Impact induced vibrational excitation in surface scattering of hyperthermal neutral C60 molecule

Tsipinyuk, B.; Budrevich, A.; Grinberg, Maurice; Kolodney, E.

doi:10.1063/1.473097

Cited by 38 publications

(14 citation statements)

References 34 publications

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“…More energy is imparted to the film as the projectile velocity increases, making the collision less elastic. This description of reflection is consistent with C 60 -graphite simulations involving the Brenner [20] and Takai-Lee-Halicioglu-Tiller potentials [9] as well as with experiment [15,17]. There are also similarities to the qualitative reflection mechanism in surface impact studies of C 60 and a diamond surface [21].…”

Section: Resultssupporting

confidence: 80%

Simulations of Xe@C₆₀ collisions with graphitic films

Albert

Sabin

Harris

2008

Int J of Quantum Chemistry

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ABSTRACT:Collisions between Xe@C 60 and sheets of graphite of various dimensions were simulated. A Tersoff many-body potential modeled the interactions between carbon atoms and a Lennard-Jones potential simulated the xenon-carbon interactions. The simulations were compared to experiment and with simulations which implemented other potentials. The results indicate that a relatively small graphite film can be an accurate approximation for a nearly infinite sheet of graphite.

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Section: Resultssupporting

confidence: 80%

Simulations of Xe@C₆₀ collisions with graphitic films

Albert

Sabin

Harris

2008

Int J of Quantum Chemistry

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“…Finally, with the help of Eq. (13) and using the canonical expression from Tsipinyuk et al [29], an explicit approximate relation between the internal energy and the microcanonical temperature is obtained:…”

Section: ͑23͒mentioning

confidence: 99%

Time-dependent spectrum of thermionic emission from hot clusters: Model and example ofC60

Lépine

Bordas

2004

Phys. Rev. A

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We have studied the evolution of the kinetic energy distribution of thermal electrons emitted from energyrich clusters as a function of the delay after multiphoton excitation. In this paper we emphasize the description of thermionic emission based on the general formalism of the detailed balance theory. Our description accounts for competing decay channels and underlines the fundamental role of the observation time window. Simulations including two decay channels (namely, delayed electron emission and loss of C 2 fragments) are compared with experimental results in the case of hot fullerenes C 60 . The most striking result of the model is the close connection between the effective temperature of the electron distribution and the time delay of observation. Our model is in very good agreement with our experimental measurements of time-dependent photoelectron spectra.

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“…1, this expression leads to Ē v − ZPE ϵ E v eff Ϸ 79, 103, and 134 eV for E 0 = 300, 600, and 900 eV correspondingly ͑here ZEP is the C 60 zero point energy and equals 9.7 eV͒. 20 These values of E v eff exceed ͑or are nearly the same as͒ the normal components of the kinetic energy loss of the precursor species calculated as ⌬E Ќ ͑E 0 ͒ = ͓E 0 cos 2 i − n͑E 0 ͒cos 2 r ͔: 52, 103, and 152 eV correspondingly ͑ i = 63°, r = 72°͒. Taking into account also an appreciable part ␤ of ⌬E Ќ which is lost to surface excitation, one gets E v eff ӷ ͑1−␤͒⌬E Ќ ͑E 0 ͒, thus leading to the conclusion that a substantial part of E v eff is contributed by the parallel component of the kinetic energy loss ⌬E ʈ .…”

Section: Maxwellianmentioning

confidence: 98%

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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Impact induced vibrational excitation in surface scattering of hyperthermal neutral C60 molecule

Cited by 38 publications

References 34 publications

Simulations of Xe@C₆₀ collisions with graphitic films

Simulations of Xe@C₆₀ collisions with graphitic films

Time-dependent spectrum of thermionic emission from hot clusters: Model and example ofC60

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

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Impact induced vibrational excitation in surface scattering of hyperthermal neutral C60 molecule

Cited by 38 publications

References 34 publications

Simulations of Xe@C60 collisions with graphitic films

Simulations of Xe@C60 collisions with graphitic films

Time-dependent spectrum of thermionic emission from hot clusters: Model and example ofC60

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

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Product

Resources

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Simulations of Xe@C₆₀ collisions with graphitic films

Simulations of Xe@C₆₀ collisions with graphitic films