͒ phenomena which were studied already for several molecular species but mainly in the complete impact disintegration limit ͑shattering͒, where the projectile is shattered into its smallest constituents. The so-called shattering transition 4-6 from the region of delayed evaporationlike emission of elementary subunits to complete disintegration was observed so far in weakly bound clusters such as ͑NH 3 ͒ n H + ͑n =4-40͒, 6 I 2 ͑CO 2 ͒ n − ͑n =1-50͒, 7 antimony clusters Sb n + ͑n =3-12͒, 8 and also covalent molecular ions such as Si͑Cd 3 + ͒, 9 peptide ions, 10 and fullerenes. 11-13 Fullerene molecules and C 60 specifically have recently turned into a model system for studying different types of fragmentation phenomena following extreme collisional and optical excitations. 14-16 Shattering-type fragmentation was reported by Beck et al. 11 for C 60 + ions impacting a graphite surface over the 200-1800 eV energy range based on the evolution of mass distributions alone. The common assumption in the literature is that surface-impact-induced multifragmentation event is completed when the fragments are still in close contact with the surface. This should result in uncorrelated velocities of the outgoing fragments. However, since the reported experimental characterization of these fragments is very limited, not much is known about the actual dynamics of the multifragmentation event. Recently we have shown that the sub-keV multifragmentation of C 60 − impacting a gold surface at near-grazing incidence is a fully correlated event, where all scattered C n − fragments have nearly the same velocity. 12,13 Here we show that by changing the scattering angle ⌿ by 90°, from near grazing ͑⌿ = 45°͒ to near normal ͑⌿ = 135°͒, we observe a dramatic transition from a common-velocity multifragmentation event to a commonenergy one ͑with corresponding kinetic energy losses of 60% and over 99%͒. Our measurem...

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Energy redistribution in cluster–surface collision: I2− (CO2)n onto silicon surface

Abstract: Studies of silicon cluster-metal atom compound formation in a supersonic molecular beamThe chemistry of sizedselected silicon clusters as studied by fourier transform mass spectrometry AIP Conf.

Cited by 50 publications

References 26 publications

Collision-induced fragmentation and neutralization of methanol cluster cations

Collision-induced fragmentation and neutralization of methanol cluster cations

Simulation of UV photodissociation of I2−(CO2)n: Spin-orbit quenching via solvent mediated electron transfer

Transition from during- to post-collision multifragmentation in cluster surface impact

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