Ion-track model for fast-ion-induced desorption of molecules

Hedin, A.; H»kansson, P.; Sundqvist, B.; Re, Johnson

doi:10.1103/physrevb.31.1780

Cited by 137 publications

(30 citation statements)

References 34 publications

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“…The radius r 2 can be associated to the heavy damage zone, the core region, and the other r 1 to a distance that lie between the core radius and the maximum range of the d-rays emitted perpendicular to the ion trajectory. The ion energy dissipation is mediated by energetic electrons and the dose distribution around the ion track has been the subject of several studies [14][15][16][17]. In general they proposed a model in which the dose D(r), at a distance not so close to the ion trajectory, is proportional to the stopping power dE=dx and decreases approximately with r À2 ; DðrÞ / ðdE=dxÞ=r 2 .…”

Section: Discussionmentioning

confidence: 99%

Stopping power dependence of maximum grafting yield and absorbance measurements

Bermúdez

Chappa

Grosso

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Discussionmentioning

confidence: 99%

Stopping power dependence of maximum grafting yield and absorbance measurements

Bermúdez

Chappa

Grosso

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

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“…Any mechanism for the explosive assistance phenomenon should be consistent with the generally accepted ion track model 12 of fast ion bombardment. Before discussing such a consistency, the sequence of events in fast ion bombardment, as worked out by Muzumder in 1969, 14 will be briefly summarized.…”

Section: Theory the Ion Track Modelmentioning

confidence: 98%

“…24 Such a situation is possible locally above an ultra-track region due to desorption of radical analyte ions (proton acceptors) and a conversion of the explosive material into gaseous products (possible proton donors). A straightforward application of this model provides a Poisson distribution of molecular charge states, similar to the multiple-hit model assuming ionization/desorption as a direct result of -electron action, 12 and the electronic damage model predicting damage cross sections. 25 Figure 8, where charge state distributions for two insulin thicknesses, 30 and 750 Å , are compared to theoretical Poisson distributions of the form:…”

Section: Mechanisms For the Explosive's Assistancementioning

confidence: 99%

“…7 In explosive materials, the energy release happens at the last stages of conversion to the final products (such as N 2 , CO and H 2 O). 18 For consistency with the ion track model, 12 this conversion must occur after a very short primary activation of 10 À15 -10 À13 s, and the final product formation time must be within 10 À9 s, the order of time for molecular ion formation in PDMS. 17 The important question that will be considered here is whether this can happen, taking into account rapid (faster than 1 ns) desorption into the gas phase.…”

Section: Explosive Matrix Assistance Mechanisms Related To the Ion Trmentioning

confidence: 99%

“…5 The new results for HMX are compared to the NC results and related to predictions from several mechanisms for the explosive's assistance. Correlations of the new experimental data and the different mechanisms to the ion track model 12 of fast ion bombardment of insulators are also made.…”

mentioning

confidence: 98%

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Interaction between explosive and analyte layers in explosive matrix-assisted plasma desorption mass spectrometry

Håkansson

Zubarev

Coorey

et al. 1999

Rapid Commun. Mass Spectrom.

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An HMX/insulin two-layer system was chosen as a model for further investigation of the matrix properties of explosive materials for protein analytes in plasma desorption mass spectrometry. The dependencies of the molecular ion yield and average charge state as a function of the analyte thickness were studied. An increase in the charge state of multiply protonated molecular species was confirmed as the major matrix effect, with the average charge state z at the smallest thickness studied being higher than in matrix-assisted laser desorption/ionization and closer to the value obtained in electrospray ionization under standard acidic conditions. Observed charge state distributions are significantly narrower than the corresponding Poisson distributions, which suggests that the protonation of insulin is limited in plasma desorption by the number of basic sites in the molecule, similar to electrospray ionization. Both the curve displaying total molecular ion yield and the one showing the total charge (proton) yield as a function of the insulin thickness have maxima at a thickness different from an insulin monolayer. These observations diminish the significance of a matrix/analyte interface mechanism for the explosive matrix assistance. Instead, a mechanism related to the chemical energy release during conversion of the explosive after the ion impact is proposed. As additional mechanisms, enhanced protonation of the analyte through collisions with products of the explosive decay is considered, as well as electron scavenging by other products, which leads to a higher survival probability of positively charged protein molecular ions. Copyright 1999 John Wiley & Sons, Ltd.

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Interaction between explosive and analyte layers in explosive matrix‐assisted plasma desorption mass spectrometry

Håkansson

Zubarev

Coorey

et al. 1999

Rapid Commun. Mass Spectrom.

View full text Add to dashboard Cite

An HMX/insulin two-layer system was chosen as a model for further investigation of the matrix properties of explosive materials for protein analytes in plasma desorption mass spectrometry. The dependencies of the molecular ion yield and average charge state as a function of the analyte thickness were studied. An increase in the charge state of multiply protonated molecular species was confirmed as the major matrix effect, with the average charge state z at the smallest thickness studied being higher than in matrix-assisted laser desorption/ionization and closer to the value obtained in electrospray ionization under standard acidic conditions. Observed charge state distributions are significantly narrower than the corresponding Poisson distributions, which suggests that the protonation of insulin is limited in plasma desorption by the number of basic sites in the molecule, similar to electrospray ionization. Both the curve displaying total molecular ion yield and the one showing the total charge (proton) yield as a function of the insulin thickness have maxima at a thickness different from an insulin monolayer. These observations diminish the significance of a matrix/ analyte interface mechanism for the explosive matrix assistance. Instead, a mechanism related to the chemical energy release during conversion of the explosive after the ion impact is proposed. As additional mechanisms, enhanced protonation of the analyte through collisions with products of the explosive decay is considered, as well as electron scavenging by other products, which leads to a higher survival probability of positively charged protein molecular ions.

show abstract

Ion-track model for fast-ion-induced desorption of molecules

Cited by 137 publications

References 34 publications

Stopping power dependence of maximum grafting yield and absorbance measurements

Stopping power dependence of maximum grafting yield and absorbance measurements

Interaction between explosive and analyte layers in explosive matrix-assisted plasma desorption mass spectrometry

Interaction between explosive and analyte layers in explosive matrix‐assisted plasma desorption mass spectrometry

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