Abstract
The results of measurements and calculations of absolute cross sections for elastic electron scattering from the 3-hydroxytetrahydrofuran (3hTHF) (C4H8O2) molecule are reported. The measurements were performed using a crossed beam experimental setup, for an incident electron energy range of 40–300 eV and an overall scattering angle range of 10°–110°. Relative differential cross sections (DCSs) were measured both as a function of the angle and the incident energy and the absolute DCSs were determined using the relative flow technique. The calculations of molecular cross sections are based on a corrected form of the independent-atom method, known as the screen corrected additivity rule (SCAR) procedure and using an improved quasifree absorption model. Additional calculations are also done to investigate the influence of rotational excitations and low-angular behavior of SCAR DCSs. The calculated dataset includes differential, integral and total cross sections in the energy range from 5 eV to 10 000 eV. The present results are discussed regarding the most recent low-energy elastic DCSs for 3hTHF (Vizcaino et al 2008 New J. Phys. 10 053002), as well as the recent DCSs for molecules of similar structure (tetrahydrofuran and tetrahydrofurfuryl alcohol).
Highlights
The results of measurements and calculations of absolute cross sections for elastic electron scattering from the 3-hydroxytetrahydrofuran (3hTHF) (C4H8O2) molecule are reported
Before discussing the absolute cross section values, it is interesting to investigate the relative behavior of the differential cross sections (DCSs) regarding both different molecules of similar structure which have been used to model deoxyribose and different theoretical approaches which have been applied in this energy range to calculate the cross sections
The experimental DCSs include the present results for 3hTHF molecule, as well as the previously published data for THF and tetrahydrofurfuryl alcohol (THFA)
Summary
The measurements were performed on a crossed electron–molecular target beam apparatus, which has been described in detail previously [12]. This method is based on measurements of intensities for elastic scattering by a reference gas and the gas under study, at a given incident electron energy (E) and scattering angle (θ ), under experimental conditions where these intensity ratios can be accurately established, so allowing determination of the absolute DCS of the gas under study according to the known elastic DCS for the reference gas It has been shown [21] that if the flows from the needle are identical for both gases (resulting in the same beam profile in the collision region), the absolute cross section for the gas under study (here 3hTHF) can be obtained according to the following formula: DCS3hTHF As the relative flow method imposes, the uncertainty of the absolute position of the final cross section surface still depends on the absolute error of the used reference DCSs
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