Cross sections and ion kinetic energies for electron impact ionization of CH4

Głuch, K.; Scheier, P.; Schustereder, Werner; Tepnual, T.; Feketeová, Linda; Mair, C.; Matt-Leubner, S.; Stamatovic, A.; Märk, T.D.

doi:10.1016/s1387-3806(03)00199-4

Cited by 44 publications

(38 citation statements)

References 43 publications

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“…This is reasonable, because the polymerization reactions induced by the hydrocarbon radicals are largely suppressed by the primary radicals of OH and H formed from the major component H 2 O, which act as radical scavengers. The 100 eVelectron ionization cross sections for methane to produce CH þ 3 , CH þ 2 , CH + , and C + are 1:5 ; 10 À16 , 3:4 ; 10 À17 , 1:5 ; 10 À17 , and 5:5 ; 10 À17 cm À1 , respectively (Motohashi et al 1996;Gluch et al 2003;Shirai et al 2002). Thus, the generation of CH 2 does not seem to be a minor process.…”

Section: Discussionmentioning

confidence: 94%

Methanol Formation from Electron‐irradiated Mixed H₂O/CH₄Ice at 10 K

Wada

Mochizuki

Hiraoka

2006

ApJ

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In order to investigate the role of cosmic rays in the formation of methanol on dust grains, low-energy electron irradiation ($10-300 eV) on mixed H 2 O/CH 4 ice was studied by infrared (IR) spectroscopy and thermal desorption spectrometry (TDS). CH 3 OH was formed as a major product along with H 2 CO, C 2 H 4 , C 2 H 6 , and C 2 H 2 as minor products when the mixed H 2 O/CH 4 (10/1) ice was irradiated by electrons at 10 K. There were found to be two pathways for the formation of methanol with about equal importance, i.e., the recombination reaction, CH 3 þ OH ! CH 3 OH, and the insertion reaction, CH 2 þ H 2 O ! CH 3 OH. One CH 3 OH molecule was formed per 60 electron irradiations with an electron energy of 100 eV. By using mixed H 2 O/CD 4 ice, it was confirmed that formaldehyde was formed by the insertion reaction, C þ H 2 O ! H 2 CO.

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Section: Discussionmentioning

confidence: 94%

Methanol Formation from Electron‐irradiated Mixed H₂O/CH₄Ice at 10 K

Wada

Mochizuki

Hiraoka

2006

ApJ

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“…Absolute measurements of the total ionization in CH 4 up to 200 eV by Vallance et al 83 gave a maximum of the cross section of 4.2 × 10 −16 cm 2 , i.e., slightly higher than the value of Nishimura and Tawara, but at higher energies, the cross sections of Vallance et al decrease too rapidly with energy. Tian and Vidal 84,85 used a time-of-flight spectrometer and normalized their partial cross sections to the Ar + cross section of Straub et al 81 Gluch et al 86 measured partial cross sections using a double-focusing mass spectrometer and normalized at 100 eV to the total cross section by Rapp and Englander-Golden; in Fig. 15 we show their data re-normalized by a factor of πa 2 0 , i.e., to the original data of Rapp and Englander-Golden.…”

Section: Ionization Cross Sectionmentioning

confidence: 99%

“…Comparison of experimental partial ionization cross section for electron scattering from methane. The cross sections by Gluch et al 86 are re-normalized by a factor of πa 2 0 . The relative cross sections of Ward et al 89 are normalized to CH + 4 cross sections (present recommended data).…”

Section: Numerical Interpolationsmentioning

confidence: 99%

“…For impact ionization by 200 eV electrons Wang and Vidal 92 stated: "All the alkane dications are unstable and dissociate mostly into ion pairs, in which the production of proton pairs is found to be a major dissociation channel." Gluch et al86 measured the kinetic energies of ions produced in electron-impact ionization. While CH + 4 ions appear with only one value of the postcollision kinetic energy, other ions show more complex patterns.…”

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confidence: 99%

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Cross Sections for Electron Collisions with Methane

Song¹,

Yoon²,

Cho

et al. 2015

Journal of Physical and Chemical Reference Data

131

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Cross section data are compiled from the literature for electron collisions with nitrogen trifluoride (NF 3) molecules. Cross sections are collected and reviewed for total scattering, elastic scattering, momentum transfer , excitations of rotational and vibrational states, dissociation, ionization, and dissociative attachment. For each of these processes, the recommended values of the cross sections are presented. The literature has been surveyed up to the end of 2016.

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“…On the other hand, it has been known that hydrogen molecular ions, H 2 + are formed when hydrocarbon molecules are ionized by electron impact [3] and by irradiation of vacuum ultraviolet light [4]. Recently, such elimination of H 2 + was identified for methanol molecules when they are irradiated with a short-pulsed intense laser light, and the structural deformation induced by the intense laser field was considered to promote the formation of H 2 + [5].…”

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confidence: 99%