Electron impact excitation cross section studies of methane and acetylene

Pang, Kevin D.; Ajello, J. M.; Franklin, B. J.; Shemansky, D. E.

doi:10.1063/1.452077

Cited by 37 publications

(32 citation statements)

References 32 publications

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“…Beside Lyman-α and -β emissions, Pang et al [13] reported also the observation of CI emissions at 165.7 nm and measured the threshold energies.…”

Section: →Xmentioning

confidence: 99%

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The dissociative ionization of C2H2. The C+, C2+ and CH2+ dissociation channels. The vinylidene ion as a transient?

Locht¹,

Davister²

1995

Chemical Physics

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The dissociative electroionization of C 2 H 2 has been investigated in the C + , C 2 + and CH 2 + dissociation channels. Both the translational energy and the appearance energies of these three ions have been measured. The kinetic energy versus appearance energy diagrams related to each of these species are discussed in detail and dissociation mechanisms are proposed for all observed onset energies. For the three ionic species, the dissociation pathways leading to the fragmentation of C 2 H 2 + into C + , C 2 + and CH 2 + , successively, have to run very likely over an isomerisation mechanism of the molecular ion. The isomeric vinylidene structure could be the most probable intermediate.

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“…Beside Lyman-α and -β emissions, Pang et al [13] reported also the observation of CI emissions at 165.7 nm and measured the threshold energies.…”

Section: →Xmentioning

confidence: 99%

“…A comparison could only be made with the results of the dissociative excitation experiments of C 2 H 2 giving rise to CI(3s, 1 P) emission at 193.1 nm [12] and 165.72 nm [13]. The onset for CI(3s, Table 1).…”

Section: Straight Line (5) Inmentioning

confidence: 99%

The dissociative ionization of C2H2. The C+, C2+ and CH2+ dissociation channels. The vinylidene ion as a transient?

Locht¹,

Davister²

1995

Chemical Physics

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“…In contrast to photo-excitation, electron impact implies also optically forbidden excited states and monitors their subsequent decay to lower states. Pang et al investigated electron impact emission cross sections for CH 4 and C 2 H 2 in the VUV region from 40 to 200 nm [17]. Three studies are most related to the present study since electrons were used as projectiles and fluorescence signals in the VIS/UV range were recorded.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the broad field of applications for studies on methane an extended number of previous experimental investigations on electron ionization (see [13,14]), electron attachment [15,16] and dissociative electron impact excitation can be found in the literature for this molecule [17][18][19][20]. Emission spectra for electron projectiles [11][12][13][14] as well as for photo-excitation [21][22][23] were reported.…”

Section: Introductionmentioning

confidence: 99%

“…They investigated the electron energy range from threshold up to 1 keV and determined the appearance energies for some of the transitions mentioned. All references on electron impact of methane [17][18][19][20] investigated also the high energy range in which Fano plots reveal the optical activity of the investigated transition. It turned out that most fragments formed in electron impact excitation are formed from the ground state of CH 4 via optically forbidden states.…”

Section: Introductionmentioning

confidence: 99%

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Electron impact excitation of methane: determination of appearance energies for dissociation products

Danko

Országh

Ďurian

et al. 2013

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

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In this work, we present an experimental study of dissociative excitation of CH 4 utilizing a crossed electron molecular beam experiment. Methane was excited by nearly monochromatic electrons generated by a trochoidal electron monochromator. The dissociative products were identified on the basis of the emission spectra in the ultraviolet-visible (UV/VIS) spectral range. The excitation functions were recorded as the function of the electron energy for different emission bands of the fragments (Balmer series for H: n = 3,4 . . . 9→2, and moreover, CH: A 2 →X 2 , CH: B S 0 ). From the experimental data we have determined the threshold energies for excitation of particular fragments. Present experimental results indicate that the threshold energies for some dissociative excitation channels could be lower by ∼1-2 eV in comparison to earlier studies and indicate that different dissociative processes may be operative at the threshold than assumed in the former studies.

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Cross Sections and Reaction Rates of Relevance to Aeronomy

Fox

1991

Reviews of Geophysics

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Experimental and theoretical data relevant to models and measurements of the chemical and thermal structures and luminosity of the thermospheres of the Earth and planets published during the last four years are surveyed, and those in which one or more authors is affiliated with a U.S. institution are indicated. Among chemical processes, we include ion‐molecule reactions, dissociative recombination of molecular ions, and reactions between neutral species. Both reactions between ground state species and species in excited states are considered, including energy transfer and quenching. Measured and calculated cross sections for interactions of solar radiation with atmospheric species, such as photoabsorption, photoionization, and photodissociation and related processes are surveyed. Measurements and calculations of cross sections for elastic and inelastic scattering of particles, including electrons, protons, alpha particles, heavier ions, and neutral atoms are also surveyed.

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Electron impact excitation cross section studies of methane and acetylene

Cited by 37 publications

References 32 publications

The dissociative ionization of C2H2. The C+, C2+ and CH2+ dissociation channels. The vinylidene ion as a transient?

The dissociative ionization of C2H2. The C+, C2+ and CH2+ dissociation channels. The vinylidene ion as a transient?

Electron impact excitation of methane: determination of appearance energies for dissociation products

Cross Sections and Reaction Rates of Relevance to Aeronomy

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