Rotational Excitation by Slow Electrons

Gerjuoy, E.; Stein, S.

doi:10.1103/physrev.97.1671

Cited by 274 publications

(73 citation statements)

References 14 publications

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“…29 However, benzene has a substantial quadrupole moment, 30 and the resulting 1/r 3 potential will give rise to a nonzero scattering cross section at zero energy for lϾ0. [31][32][33] Indeed, using the measured quadrupole moment, 30 one can estimate the magnitude of the quadrupole-induced scattering within the Born approximation 32 as about 13ϫ10 Ϫ16 cm 2 , a value which appears roughly consistent with the summed results of Gianturco and Lucchese. However, it is not possible to say from the data presented in their paper whether the results of Gianturco and Lucchese are consistent with the quadrupole mechanism, which also predicts isotropic scattering and an energy-independent cross section.…”

Section: Discussionsupporting

confidence: 69%

Elastic scattering of low-energy electrons by benzene

Bettega

Winstead

McKoy

2000

The Journal of Chemical Physics

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We present elastic cross sections obtained from ab initio calculations for low-energy electron scattering by benzene, C 6 H 6 . The calculations employed the Schwinger multichannel method as implemented for parallel computers within both the static-exchange and staticexchange-polarization approximations. We compare our results with other theoretical calculations and with available experimental data. In general, agreement is good.

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Section: Discussionsupporting

confidence: 69%

Elastic scattering of low-energy electrons by benzene

Bettega

Winstead

McKoy

2000

The Journal of Chemical Physics

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“…(1) of Stubbe and Varnum (1972). Using the quadrupole Born approximation formula for rotational excitation cross sections given by Gerjuoy and Stein (1955), and making use of the fact that the rotational states are so close together that the summation can be changed into an integration (Mentzoni and Row, 1963), the electron cooling rate by means of rotational excitation of N 2 v 0 can be calculated as…”

Section: Discussionmentioning

confidence: 99%

“…Using the formula of Mentzoni and Row (1963) and rotational excitation cross sections given by Gerjuoy and Stein (1955) the rate of electron cooling through rotational excitation was approximated by analytical formula (Stubbe, 1971;Stubbe and Varnum, 1972) which is used in models of the ionosphere. Taking into account the comparison of theoretical and experimental cross sections given by Robertson et al (1997), this rate of electron cooling must be multiplied by a factor of 1.255 (see Appendix).…”

Section: Introductionmentioning

confidence: 99%

New electron energy transfer rates for vibrational excitation of N<sub>2</sub>

Павлов¹

1998

Ann. Geophys.

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Abstract. In this paper we present the results of a study of the electron cooling rate, the production rates of vibrationally excited N 2 v , and the production frequency of the N 2 vibrational quanta arising from the collisions of electrons with unexcited N 2 0 and vibrationally excited N 2 1 molecules as functions of the electron temperature. The electron energy transfer rates for vibrational excitation of N 2 have been calculated and ®t to analytical expressions by use of the revised vibrationally excited N 2 cross sections. These new analytical expressions are available to the researcher for quick reference and accurate computer modeling with a minimum of calculations.

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“…dΩ [21]. The data for physisorbed H 2 as well as gas phase H 2 peak in the energy range 3.5 − 4.5 eV and are obviously related to the 2 Σ u resonance.…”

Section: B Elastic Scatteringmentioning

confidence: 99%

“…The differential cross sections for excitation of the H 2 vibration and rotation via the 2 Σ u resonance depend on the initial H 2 rotation state. Theoretical predictions [21] give the relative magnitude dσ 0→2…”

Section: B Elastic Scatteringmentioning

confidence: 99%

Excitation and desorption of physisorbed H2 via theΣu2 electron scattering resonance

Andersson

Svensson

2017

The Journal of Chemical Physics

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Our high-resolution electron energy-loss measurements concern physisorbed H2 and comprise differential cross sections for excitation of the internal H2 modes and the H2-surface bonding mode and their combinations and extend over the electron impact energy range of the classical low-energy H2 2 Σu resonance. Comparison with corresponding data for excitation of the internal modes of gas phase H2 reveals that strong elastic electron reflectivity from the Cu(100) substrate profoundly distorts the inelastic scattering pattern for physisorbed H2. We find that this influence can be corrected for and that the resulting peak cross sections agree with the H2 gas phase data, in accordance with theoretical predictions for excitation of the internal H2 vibration. We have used corrected cross sections for the rotational mode spectra of physisorbed H2, HD and D2 in a model concerning electron induced desorption via rotation-translation energy conversion. These spectra include transitions from the ground state as well as excited levels of the physisorption potential well. H2 and HD can desorb from all levels while D2, for energetic reason, can only desorb from the excited levels. This model gives a satisfactory account of the observed desorption cross sections and predicts characteristic velocity distributions of the desorbing molecules. The cross section data for H2 and HD reveals that direct bound-free transitions also contribute to the electron induced desorption.

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Rotational Excitation by Slow Electrons

Cited by 274 publications

References 14 publications

Elastic scattering of low-energy electrons by benzene

Elastic scattering of low-energy electrons by benzene

New electron energy transfer rates for vibrational excitation of N<sub>2</sub>

Excitation and desorption of physisorbed H2 via theΣu2 electron scattering resonance

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Rotational Excitation by Slow Electrons

Cited by 274 publications

References 14 publications

Elastic scattering of low-energy electrons by benzene

Elastic scattering of low-energy electrons by benzene

New electron energy transfer rates for vibrational excitation of N&lt;sub&gt;2&lt;/sub&gt;

Excitation and desorption of physisorbed H2 via theΣu2 electron scattering resonance

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New electron energy transfer rates for vibrational excitation of N<sub>2</sub>