Applications of the Schwinger Multichannel method with pseudopotentials to electron scattering from polyatomic molecules II: rotational excitation cross sections

Varella, Márcio T. do N.; Bettega, M. H. F.; Natalense, Alexandra P. P.; Ferreira, L. G.; Lima, Margareth Guimarães

doi:10.1590/s0103-97332001000100004

Cited by 7 publications

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“…Especially in the low-energy region where the projectile spends a longer time with the target molecule, the coupling between the electronic and rovibrational motions is relevant and must be adequately treated. To tackle this situation, approaches with different coupling schemes, namely, the adiabatic nuclei (AN) model [5], the rotational laboratory-frame close-coupling (LFCC) approximation [6][7][8][9], the body-frame vibrational close-coupling (BFVCC) approximation [6][7][8][9], etc, can be employed in such studies. However, the applicability of the different theoretical methods depends on the energy of the incident particle.…”

Section: Introductionmentioning

confidence: 99%

Vibrational cross sections for positron scattering by nitrogen molecules

et al. 2010

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We present a systematic study of low-energy positron collision with nitrogen molecules. Vibrational elastic and excitation cross sections are calculated using the multichannel version of the continued fractions method in the close-coupling scheme for the positron incident energy up to 20 eV. The interaction potential is treated within the static-correlation-polarization approximation. The comparison of our calculated data with existing theoretical and experimental results is encouraging.

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Section: Introductionmentioning

confidence: 99%

Vibrational cross sections for positron scattering by nitrogen molecules

et al. 2010

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“…The rows distinguish between different transitions. Red lines: present work; orange lines:Machado et al (2002); purple lines:Brescansin et al (1989); dark blue lines:Jain and Thompson (1983); light blue lines:Varella et al (2001); green circles:Müller et al (1985).…”

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confidence: 99%

R-matrix calculations of low-energy electron collisions with methane

Brigg

Tennyson

Plummer

2014

J. Phys. B: At. Mol. Opt. Phys.

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R-matrix calculations are performed for electron collision with CH 4 at energies between 0.02 and 15 eV using a series of different ab initio models for both the target and the full scattering system. A target model similar to the standard multi-reference configuration interaction used in electronic structure calculations is found to give the best results. Results are presented for elastic scattering, with particular emphasis on the Ramsauer-Townsend miminum, and for rotational excitation, momentum transfer and electron impact dissociation. Extensive comparisons are made with previous studies.

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Excitation of the symmetric and antisymmetric stretch vibrations of H₂O by electron impact

Allan

Moreira

2001

J. Phys. B: At. Mol. Opt. Phys.

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Electron energy loss spectra recorded at 135 • at constant scattered electron energies of 0.05, 0.6 and 3.0 eV, and with 10 meV resolution, reveal that the antisymmetric stretch vibration (001) is excited much less than the symmetric stretch vibration (100). Spectra subtraction indicates that the (001) level is excited about 5× less than (100) at 1 eV. Band profiles recorded 0.6 eV above threshold show that the J = 0 branch dominates the excitation of (010) and (100) vibrations but is absent for the (001) vibration. This indicates that resonant excitation is decisive for the (010) and (100) states but direct dipole mechanism for (001). The R-matrix adiabatic nuclei theory with closure approximation reproduces well the cross section for the (010) state, but dramatically underestimates the cross section for the symmetric stretch vibration and overestimates the cross section for the asymmetric stretch vibration.

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Applications of the Schwinger Multichannel method with pseudopotentials to electron scattering from polyatomic molecules II: rotational excitation cross sections

Cited by 7 publications

References 0 publications

Vibrational cross sections for positron scattering by nitrogen molecules

Vibrational cross sections for positron scattering by nitrogen molecules

R-matrix calculations of low-energy electron collisions with methane

Excitation of the symmetric and antisymmetric stretch vibrations of H₂O by electron impact

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Applications of the Schwinger Multichannel method with pseudopotentials to electron scattering from polyatomic molecules II: rotational excitation cross sections

Cited by 7 publications

References 0 publications

Vibrational cross sections for positron scattering by nitrogen molecules

Vibrational cross sections for positron scattering by nitrogen molecules

R-matrix calculations of low-energy electron collisions with methane

Excitation of the symmetric and antisymmetric stretch vibrations of H2O by electron impact

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Product

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Excitation of the symmetric and antisymmetric stretch vibrations of H₂O by electron impact