Low-energy elastic electron scattering from furan

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.062716· OSTI ID:21437906

Khakoo, M A; Muse, J; Ralphs, K ^[1]; Costa, R F ^[2]; Bettega, M H. F. ^[3]; Lima, M A. P. ^[4]

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1. Department of Physics, California State University, Fullerton, California 92834 (United States)
2. Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, 09210-170 Santo Andre, Sao Paulo (Brazil)
3. Departamento de Fisica, Universidade Federal do Parana, Caixa Postal 19044, 81531-990 Curitiba, Parana (Brazil)
4. Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Caixa Postal 6165, 13083-970 Campinas, Sao Paulo (Brazil)

We report normalized experimental and theoretical differential cross sections for elastic electron scattering by C{sub 4}H{sub 4}O (furan) molecules from a collaborative project between several Brazilian theoretical groups and an experimental group at California State Fullerton, USA. The measurements are obtained by using the relative flow method with helium as the standard gas and a thin aperture target gas collimating source. The relative flow method is applied without the restriction imposed by the relative flow pressure condition on helium and the unknown gas. The experimental data were taken at incident electron energies of 1, 1.5, 1.73, 2, 2.7, 3, 5, 7, 10, 20, 30, and 50 eV and covered the angular range between 10 deg. and 130 deg. The measurements verify observed {pi}* shape resonances at 1.65{+-}0.05eV and 3.10{+-}0.05 eV scattering energies, in good agreement with the transmission electron data of Modelli and Burrow [J. Phys. Chem. A 108, 5721 (2004)]. Furthermore, the present results also indicated both resonances dominantly in the d-wave channel. The differential cross sections are integrated in the standard way to obtain integral elastic cross sections and momentum transfer cross sections. The calculations employed the Schwinger multichannel method with pseudopotentials and were performed in the static-exchange and in the static-exchange plus polarization approximations. The calculated integral and momentum transfer cross sections clearly revealed the presence of two shape resonances located at 1.95 and 3.56 eV and ascribed to the B{sub 1} and A{sub 2} symmetries of the C{sub 2v} point group, respectively, in very good agreement with the experimental findings. Overall agreement between theory and experiment regarding the differential, momentum transfer, and integral cross sections is very good, especially for energies below 10 eV.

• OSTI ID: 21437906
• Journal Information: Physical Review. A, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevA.81.062716; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APPROXIMATIONS
D WAVES
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
EV RANGE
FURANS
HELIUM
INTEGRAL CROSS SECTIONS
MOLECULES
MOMENTUM TRANSFER
POLARIZATION
POTENTIALS
RESONANCE
CALCULATION METHODS
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
FLUIDS
GASES
HETEROCYCLIC COMPOUNDS
LEPTONS
MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PARTIAL WAVES
RARE GASES
SCATTERING