Metastable fragment production in electron–methanol collisions

Dech, J.; Kedzierski, W.; McConkey, J W

doi:10.1088/1361-6455/ab94c7

Cited by 2 publications

(2 citation statements)

References 40 publications

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“…Unfortunately, experimental data on the fragmentation dynamics of CH 3 OH by ND following electron impact, i.e., the kind of formed fragments, their formation thresholds, and formation cross sections, are very sparse. Dech et al reported a threshold of 13 eV for the production of O( 1 S) in crossed beam experiments . From thermodynamic considerations, the authors concluded that O( 1 S) is likely formed by decomposition of CH 3 OH into CH 3 • , H • , and O( 1 S).…”

Section: Discussion Of the Reaction Mechanismmentioning

confidence: 99%

Electron-Induced Processing of Methanol Ice

Schmidt

Swiderek

Bredehöft

2021

ACS Earth Space Chem.

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The formation of methane (CH4), formaldehyde (H2CO), ethylene glycol (HOCH2CH2OH), methoxymethanol (CH3OCH2OH), dimethyl ether (CH3OCH3), and ethanol (CH3CH2OH) upon electron irradiation of condensed multilayer adsorbates of CH3OH as a model of cosmic CH3OH ice has been monitored by the combined use of electron-stimulated and thermal desorption experiments. The energy-dependent relative yields of all products were measured between 2.5 and 20 eV, and the reaction mechanisms of product formation were deduced. The energy dependences of the yields of HOCH2CH2OH, CH3OCH2OH, CH3OCH3, and CH3CH2OH agree closely with their threshold at the lowest electronic excitation energy of CH3OH. The formation of these products is consequently ascribed to the reactions of radicals formed by the dissociation of neutral electronically excited states and, at higher energy, also by ionization and subsequent proton transfer to an adjacent CH3OH. These electron–molecule interactions also can contribute to the nonresonant formation of H2CO and CH4; these latter products are also produced through resonances around 4 eV reported previously from anion electron-stimulated desorption (ESD) experiments and around 13 eV seen earlier in the energy-dependent yield of carbon monoxide (CO). The present results constitute the most complete data set on the energy dependence of product formation during low-energy electron exposure of condensed CH3OH so far. They provide a comprehensive picture of the reactions triggered by electron impact with energies in the range between 2.5 and 20 eV as representative of low-energy secondary electrons that are released from condensed material, for instance, under the effect of cosmic radiation.

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Section: Discussion Of the Reaction Mechanismmentioning

confidence: 99%

Electron-Induced Processing of Methanol Ice

Schmidt

Swiderek

Bredehöft

2021

ACS Earth Space Chem.

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“…However, there are only a few reports in which this type of detector was used. For example, in one recent study, such detectors were used to investigate metastable fragments, i.e., O( 1 S) and CO(a 3 Π), formed through to the dissociative excitation of methanol in the electron energy range from their appearance energy to 100 eV [135].…”

Section: Neutral Detection By Other Techniquesmentioning

confidence: 99%

Electron scattering processes: fundamentals, challenges, advances, and opportunities

Ptasińska

Varella²,

Khakoo³

et al. 2022

Eur. Phys. J. D

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Much effort has been devoted to describing qualitatively and quantitatively electron scattering processes due to their ever-increasing importance in many industrial and medical applications. We present achievements made in the last years, focusing on some of the advancements and recent progress in the field. Particular reference is made on concrete case studies to probe the level of accord in cross-section data obtained from experiments and theory, as well as on selected instrumentation developments to probe dynamics of dissociative processes induced by electron impact. We stress that the purpose of this colloquium paper is not to be a comprehensive review but rather to provide a snapshot of different research topics in electron scattering by pointing out certain challenges and, therefore, indicating opportunities to facilitate further experimental and theoretical work.

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Metastable fragment production in electron–methanol collisions

Cited by 2 publications

References 40 publications

Electron-Induced Processing of Methanol Ice

Electron-Induced Processing of Methanol Ice

Electron scattering processes: fundamentals, challenges, advances, and opportunities

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