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Electron ionization of methane: The dissociation of the methane monocation and dication
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10.1063/1.3519636
/content/aip/journal/jcp/134/2/10.1063/1.3519636
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/2/10.1063/1.3519636

Figures

Image of FIG. 1.
FIG. 1.

A typical pairs spectrum recorded following ionization of CH4 at an electron energy of 200 eV, showing the ion pairs formed via dissociation of CH4 2+.

Image of FIG. 2.
FIG. 2.

The relative PICS σr[X] (diamonds) for forming fragment ions following electron ionization of CH4. The corresponding values extracted from the data of Straub et al. (Ref. 4) (squares), Tian and Vidal (Ref. 3) (triangles), Chatham et al. (Ref. 8) (circles), and Adamczyk et al. (Ref. 20) (inverted triangles) are also shown for comparison. The filled symbols correspond to the species represented on the left hand axes and the open symbols correspond to that on the right hand axes. Error bars are shown only for representative points. The error bar represents six (± 3σ) standard deviations of four separate determinations. Error limits for every point are listed in Tables I and II. The data of Gluch et al. (Ref. 14) are in good agreement with Straub et al. (Ref. 4) and Tian and Vidal (Ref. 3).

Image of FIG. 3.
FIG. 3.

The relative precursor-specific PICS for forming fragment ions following single (triangles), double (squares), and triple (circles) electron ionizations of CH4. The filled symbols correspond to the species represented on the left hand axes and the open symbols correspond to that on the right hand axes. Error bars are shown only for representative points. The error bar represents six (± 3σ) standard deviations of four separate determinations. Error limits for every point are listed in Tables I and II.

Tables

Generic image for table
Table I.

The relative partial ionization cross sections of methane for ionizing electron energies E between 30 and 200 eV. The values are expressed relative to the cross section for forming CH4 +. The values in parentheses represent three standard deviations in the last figure.

Generic image for table
Table II.

The relative precursor-specific partial ionization cross sections of methane for ionizing electron energies E between 30 and 200 eV. The values are expressed relative to the cross section for forming CH4 +. The values in parentheses represent one standard deviation in the last figure.

Generic image for table
Table III.

Dissociation processes, and their relative intensities R, forming pairs of ions following multiple ionization of CH4 at an electron energy of 200 eV.

Generic image for table
Table IV.

The kinetic energy released (KER) upon fragmentation of CH4 2+ following electron ionization of CH4 at 55 eV. For those fragmentation channels which were best modeled by two KERs, the second KER is shown along with the weighted average. The energy of the dissociation asymptote is the energy of the ground states of the dissociation products relative to the ground state of the neutral methane molecule. The precursor state energy P represents the energy of the CH4 2+ state which fragments to the observed products, see text for details. The values in parentheses represent the uncertainty in the last figure.

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/content/aip/journal/jcp/134/2/10.1063/1.3519636
2011-01-12
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron ionization of methane: The dissociation of the methane monocation and dication
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/2/10.1063/1.3519636
10.1063/1.3519636
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