Effects of projectile track charging on the H− secondary ion velocity distribution

Iza, Peter; Farenzena, L. S.; Silveira, E.F. da

doi:10.1016/j.nimb.2006.12.070

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…On the other hand, peripheral regions with respect to the impact site might be negatively charged by the low-energy secondary electrons [predominately of low energy (electronvolts), but can reach values on the order of kiloelectronvolts] from deep segments of the track and be more efficient platforms for H − emission. According to this point of view, H + and H − ions both have relatively large desorption yields but originate from different surface regions or might be emitted at distinct times, revealing different circumstances of solid relaxation …”

Section: Resultsmentioning

confidence: 99%

“…The most common positive ions desorbed by this technique are H 3 O + , H 2 O + , H + , HCO + , and (HCOOH)H + , and the more intense negative ions are HOCO − (or HCOO − ), H − , O − , and OH − . The positive ions generally have higher kinetic energies than the negative molecular ions. , This difference between cation and anion kinetic energies is due to the positive infratrack (shown in Figure b), which repels the positive ions and tends to keep back the negative ions until their neutralization.…”

Section: Resultsmentioning

confidence: 99%

“…According to this point of view, H + and Hions both have relatively large desorption yields but originate from different surface regions or might be emitted at distinct times, revealing different circumstances of solid relaxation. 29 Figure 3 shows the (a) positive and (b) negative mass spectra of icy formic acid in the mass/charge (m/z) range up to 50 u/e obtained by impact of energetic ions (z is typically equal to (1e). The fragment yields per ion impact are reported in Table 1, where positive and negative yields are indicated by PY and NY, respectively.…”

Section: Plasma Desorption Mass Spectrometry (Pdms)mentioning

confidence: 99%

“…The positive ions generally have higher kinetic energies than the negative molecular ions. 29,30 This difference between cation and anion kinetic energies is due to the positive infratrack (shown in Figure 2b), which repels the positive ions and tends to keep back the negative ions until their neutralization. The ratios between the positive and negative full widths at half-maximum (fwhm), PFWHM and NFWHM, respectively, are presented in Table 2.…”

Section: Plasma Desorption Mass Spectrometry (Pdms)mentioning

confidence: 99%

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Astrophysical Icy Surface Simulation under Energetic Particles and Radiation Field in Formic Acid

et al. 2008

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In this work, the fragmentation, survival, and chemical reactions of formic acid (HCOOH) molecules condensed at 56 K are analyzed using plasma desorption mass spectrometry (PDMS) and photon-stimulated ion desorption (PSID) in an effort to simulate the effects of energetic charged particles (e.g., cosmic rays) and radiation fields on interstellar/cometary ices. The measurements were taken at the Brazilian Synchrotron Light Laboratory (LNLS), employing soft X-ray photons (535.1 eV) and energetic ions (∼65 MeV) obtained as 252 Cf fission fragments. Mass spectra of positive and negative desorbed ions were obtained using a time-of-flight (TOF) spectrometer, providing information on the fragmentation pattern and abundance of the ionic species released from the icy surface. In both techniques, the major contribution to the released/desorbed ions were positively charged fragments. The production of several series of clusters, some of them with mass/charge ratios of up to 500 u/e, was observed in the PDMS spectra. Comparison between the employed techniques (photon and ion impacts) indicates that the interaction of energetic ions with formic acid ice produces a greater variety of ions than soft X-ray photon impact. This suggests that cosmic rays and high-energy solar wind particles, despite its reduced flux compared to other lower-energy particles, might play an important role in the synthesis of prebiotic molecules.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Plasma Desorption Mass Spectrometry (Pdms)mentioning

confidence: 99%

Section: Plasma Desorption Mass Spectrometry (Pdms)mentioning

confidence: 99%

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Astrophysical Icy Surface Simulation under Energetic Particles and Radiation Field in Formic Acid

et al. 2008

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“…In addition to mass distributions, differential yields such as angular distributions or energy spectra can be determined (Allodi et al 2013). Differential (energy, angle) XY-TOF-SIMS studies have been conducted only in some select cases such as distributions of H + and Hsputtered from water ices (Iza et al 2007).…”

Section: Detection Techniquesmentioning

confidence: 99%

Modification of ices by cosmic rays and solar wind

Rothard

Domaracka

Boduch

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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Astrophysical ices are exposed to different radiation fields including photons, electrons and ions. The latter stem from interstellar cosmic rays (CR), the solar and stellar winds, shock waves or are trapped in the magnetospheres of giant planets. We briefly discuss the physics of energy deposition by ion ir radiation in condensed matter and experimental methods to study the induced effects. We then present results on radiation effects such as sputtering, amorphisation and compaction, dissociation of molecules, formation of new molecular species after radiolysis and by implantation of ions. The formation and radio-resistance of organic molecules, related to the question of the initial conditions for the emergence of life, are briefly discussed. This review is not meant to be comprehensive, but rather focusses on recent findings, with special emphasis on experiments with heavy multiply charged ion beams. These experiments aim in particular at simulating the effects of CRs on icy grains in dense molecular clouds, and on the formation of molecules on icy bodies in the Solar System.

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Complementary and Emerging Techniques for Astrophysical Ices Processed in the Laboratory

et al. 2013

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Effects of projectile track charging on the H− secondary ion velocity distribution

Cited by 6 publications

References 26 publications

Astrophysical Icy Surface Simulation under Energetic Particles and Radiation Field in Formic Acid

Astrophysical Icy Surface Simulation under Energetic Particles and Radiation Field in Formic Acid

Modification of ices by cosmic rays and solar wind

Complementary and Emerging Techniques for Astrophysical Ices Processed in the Laboratory

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