Absolute total cross section for electron scattering on water in the energy range 25-300 eV

Saglam, Ziya; Aktekin, N

doi:10.1088/0953-4075/23/9/022

Cited by 27 publications

(9 citation statements)

References 7 publications

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“…However, due to the lack of a monochromator, the energy resolution was 0.35 eV, hence not allowing discrimination of even vibrational excitation. In fact, their results 40 are slightly (4% at 25 eV) lower than those of Szmytkowski; 35 the difference 41 amounts to 15% at 4 eV. Nishimura and Yano 42 used a similar linear geometry but a short (2.5 mm) scattering cell, which straightforwardly leads to large angular resolution errors: their TCS at 10 eV is 20% lower than that of Szmytkowski.…”

Section: Total Scattering Cross Sectionmentioning

confidence: 96%

Cross Sections for Electron Collisions with H2O

Song

Cho

Karwasz

et al. 2021

Journal of Physical and Chemical Reference Data

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Section: Total Scattering Cross Sectionmentioning

confidence: 96%

Cross Sections for Electron Collisions with H2O

Song

Cho

Karwasz

et al. 2021

Journal of Physical and Chemical Reference Data

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“…Unfortunately, it was not possible to locate a complete set of all cross-sections from a single source covering the entire energy range required. Measured values of cross-sections tend to depend upon experimental conditions (Saglam & Aktekin, 1990). Using varied sources will therefore lead to some uncertainty when considering the ratio of two cross-sections (e.g.…”

Section: Electron Scattering Cross-sectionsmentioning

confidence: 99%

An improved model for gaseous amplification in the environmental SEM

Thiel

Bache

Fletcher

et al. 1997

Journal of Microscopy

103

150

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SummaryWe present a new model for the gas amplification effect used in many environmental scanning electron microscopes, wherein molecular complexity is shown to be the critical factor. Monte Carlo simulations, based on experimental electron scattering cross-sections, are used to deduce a predictive model for the amplification process that is superior to the Townsend gas capacitor model. These predictions are compared with experimentally obtained amplification curves. Significantly, it is shown that the ionization efficiency of the electrons changes dramatically over the gap distance, and a constant value cannot be assumed. Atomic and molecular excitations affect the amplification process in two ways: first, they serve to lower the average kinetic energy of the imaging electrons, thereby keeping a greater fraction near the ionization threshold energy. Second, molecular normal modes determine the effectiveness of positive gas ions in producing additional secondaries upon surface impact. Practical implications such as signal gain and fraction of useful signal as a function of operating conditions are discussed in the light of the new model. Finally, we speculate on potential new contrast mechanisms brought about by the presence of an imaging gas.

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“…For example, the study of Ref. [20] found Solid symbols correspond to direct measurements, hollow symbols to measurements corrected for forward-angle elastic scattering: filled triangle present results, cyan filled circle [30], filled inverted triangle [15], open inverted triangle [13], filled square [16], darkred filled circle [31], times [32], filled rhombus [17]. (b) Total cross section comparison between present results filled triangle and theoretical predictions: dots SEP(CP)a1 [33], dotted dash SEP(ED) a1 [33]; integral elastic cross section dashed filled circle initial state J ¼ 0 [34], and dashed filled square thermal average [34]; dash additivity rule [35], dashed open circle semiempirical formula [35], dashed open square Schwinger approach [36], solid line R matrix [37], dashed plus IAM plus BEB [30].…”

mentioning

confidence: 99%

Angle-Resolved Electron Scattering from H2O near 0°

et al. 2019

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An electron beam, characterized by a high-angular discrimination (≃0.7°), has been used to measure the total (elastic plus inelastic) cross section of H 2 O in the energy range 3-100 eV. Broad coincidence is found with recent experiments, including a pronounced shoulder in the 6-12 eV region. However, at energies ≲6 eV, the present cross sections are ≃30% higher. Furthermore, forward scattering has been probed in the angular range 0°-3.5°and measures of the average (rotationally and vibrationally summed) differential elastic cross sections for incident energies ≤12 eV are obtained at a scattering angle ≃1 ∘ . The measurements, which provide the first test of theoretical predictions in an angular region experimentally unexplored until now, are found to be within 1 standard deviation of corresponding ab initio R-matrix calculations.

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Absolute total cross section for electron scattering on water in the energy range 25-300 eV

Abstract: Absolute total electron scattering cross sections for water molecules measured in the 25-300 eV incident energy range using a linear electron transmission device are presented. The results are compared with previous data.

Cited by 27 publications

References 7 publications

Cross Sections for Electron Collisions with H2O

Cross Sections for Electron Collisions with H2O

An improved model for gaseous amplification in the environmental SEM

Angle-Resolved Electron Scattering from H2O near 0°

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