Mesoscale Energy Deposition Footprint Model for Kiloelectronvolt Cluster Bombardment of Solids

Russo, Michael F; Garrison, Barbara J.

doi:10.1021/ac061180j

Cited by 84 publications

(190 citation statements)

References 21 publications

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“…When doubly charged fullerenes were collided on a hydrocarbon surface at the same collision energy, however, as shown in Figure 5b, a significant amount of one electron charge reduction of C 60 2ϩ was observed without the extensive fragmentation seen on the fluorocarbon surface [21]. Because C 60 is used as a projectile for secondary ion mass spectrometry (SIMS) there is continued interest in C 60 collisions at a variety of surfaces and simulations of collisions at keV collision energies are still ongoing in the Garrison lab [23][24][25][26].…”

Section: Small Molecule Projectiles: Sid and Rissmentioning

confidence: 99%

Surface-induced dissociation of small molecules, peptides, and non-covalent protein complexes

Wysocki

Joyce

Jones

et al. 2008

J. Am. Soc. Mass Spectrom.

130

138

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This article provides a perspective on collisions of ions with surfaces, including surfaceinduced dissociation (SID) and reactive ion scattering spectrometry (RISS). The content is organized into sections on surface-induced dissociation of small ions, surface characterization of organic thin films by collision of well-characterized ions into surfaces, the use of SID to probe peptide fragmentation, and the dissociation of large non-covalent complexes by SID. Examples are given from the literature with a focus on experiments from the authors' laboratory. The article is not a comprehensive review but is designed to provide the reader with an overview of the types of results possible by collisions of ions into surfaces. (J Am Soc Mass Spectrom 2008, 19, 190 -208) © 2008 American Society for Mass Spectrometry T andem mass spectrometry (MS/MS) is an essential tool for elucidating ion structure. The MS/MS experiment involves mass selection of a precursor ion followed by ion activation and subsequent dissociation. The ion activation step is commonly accomplished via collision-induced dissociation (CID) in which the initial kinetic energy of a projectile ion is converted into internal energy through inelastic collisions with a neutral gas. Several alternative activation methods have been used in tandem mass spectrometry, one of which is surfaceinduced dissociation (SID). SID is analogous to CID, except that a surface replaces the neutral gas as the collision target. A typical ion-surface collision event is illustrated in Figure 1.The incorporation of a surface into a mass spectrometer for ion activation was pioneered in the laboratory of R. Graham Cooks in the mid-1970s and early 1980s [1][2][3]. Since that time, collisions of lowenergy (eV) organic ions with surfaces within the tandem mass spectrometer have been valuable for analyzing surface composition, characterizing reactions between organic projectile ions and surface adsorbates, chemically modifying surfaces, and determining projectile ion structure. A major motivation for development of SID is that energy transfer to ionic projectiles can be improved by increasing the mass of the collision target. The total available energy for transfer into the internal modes of the projectile ion is defined by the center-of-mass energy (E COM ) described by eq 1:where E LAB is the laboratory collision energy and M ION and M N are the masses of the projectile ion and neutral, respectively. Energy transfer in CID is limited by the mass of the collision partner, typically inert gases such as helium, argon, or xenon. In SID, if one assumes that the surface is an infinitely large collision partner, E COM becomes independent of mass and approaches the laboratory collision energy. The assumption that the entire surface can be viewed as the collision partner is not always valid, however, and there are instances where the mass of the terminal groups on the surface influence the amount of energy transfer [4,5]. Nonetheless, the use of a massive surface target should, in theory, provide ...

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Section: Small Molecule Projectiles: Sid and Rissmentioning

confidence: 99%

Surface-induced dissociation of small molecules, peptides, and non-covalent protein complexes

Wysocki

Joyce

Jones

et al. 2008

J. Am. Soc. Mass Spectrom.

130

138

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“…The depth profiling experiments utilizing C 60 in which interface widths between similar materials such as two metals 11,12 or two Langmuir-Blodgett films 14,15 give values of 8.7 and ∼23 nm, respectively. The molecular dynamics simulations in which the depth of origin of ejected material has been investigated, [21][22][23][24][25] however, consistently indicate that ejected material originates from the top 2-3 nm, values much smaller than experimental interface widths. There are two essential differences from the MD simulations given above and depth profiling experiments.…”

Section: Introductionmentioning

confidence: 99%

A Computational Investigation of C₆₀ Depth Profiling of Ag: Molecular Dynamics of Multiple Impact Events

2009

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ࠗ w This paper contains enhanced objects available on the Internet at http://pubs.acs.org/JPCC.Using 20-keV C 60 on a Ag sample, multiple cluster bombardment events have been performed with molecular dynamics simulations. The purpose of this investigation is to develop a protocol for making depth profiling simulations tractable, as well as to examine the topographical effects which arise due to multiple impacts on smooth surfaces. The results show that when the total yield is equivalent to the removal of one atomic layer (0.24 nm), the distribution of the ejected particles is spread throughout the top 5.5 nm of the sample. Examples of individual bombardment events on the damaged surface exhibit a diversity of dynamics that is not observed on flat surfaces. Using the computational methods outlined, we have been able to run depth profiling simulations on a large-scale system.

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“…1b). The process is mesoscopic in nature and can be described by a hydrodynamic ow model [3,4]. In this stage of sputtering material removal is dominated by azimuthally isotropic ejection of single atoms and small clusters from the crater.…”

Section: Resultsmentioning

confidence: 99%

“…While impact of atomic and small cluster projectiles like Au 3 can be described by a concept of a linear collision cascade or thermal spike, processes taking place during impacts of larger clusters are more mesoscopic in nature. Consequently, they are better described by concepts adopted from hydrodynamics [3,4].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Energetic Ar Cluster Bombardment of Ag(111)

et al. 2013

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Large-scale molecular dynamics computer simulations are used to investigate the dynamics of material ejection during high-energy Arn cluster bombardment of Ag(111) at normal incidence. The silver sample containing 7 million atoms is bombarded with Arn projectiles (n = 45−30000) with kinetic energy spanning from a few keV up to 1 MeV. Such a wide range of projectile parameters allows probing processes taking place during low-density collision cascade as well as during high-density events characteristic of micrometeorite bombardment in space. The material modications and total sputtering yield of ejected particles are investigated. While at low-energy impacts, ejection of individual silver atoms is the main emission channel, the ejection of large clusters from the corona of the created crater dominates for the high-energy impacts.

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Mesoscale Energy Deposition Footprint Model for Kiloelectronvolt Cluster Bombardment of Solids

Cited by 84 publications

References 21 publications

Surface-induced dissociation of small molecules, peptides, and non-covalent protein complexes

Surface-induced dissociation of small molecules, peptides, and non-covalent protein complexes

A Computational Investigation of C₆₀ Depth Profiling of Ag: Molecular Dynamics of Multiple Impact Events

Molecular Dynamics Simulations of Energetic Ar Cluster Bombardment of Ag(111)

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Mesoscale Energy Deposition Footprint Model for Kiloelectronvolt Cluster Bombardment of Solids

Cited by 84 publications

References 21 publications

Surface-induced dissociation of small molecules, peptides, and non-covalent protein complexes

Surface-induced dissociation of small molecules, peptides, and non-covalent protein complexes

A Computational Investigation of C60 Depth Profiling of Ag: Molecular Dynamics of Multiple Impact Events

Molecular Dynamics Simulations of Energetic Ar Cluster Bombardment of Ag(111)

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Product

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A Computational Investigation of C₆₀ Depth Profiling of Ag: Molecular Dynamics of Multiple Impact Events