Absorption effects in intermediate-energy electron scattering by hydrogen sulphide

Brescansin, L. M.; Machado, L. E.; Lee, M.-T.; Cho, H.; Park, Y. S.

doi:10.1088/0953-4075/41/18/185201

Cited by 22 publications

(36 citation statements)

References 44 publications

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“…This effect was, in fact, observed in recent investigations on elastic electron-molecule collisions where inclusion of a complex optical potential representing the inelastic channels improved the agreement between calculated and measured DCS at intermediate angles (see, for instance, Refs. [38,39] and references therein).…”

Section: Resultsmentioning

confidence: 99%

Low-energy elastic electron scattering from furan

et al. 2010

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We report normalized experimental and theoretical differential cross sections for elastic electron scattering by C 4 H 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 • and 130 • . The measurements verify observed π * 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 1 and A 2 symmetries of the C 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.

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Section: Resultsmentioning

confidence: 99%

Low-energy elastic electron scattering from furan

et al. 2010

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“…In our calculation, the dynamics of the projectiletarget interaction is represented by a molecular complex optical potential (MCOP) at the static-exchange-polarization plus absorption (SEPA) level of approximation. This model has already been applied by our group to study electron collisions with other sulfur-containing molecules, e.g., H2S [10] and SO2 [11], and has successfully reproduced similar double-dip structures. For the sake of completeness, our calculations were carried out in the wide 1-500 eV energy range, thus providing cross-section data at energies below 30 eV, not covered in the Rao et al 's article.…”

Section: Introductionmentioning

confidence: 87%

“…In order to overcome this difficulty, a Born-closure formula was used to account for the contribution of higher partial-wave components to the scattering amplitudes. The procedure used was the same as that in some of our previous studies [10,18,37].…”

Section: Theory and Numerical Proceduresmentioning

confidence: 99%

Theoretical and experimental investigation of electron collisions with dimethyl sulfide

et al. 2015

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We report a joint theoretical-experimental investigation of elastic electron scattering by dimethyl sulfide in the low-and intermediate-energy regions. More specifically, experimental differential, integral, and momentumtransfer cross sections are given in the 30-800 eV and 10°-130° ranges. Theoretical cross sections are reported in the 1-500 eV interval. The experimental differential cross sections were determined using a crossed electronbeam-molecular-beam geometry, whereas the absolute values of the cross sections were obtained using the relative-flow technique. Theoretically, a complex optical potential was used to represent the collision dynamics, and a single-center expansion method combined with the Pade approximant method was used to solve the scattering equations. Our experimental data are in good agreement with the present calculated data but strongly disagree with those reported in a previous investigation.

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“…The largest deviations at low energy occur in the near-forward direction. At 15 and especially 20 eV, the calculated DCS is larger than the measured DCS at intermediate angles; as we have noted elsewhere [30], this behavior probably reflects overestimation of the intermediate-angle elastic scattering at energies where the neglected inelastic channels (ionization, in particular) have significant cross sections and thus should be treated as open and/or accounted for by an absorbing potential [31][32][33][34][35].…”

Section: Resultsmentioning

confidence: 57%