Spin exchange in elastic<i>e</i>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>collisions

Fj, da Paixo; Lima, Marco A. P.; McKoy,

doi:10.1103/physrevlett.68.1698

Cited by 32 publications

(16 citation statements)

References 26 publications

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“…Some other calculations 7,8 for O 2 using different theoretical methods have also confirmed the observation by da Paixão et al. 5 Recently, we reported a theoretical investigation on spin-exchange effects in the elastic electron collisions with the open-shell C 2 O radical 9 using the iterative Schwinger variational method (ISVM). 10,11 In that study, we have shown that the exchange effects are strongly enhanced by the occurrence of shape resonances.…”

Section: Introductionsupporting

confidence: 85%

“…The present polarization fractions are calculated according to equation 14 using the rotationally summed spin-averaged DCSs and SF DCSs. Actually, the summation over rotational transitions is equivalent to the molecular orientations averaging procedure used by da Paixão et al 5 It is interesting to see in Figures 6 and 7 that our calculated rotationally-summed SPFs show strong oscillations in the resonance region and particularly at large scattering angles, and their magnitudes deviate significantly from 1. These results reinforce what was observed in our previous study for elastic e --C 2 O collisions, 9 that is, the spin-exchange effects between the scattered electron and the unpaired electrons of the target can be significantly enhanced by the occurrence of resonances.…”

Section: Resultsmentioning

confidence: 81%

“…Da Paixão et al 5,6 reported theoretical DCSs for elastic collisions of polarized and unpolarized electrons with O 2 and NO calculated using the Schwinger multichannel method. Their calculation provided an explanation for the small spin-exchange effects in elastic scattering from these targets as observed in the experiments.…”

Section: Introductionmentioning

confidence: 99%

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Spin-exchange effects in elastic electron scattering from linear triatomic radicals

Fujimoto¹,

Michelin²,

Arretche³

et al. 2010

J. Braz. Chem. Soc.

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Neste trabalho, apresentamos um estudo teórico sobre os efeitos de troca de spin no espalhamento elástico de elétrons por dois radicais livres triatômicos: NCN e CNN. São mostrados resultados de seções de choque diferencial e integral de polarização de spin (spin-flip) calculados na faixa de energia entre 1 a 10 eV. Para ambos os alvos, nosso estudo mostrou que a troca entre o projétil e o elétron desemparelhado do alvo é fortemente influenciada pela ocorrência de ressonâncias de forma. Como consequência disso, frações de polarização de grandes magnitudes só foram observadas na região de ressonância.In this work, we present a theoretical investigation on spin-exchange effects in elastic electron collisions by two linear triatomic free radicals namely, NCN and CNN. Spin-polarization differential and integral cross sections calculated in the (1-10) eV energy range are reported. For both targets, our study has shown that the exchange between the scattering and the unpaired target electrons is strongly influenced by the occurrence of shape resonances. As a consequence, significant spinpolarization fractions are only observed in the resonance region.

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Section: Introductionsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 81%

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Spin-exchange effects in elastic electron scattering from linear triatomic radicals

Fujimoto¹,

Michelin²,

Arretche³

et al. 2010

J. Braz. Chem. Soc.

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“…smoother was advanced by da Paixao et al 35 In this case they argued that the observed behavior is related to the random molecular orientations in the gas. We also note that we are currently extending our measurements to lower energies, with our preliminary results suggesting that molecular-like behavior becomes increasingly important as you go to the lower incident electron energies.…”

Section: -5mentioning

confidence: 87%

Substitution effects in elastic electron collisions with CH3X (X=F, Cl, Br, I) molecules

Kato

Asahina

Masui

et al. 2010

The Journal of Chemical Physics

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We report absolute elastic differential, integral, and momentum transfer cross sections for electron interactions with the series of molecules CH 3 X ͑X = F, Cl, Br, I͒. The incident electron energy range is 50-200 eV, while the scattered electron angular range for the differential measurements is 15°-150°. In all cases the absolute scale of the differential cross sections was set using the relative flow method with helium as the reference species. Substitution effects on these cross sections, as we progress along the halomethane series CH 3 F, CH 3 Cl, CH 3 Br, and CH 3 I, are investigated as a part of this study. In addition, atomic-like behavior in these scattering systems is also considered by comparing these halomethane elastic cross sections to results from other workers for the corresponding noble gases Ne, Ar, Kr, and Xe, respectively. Finally we report results for calculations of elastic differential and integral cross sections for electrons scattering from each of the CH 3 X species, within an optical potential method and assuming a screened corrected independent atom representation. The level of agreement between these calculations and our measurements was found to be quite remarkable in each case.

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“…Theoretical calculations of elastic scattering also predict small depolarizations for these molecules, apparently because significant effects that exist for specific orientations of the internuclear axis are washed out by angular averaging [12,13]. We note, however, that theoretical calculations of electron spin depolarization during collisions with triplet excited states of H 2 molecules find large average depolarization effects [14].…”

mentioning

confidence: 92%

Spin-Exchange-Induced Circularly Polarized Molecular Fluorescence

Green

Gallup²,

Rosenberry³

2004

Phys. Rev. Lett.

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Spin exchange in elastice-O2collisions

Abstract: Recent experiments using polarized electron beams have shown that spin-exchange effects for elastic collisions with 02 and NO are much smaller than for Na atoms. We report calculated spin-flip differential cross sections for elastic collisions

Cited by 32 publications

References 26 publications

Spin-exchange effects in elastic electron scattering from linear triatomic radicals

Spin-exchange effects in elastic electron scattering from linear triatomic radicals

Substitution effects in elastic electron collisions with CH3X (X=F, Cl, Br, I) molecules

Spin-Exchange-Induced Circularly Polarized Molecular Fluorescence

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