Dissociative photoionization of CF4 from 23 to 120 eV

Masuoka, Toshio; Kobayashi, Aki

doi:10.1063/1.481942

Cited by 19 publications

(16 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, a weak contribution of the (4a 1 ) −1 state is observed. Comparing the earlier studies for the formation of the CF 3 + ion, this is in agreement with TPEPICO studies [4,20,26] while the PEPICO [24] and TPEFCO [? ] studies did not identify the weak contribution of the (4a 1 ) −1 orbital.…”

Section: Fragment Ion Time Of Flight (Tof) Spectrum Of Cfsupporting

confidence: 77%

“…Masuoka and Kobayashi [20] also observed similar results but did not observe the small contribution of the 1e orbital. The electron impact dissociative ionization study [48], found appearance energy below 20 eV and concluded the contribution of the (1e) −1 state.…”

Section: Cf 2 +supporting

confidence: 69%

“…Studies of photon induced reactions include fluorescence measurements [6], photoabsorption [7], photoelectron spectrometry a e-mail: alexander.dorn@mpi-hd.mpg.de [8][9][10][11][12][13][14], threshold photoelectron spectroscopy (TPES) [15][16][17][18], photoion detection [19,20] and various coincidence methods like photoelectron-photoion coincidences (PEPICO) [21][22][23][24], threshold photoelectron-photoion coincidences (TPEPICO) [4,25,26] and threshold photoelectron-fluorescence coincidences (TPEFCO) [5]. Photo double ionization was studied using photoion-photoion coincidences (PIPICO) [27][28][29], photoelectron-photoelectron coincidences (PEPECO) [30] and threshold photoelectron-photoion-photoion coincidences after core ionization (TPEPIPICO) [31].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An (e, 2e+ ion) study of electron-impact ionization and fragmentation of tetrafluoromethane at low energies

et al. 2018

View full text Add to dashboard Cite

Abstract. We study ionization and fragmentation of tetrafluoromethane (CF4) molecule induced by electron impact at low energies (E0 = 38 and 67 eV). We use a reaction microscope combined with a pulsed photoemission electron beam for our experimental investigation. The momentum vectors of the two outgoing electrons (energies E1, E2) and one fragment ion are detected in triple coincidence (e, 2e + ion). After dissociation, the fragment products observed are CF3 + , CF2 + , CF + , F + and C + . For CF3 + and CF2+ channels, we measure the ionized orbitals binding energies, the kinetic energy (KE) of the charged fragments and the two-dimensional (2D) correlation map between binding energy (BE) and KE of the fragments. From the BE and KE spectra, we conclude which molecular orbitals contribute to particular fragmentation channels of CF4. We also measure the total ionization cross section for the formation of CF3 + and CF2 + ions as function of projectile energy. We compare our results with earlier experiments and calculations for electron-impact and photoionization. The major contribution to CF3 + formation originates from ionization of the 4t2 orbital while CF2+ is mainly formed after 3t2 orbital ionization. We also observe a weak contribution of the (4a1) −1 state for the channel CF3 + .

show abstract

Section: Fragment Ion Time Of Flight (Tof) Spectrum Of Cfsupporting

confidence: 77%

Section: Cf 2 +supporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An (e, 2e+ ion) study of electron-impact ionization and fragmentation of tetrafluoromethane at low energies

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Statistical activated complex theories, namely, the quasiequilibrium theory of mass spectra of Rosenstock et al [9] can, in general, account reasonably well for PICSs in hydrocarbons [10,11], although performs poorly for highly fluorinated or PFC species. The poor performance for PFCs is due to a breakdown of the statistical approximation: Impulsive dissociation may occur directly from some excited states, and hence, fragment ions can exhibit high kinetic-energy release (KER) [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. The inadequacy of statistical models for the PFCs means that accurate experimental characterization of PICSs for such species, in particular, for groups of related structures, is important both for gaining further insight into the fundamental dynamics of ionization and for aiding interpretation of mass spectra in analytical applications.…”

