A dynamical (e,2e) investigation of the structurally related cyclic ethers tetrahydrofuran, tetrahydropyran, and 1,4-dioxane

Abstract

Triple differential cross section measurements for the electron-impact ionization of the highest occupied molecular orbitals of tetrahydropyran and 1,4-dioxane are presented. For each molecule, experimental measurements were performed using the (e,2e) technique in asymmetric coplanar kinematics with an incident electron energy of 250 eV and an ejected electron energy of 20 eV. With the scattered electrons being detected at −5°, the angular distributions of the ejected electrons in the binary and recoil regions were observed. These measurements are compared with calculations performed within the molecular 3-body distorted wave model. Here, reasonable agreement was observed between the theoretical model and the experimental measurements. These measurements are compared with results from a recent study on tetrahydrofuran [D. B. Jones, J. D. Builth-Williams, S. M. Bellm, L. Chiari, C. G. Ning, H. Chaluvadi, B. Lohmann, O. Ingolfsson, D. Madison, and M. J. Brunger, Chem. Phys. Lett. 572, 32 (2013)] in order to evaluate the influence of structure on the dynamics of the ionization process across this series of cyclic ethers.

Triply differential (e,2e) studies of phenol

“…Note that the M3DW approach has been demonstrated to be quite successful in reproducing collision cross section data for the low and intermediateenergy electron impact ionisation of atoms and molecules. 19 The present work extends our previous results for molecules of some biological interest, such as pyrimidine, 20 tetrahydrofuryl alcohol (THFA), 21,22 tetrahydrofuran (THF), 22, 23 1,4-dioxane, 23,24 and tetrahydropyran (THP). 24 The structure of the present paper is as follows.…”

“…A detailed description of the employed method can be found elsewhere. [20][21][22][23][24] Briefly, however, a wellcollimated beam of electrons with energy E 0 = 250 eV collide with gaseous phenol at low pressure, with some electrons ionising the phenol target to yield two-outgoing electrons. The present high-purity sample of phenol was sourced from Ajax Unilab (assay > 99%), and is a solid at room temperature.…”

Study of Electron Ionization and Fragmentation of Non-hydrated and Hydrated Tetrahydrofuran Clusters

“…The ring is a constituent of deoxyribose in furanose form. Thus, a number of studies have been undertaken on electron collisions with THF, for example, the measurements of total cross-sections [20–24], differential elastic and inelastic scattering cross-sections [23–28], and electron ionization dynamics of THF [29–33]. …”

An (e, 2e + ion) study of low-energy electron-impact ionization and fragmentation of tetrahydrofuran with high mass and energy resolutions

“…The electron-impact ionization dynamics of THF has been studied at high collision energy using the so-called (e, 2e) technique. 24 The electronic structure of THF has been investigated by means of electron momentum spectroscopy. 25 Information on the molecular fragmentation is obtained using mass spectrometry to identify the residual ions for electron 12,26,27 and photon interactions.…”