Helium Atom Scattering from Cyclopentane, Pyrrolidine and Tetrahydrofurane in Crossed Molecular Beams

Abstract

Scattering of helium atoms by cyclopentane, pyrrolidine and tetrahydrofurane molecules was ob-served in crossed molecular beam experiments. The intensity of scattered helium atoms, depending on the scattering angle, was measured with high resolution, and the damping of the diffraction oscillations of the differential cross sections was used to extract elastic anisotropic interaction potentials for these molecules. The evaluation included a geometric transformation concerning the puckered states of the envelope and the twisted conformation of the molecules. The potentials were found to be rather similar.

Positron and electron scattering from tetrahydrofuran

“…As low-energy secondary electrons are produced in large quantities by ionizing radiation, most scattering experiments have hitherto concentrated on resonant electron measurements from solid and gas phase DNA constituents [6][7][8]11], although for completeness we also note the helium atom scattering work from Gebauer et al [12]. Further note that none of the earlier electron scattering measurements appear to have reported absolute cross sections.…”

Helium Atom Scattering from C2H6, F2HCCH3, F3CCH2F and C2F6 in Crossed Molecular Beams

“…As has been reported previously [1][2][3][4][5] reliable potentials for the interaction between He atoms and even rather anisotropic molecules can be determined from rotationally unresolved total differential cross sections (DCS), observed in respective scattering experiments using crossed molecular beams. Results of an infinite order sudden approximation (IOSA) [6 -9] were fitted to the observed DCS using a modified Hartree Fock dispersion potential (HFD) [10] to model the scattering interaction.…”