Section: Introductionmentioning

confidence: 99%

Electron-impact-ionization dynamics of five C2to C4perfluorocarbons

et al. 2013

View full text Add to dashboard Cite

Reprinted with permission from the American Physical Society: Phys. Rev. A 88, 062710 c (2013) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Perfluorocarbons (PFCs) are man-made compounds whose ion physics exhibit complex interplays between statistical and nonstatistical fragmentation and intramolecular rearrangement processes. One probe of such processes is the energy-dependent electron-impact-ionization cross section. Partial electron-impact-ionization cross sections are reported for the fragments arising from five C 2 to C 4 PFCs, namely, C 2 F 6 , C 3 F 8 , C 3 F 6 , CF 2 =CF-CF=CF 2 , and CF 3 -C≡C-CF 3 , over the energy range from threshold to ∼210 eV. Care was taken to maximize ion collection efficiency and to minimize discrimination against ions produced with high kinetic-energy release, and the measured cross sections have been calibrated using independent absolute total (gross) ionization efficiency curves measured previously in the same laboratory with an instrument that was designed to essentially have unit detection efficiency. Total ionization cross sections have also been modeled using the binary-encounter Bethe model, and the shortcomings of the model when applied to perfluorinated compounds are discussed. Analysis of the mass spectral fragmentation patterns in combination with ab initio energetics suggests that nonstatistical dissociative ionization processes play a significant role in the fragmentation dynamics of saturated PFCs. In contrast, unsaturated PFCs exhibit long-lived parent ions, which tend to undergo a higher degree of statistical dissociation following ionization, involving considerable intramolecular rearrangement.

show abstract

“…In the last few years modern experimental techniques such as double charge transfer spectroscopy [1][2][3], time-of-flight mass spectrometry [4], photoion and photoelectron coincidence spectroscopy [5][6][7] and threshold photoelectron coincidence (TPEsCO) [8] allowed for a detailed analysis of double ionization processes and a characterization of the resulting fragments. In these processes atoms, molecules or clusters are irradiated by photons of sufficient energy to produce at least two photoelectrons and dications that undergo fragmentation in most cases.…”

Section: Introductionmentioning

confidence: 99%

The four-component two-particle propagator for the calculation of double-ionization spectra of heavy-element compounds: I. Method

Pernpointner¹

2010

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

View full text Add to dashboard Cite

To cite this version:Markus Pernpointner. The four-component two-particle propagator for the calculation of doubleionization spectra of heavy-element compounds: I. Method. Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 2010, 43 (20) AbstractIn this work we present a new four-component implementation of the two-particle (2p) propagator as a powerful tool for calculating double ionization spectra of systems containing heavy elements.The 2p-propagator approach provides immediate access to the complete final state distribution of doubly ionized systems together with a detailed configurational information of each final state.This information is vital for the analysis of electronic decay processes as radiationless relaxation mechanisms after an initial core hole ionization and for the simulation of Auger spectra. The capabilities of the four-component realization is first demonstrated at the xenon atom and the bromine molecule for which experimental results are available. It turns out that a relativistic treatment is required for an adequate description of the experimental findings. In this first paper we focus on the electronic structure described by the 2p-propagator and will later on apply this method to the calculation of Auger spectra and electronic decay processes in heavy systems. *

show abstract

Dissociative photoionization of CF4 from 23 to 120 eV

Cited by 19 publications

References 50 publications

An (e, 2e+ ion) study of electron-impact ionization and fragmentation of tetrafluoromethane at low energies

An (e, 2e+ ion) study of electron-impact ionization and fragmentation of tetrafluoromethane at low energies

Electron-impact-ionization dynamics of five C2to C4perfluorocarbons

The four-component two-particle propagator for the calculation of double-ionization spectra of heavy-element compounds: I. Method

Contact Info

Product

Resources

About