Emission of ionic water clusters from water ice films bombarded by energetic projectiles

Wojciechowski, I.A.; Кутлиев, У.О.; Sun, Shilong; Szakal, Christopher; Winograd, Nicholas; Garrison, Barbara J.

doi:10.1016/j.apsusc.2004.03.036

Cited by 18 publications

(19 citation statements)

References 12 publications

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“…Thus, the creation of new ions and attachment of the new ions to the molecule is possible. Moreover, the same simulations (Ryan et al, 2007) as well as the study of pre‐formed ions by Wojciechowski et al (2004a,b) show that recombination of near‐by ions to form neutral species is very probable. In addition to the formation of parent (M + H) + ions the model should, therefore, predict all the water cluster distributions mentioned above.…”

Section: Ionizationmentioning

confidence: 72%

“…They find that free matrix ions are formed in both the desorption and ablation regime although as discussed above, they find that the analyte ions remain embedded in clusters composed of matrix molecules throughout the simulation time (several nanosecond). In the second study, Wojciechowski and co‐workers examined the emission of pre‐formed salt ions from a water matrix in SIMS in a joint computation and experimental study (Wojciechowski et al, 2004a,b) They found experimentally that for over four orders of magnitude of salt concentration the ion intensities are relatively constant and more cations are emitted than anions. Moreover, for 1 M solutions the bare ion (e.g., Na + or I − ) is the predominant species over hydrated ions.…”

Section: Ionizationmentioning

confidence: 99%

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Computational view of surface based organic mass spectrometry

Garrison

Postawa

2008

Mass Spectrometry Reviews

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147

204

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Surface based mass spectrometric approaches fill an important niche in the mass analysis portfolio of tools. The particular niche depends on both the underlying physics and chemistry of molecule ejection as well as experimental characteristics. In this article, we use molecular dynamics computer simulations to elucidate the fundamental processes giving rise to ejection of organic molecules in atomic and cluster secondary ion mass spectrometry (SIMS), massive cluster impact (MCI) mass spectrometry, and matrix‐assisted laser desorption ionization (MALDI) mass spectrometry. This review is aimed at graduate students and experimental researchers. © 2008 Wiley Periodicals, Inc., Mass Spec Rev 27: 289–315, 2008

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Section: Ionizationmentioning

confidence: 72%

Section: Ionizationmentioning

confidence: 99%

Computational view of surface based organic mass spectrometry

Garrison

Postawa

2008

Mass Spectrometry Reviews

Self Cite

147

204

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“…Since size effects often appear for properties such as energy gap when the size of cluster structures reaches nanometers, we focus our study on the effect of size on oxidation and thus on stability. In this work [2], models of hydrogenated surfaces Si (001) and Si (111) -Si9H14 -SiH2 and Si10H15 -SiH3 were obtained, as well as smaller Si2H6 -SiH2 and Si5H10 -SiH2, SiH3 -SiH3 and Si4H9 -SiH3. These reactions were studied to develop a dimensional dependence of reactivity with water and the stability of local structures.…”

Section: Oclc -1121105553mentioning

confidence: 70%

“…It is known that some of the sputtered particles correspond to cluster ions. Clusters are formed in vibrationally excited states and decay on their way from the target to the detector [2]. The discovery of fragmentation of sputtered clusters (Standing's work) has significantly complicated the understanding of the cluster emission mechanism, since their decay affects the measured mass spectra, kinetic energy spectra, and the distribution of internal energies of clusters.…”

Section: Introductionmentioning

confidence: 99%

Methods For Generation Of Cluster Particles Of Different Stochiometry

Sh.T.

Kosimov

Murodkobilov

et al. 2020

tajas

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The main purpose from this paper, in semiconductor technology silicon oxide is to study notable of the surface and catalysis process. As a result, cluster fragmentation processes, we obtained information about the emission of the clusters and the chemical and physical properties of the clusters. We found during the study that oxide clusters are heterogeneous clusters. In heterogeneous clusters, the bonds in the main chain are different from the bonds in the side chain, as in organic polymers. We tried to prove on the basis of the analysis of experimental data that the formation, excitation and molecular decomposition of SinO2n + 1Hk- (k = 1-3) cluster ions are based on the model of the combinatorial synthesis mechanism.

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“…Incorporated water plays an important role in determining the yield of negatively charged monatomic species. Water ice drastically reduced the SI yields of negative ions compared to positive monatomic ions in computational studies [ 59 , 60 ], and this may explain why the SI intensities were lower in the FH cells. The insignificant decrease in the OH - intensity was not surprising as it is a water fragment.…”

Section: Resultsmentioning

confidence: 99%

Characterization of sample preparation methods of NIH/3T3 fibroblasts for ToF-SIMS analysis

Robinson

Castner

2013

Biointerphases

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The information that is obtained from single cells during ToF-SIMS analysis is influenced by the method that was used to prepare the cells. The removal of extracellular media before analysis is necessary, but the rinsing technique should not damage the plasma membrane of the cell. The presence of intracellular salts reduced the secondary ion yield an average of 2.6-fold during Bi3+/C60++ depth profiles. Chemical fixation followed by rinsing removed a majority of the intracellular salts, “recovering” the positive secondary ion yields. The formaldehyde-fixation process removed a majority of the intracellular Cl−, but other key anions were not removed in significant amounts. The data presented here is consistent the anion neutralization mechanism largely responsible for the lower ion yields. All of the organic secondary ions that were detected in the freeze-dried cells were also detected in the formaldehyde-fixed cells, suggesting that the fixation process did not remove any molecular species to an extent that is detectable by ToF-SIMS. Compared to freeze dried cells, well preserved, frozen-hydrated cells showed little increase, or a decreased yield, for most low mass ions, but an increased yield for larger mass fragments. This is consistent with a reduced damage cross section at cryogenic analysis temperatures, although proton donation from water and reduction the salt effects in the presence of water likely also play roles. Numerous ions detected from the frozen-hydrated cells were not detected from the freeze dried cells, however many of these ions were attributed to chemical combinations of water, salts and the ammonium acetate rinsing solution.

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Emission of ionic water clusters from water ice films bombarded by energetic projectiles

Cited by 18 publications

References 12 publications

Computational view of surface based organic mass spectrometry

Computational view of surface based organic mass spectrometry

Methods For Generation Of Cluster Particles Of Different Stochiometry

Characterization of sample preparation methods of NIH/3T3 fibroblasts for ToF-SIMS analysis

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