Absolute oscillator strengths for valence-shell ionic photofragmentations of N2O and CO2 (8–75 eV)

Hitchcock, A. P.; Brion, C.E.; Wiel, M.J. van der

doi:10.1016/0301-0104(80)87015-7

Cited by 93 publications

(48 citation statements)

References 29 publications

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“…essentially those three identified by Domcke et al [39] as being 2 ∏ u states, only evolve CO + and O + ions in Ref. [14]. The present work shows unambiguously that C + ions are also produced.…”

Section: Discussionsupporting

confidence: 69%

“…The decomposition of these states plays a major role; they are probably all unstable (repulsive or pre-dissociated) in all three dissociative ionization channels. Hitchcock et al [14] published a tentative "dipole" breakdown scheme for fragmentation resulting from photoionization. In this crude scheme a number of dissociative ionization reaction paths of CO 2 + (MET states) were omitted.…”

Section: Discussionmentioning

confidence: 99%

“…The abundance of translational energy versus appearance energy diagrams has allowed the authors to disentangle a complex superposition of numerous processes [12,13]. Electron energy loss spectroscopy and electron-ion coincidence measurements have been performed [14]. Photofragmentation oscillator strengths in the C + , O + and CO + channels were determined in the valence-shell ionization region.…”

Section: Introductionmentioning

confidence: 99%

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The dissociative electroionization of carbon dioxide by low-energy electron impact. The C+, O+ and CO+ dissociation channels

Locht

Davister

1995

International Journal of Mass Spectrometry and Ion Processes

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This work reports the dissociative ionization of CO 2 between 19 and 40 eV. The three dissociation channels producing C + , O + and CO + are examined in detail. Translational energy distributions as a function of the impinging electron energy and the ionization efficiency for fixed minimum kinetic energy carried by the fragments are measured. The kinetic energy versus appearance energy diagram is obtained for the three fragment ions. When available, the present results are compared with previous measurements. The lowest appearance energy of O + and CO + corresponds to the predissocia-tion of the CO 2 + (C 2 Σ g + ) state. At higher energies, all the fragment ions are exclusively produced by the dissociative ionization of CO 2 in the multiple electron transition (MET) states. Predissociation is most probably the dominant mechanism. Each MET state branches off to produce not only the three fragments, but also the same fragment in two different states. This is observed for each dissociation channel, i.e. O + , CO + and/or C + . In the latter channel no evidence is found for the dissociative ionization reaction CO 2 + → C + + 2O.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The dissociative electroionization of carbon dioxide by low-energy electron impact. The C+, O+ and CO+ dissociation channels

Locht

Davister

1995

International Journal of Mass Spectrometry and Ion Processes

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“…References: as: cd: Crosswell & Dalgarno 1985;dl: Dalgarno & Lepp 1987;dmd: Dalgarno & McDowell 1956;fp: Frommhold & Pickett 1978;hasd: Herbst et al 1987;kah: Karpas et al 1979;lbh: Lee et al 1996;ljb: Linder et al 1995;lm: Larsson et al 1996;pdf: Pineau des Forêts et al 1986;rp: Ramaker & Peek 1976;s: Schilke et al 1992;saa: Smith et al 1982a,b;smt: Sidhu et al 1992;str: Strömholm et al 1995;w: Watson 1976;zm: Zhang & Miller 1989 Hitchcock et al 1980 the interaction of light ions with neutrals possessing a permanent electric dipole moment in excess of about 1 Debye. Table 3 gives electric dipole moments for the neutral molecules contained in this database.…”

Section: Dipole Momentsmentioning

confidence: 99%

The UMIST database for astrochemistry 1999

Teuff

Millar

Markwick

2000

Astron. Astrophys. Suppl. Ser.

305

297

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Abstract. We report a new version of the UMIST database for astrochemistry. The previous (1995) version has been updated and its format has been revised. The database contains the rate coefficients, temperature ranges and -where available -the temperature dependence of 4113 gas-phase reactions important in astrophysical environments. The data involve 396 species and 12 elements. We have also tabulated permanent electric dipole moments of the neutral species and heats of formation. A new table lists the photo process cross sections (ionisation, dissociation, fragmentation) for a few species for which these quantities have been measured. Data for Deuterium fractionation are given in a separate table. Finally, a new online Java applet for data extraction has been created and its use is explained in detail. The detailed new datafiles and associated software are available on the World Wide Web at http://www.rate99.co.uk.

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“…The N 2 dissociative photoionization and photoabsorption cross sections are adopted from Stolte et al [1998], Samson et al [1987] and Chan et al [1993a]. For CO 2 , we consider both single and double dissociative photoionization channels, with their cross sections taken from Masuoka [1994], Hitchcock et al [1980] and Siggel et al [1993]. The CO 2 photoabsorption cross sections are based on the work by Chan et al [1993b].…”

Section: Discussionmentioning

confidence: 99%

Suprathermal electron spectra in the Venus ionosphere

et al. 2011

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[1] In this study, a multistream kinetic model is used to derive the suprathermal electron intensity in the Venus ionosphere, to be compared with the observations made by the Analyzer of Space Plasmas and Energetic Atoms (ASPERA-4) Electron Spectrometer (ELS) instrument onboard Venus Express (VEx) on 18 May 2006. Input parameters of the model are chosen to be consistent with the detailed ephemeris information. We consider two cases for the magnetic field line configuration. The first assumes vertical magnetic field lines, while in the second the configuration is consistent with the VEx Magnetometer (MAG) measurements for that particular orbit. The model calculations suggest that the energy spectrum of suprathermal electrons not only depends on the local photoelectron production but is also strongly influenced by transport as well as energy degradation. We confirm the postulation of Coates et al. (2008) (2008). The model results indicate that the condition of local equilibrium is satisfied for suprathermal electrons below ∼155 km on Venus. However, transport becomes effective at higher altitudes, significantly altering the secondary electron production rate and leading to strongly anisotropic suprathermal electron flow. For the case with the MAG-derived, slanted magnetic field configuration, we make a data-model comparison in terms of both the absolute magnitude of the suprathermal electron intensity and the appearance of spectral peaks. The comparison suggests that the actual magnetic field lines are probably inclined more vertically than a simple extrapolation from the MAG measurements.

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Absolute oscillator strengths for valence-shell ionic photofragmentations of N2O and CO2 (8–75 eV)

Cited by 93 publications

References 29 publications

The dissociative electroionization of carbon dioxide by low-energy electron impact. The C+, O+ and CO+ dissociation channels

The dissociative electroionization of carbon dioxide by low-energy electron impact. The C+, O+ and CO+ dissociation channels

The UMIST database for astrochemistry 1999

Suprathermal electron spectra in the Venus ionosphere

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