Elastic scattering and vibrational excitation of CO<sub>2</sub>by 4, 10, 20 and 50 eV electrons

Register, D. F.; Nishimura, Hiroyuki; Trajmar, S.

doi:10.1088/0022-3700/13/8/019

Cited by 78 publications

(86 citation statements)

References 4 publications

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“…8 along with the experimentally derived values of Lowke et al, 4 Shyn et al, 5 Register et al, 7 Tanaka et al, 27 and Gibson et al 28 Between 10 and 30 eV, our calculated MTCS is in fair agreement with the values of Register et al 7 and of Tanaka et al 27 The small discontinuity near 19 eV is due to the changeover in 2 ⌺ g symmetry from SEP results at lower energies to SE results. Some of the differences be- tween our calculated values and those derived from experiment may arise from uncertainties in the extrapolation of the measured DCSs to 180°.…”

Section: Resultssupporting

confidence: 89%

“…Fully testing this hypothesis will require going beyond the adiabatic approximation. Figure 7 shows our calculated elastic DCSs along with measurements of Register et al, 7 Kanik et al, 14 Tanaka et al, 27 Gibson et al, 28 and calculated values of Morrison et al, 16 where available. At 4 and 10 eV, our calculated DCSs show a single minimum at about 100°, as do the measured values.…”

Section: Resultsmentioning

confidence: 99%

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Collisions of low-energy electrons with CO2

Lee

Winstead

McKoy

1999

The Journal of Chemical Physics

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We report cross sections for collisions of low-energy electrons with carbon dioxide obtained by the Schwinger multichannel variational method. Elastic cross sections are obtained in the static-exchange-plus-polarization approximation. We pay particular attention to the position of the 2 ⌸ u resonance and to the strong enhancement in the integral cross section near zero energy, both prominent features whose accurate treatment requires an accounting for polarization effects. To include such effects in the resonant symmetry, we use an objective and physically motivated criterion to construct a set of configurations that accurately accounts for polarization while avoiding overcorrelation. In addition, we study the origin of the nonisotropic behavior of the elastic differential cross section at very low energies and conclude that it is caused by significant contributions from vibrationally excited CO 2 . Cross sections from threshold to 50 eV for excitation of the, and 1 ⌺ u Ϫ states that arise from the (1 g˜2 u ) transition are presented for the first time.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Collisions of low-energy electrons with CO2

Lee

Winstead

McKoy

1999

The Journal of Chemical Physics

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“…The excitation of the ν 2 + ν 6,8 has a peculiar property, however, similar to that reported earlier for CO 2 [50,51]-the cross section drops to zero at 0…”

Section: Discussionsupporting

confidence: 82%

“…2. A similar observation has already been made by Trajmar and co-workers for CO 2 , where the symmetries of the resonance and the vibrational states are the same as in the present case (except that there is no π g vibration) [50,51].…”

Section: Cross Sections For Vibrational Excitationsupporting

confidence: 90%

Absolute angle-differential vibrational excitation cross sections for electron collisions with diacetylene

et al. 2011

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Absolute vibrational excitation cross sections were measured for diacetylene (1,3-butadiyne). The selectivity of vibrational excitation reveals detailed information about the shape resonances. Excitation of the C≡C stretch and of double quanta of the C−H bend vibrations reveals a 2 u resonance at 1 eV (autodetachment width ∼30 meV) and a 2 g resonance at 6.2 eV (autodetachment width 1-2 eV). There is a strong preference for excitation of even quanta of the bending vibration. Excitation of the C−H stretch vibration reveals σ * resonances at 4.3, 6.8, and 9.8 eV, with autodetachment widths of ∼2 eV. Detailed information about resonances permits conclusions about the mechanism of the dissociative electron attachment.

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“…As an illustration, we have presented our results for differential cross-section (DCS) of the elastic electron scattering of CO 2 molecule at electron impact energy 20 and 30 eV in the Figure 1. Our results are compared with existing experimental data [2][3][4][5][6] for this process to assess the accuracy of the method and we observed good agreement. Details of the method to obtain the static potential along with the description of full optical potential model can be followed from our earlier paper [1].…”

Section: Resultsmentioning

confidence: 65%