Absolute transition probability measurement of valence-shell electronic structure of CF4 and CCl4: Bethe surfaces, and dipole-dominated preionization-edge valence and Rydberg states

Ying, Ji; Leung, K. T.

doi:10.1063/1.466911

Cited by 29 publications

(19 citation statements)

References 64 publications

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“…The detailed assignments of the valence shell excited states for CCl 4 were made by Ho . The only available GOSs of the excited states at 5–11.5 eV for CCl 4 were reported by Ying and Leung with a 2500 eV impact energy and a low energy resolution of 800 meV. In addition, there are many investigations focusing on the ionization and dissociation processes of CCl 4 , − which are also important for studying the evolution of chlorine in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Generalized Oscillator Strengths for the Valence Shell Excitations in Carbon Tetrachloride Studied by Fast Electron Impact

Wang

et al. 2022

J. Phys. Chem. A

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A joint experimental and theoretical investigation of the valence shell excitations of carbon tetrachloride has been performed by fast electron scattering and time dependent density functional theory calculations. At a collision energy of 1.5 keV and an energy resolution of about 70 meV, the dipole-forbidden transition of a1σ* ← 2t1 has been clearly observed at large momentum transfers, and its excitation energy of 6.15 eV and line width of 0.72 eV have been determined. Two new features are also recognized at 9.97 and 10.26 eV. The generalized oscillator strengths of the excited states at 5–11.3 eV have been determined from the measured spectra. The calculated generalized oscillator strength of the a1σ* ← 2t1 transition with the vibronic effect shows better agreement with the experiment, and the vibronic effect also accounts for its nonzero intensity at zero squared momentum transfer. The optical oscillator strengths of the valence shell excitations have also been obtained by extrapolating the generalized oscillator strengths to the limit of zero squared momentum transfer. The integral cross sections have been systematically determined from the threshold to 5000 eV by means of the BE-scaling method. The present oscillator strengths and cross sections provide the fundamental data of carbon tetrachloride and have important applications in photochemical modeling for atmospheric physics.

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Section: Introductionmentioning

confidence: 99%

Generalized Oscillator Strengths for the Valence Shell Excitations in Carbon Tetrachloride Studied by Fast Electron Impact

Wang

et al. 2022

J. Phys. Chem. A

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“…Electron impact studies include measurements on electron energy loss [33][34][35][36][37][38][39][40][41], excitation [42], ionization observing total [43,44], total dissociation [45] and partial ionization cross sections using fragment ion mass analysis [42,[46][47][48][49][50][51][52]. Furthermore, binary (e, 2e) studies [53,54] and electron impact fragment ion-photon coincidences (FIPCO) [55] were performed.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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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 + .

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“…Employing further results from the widely used independent atom model, the calculation of difference diffraction patterns can be condensed into a simple and appealing form, Eq. (32).…”

Section: Discussionmentioning

confidence: 99%

“…This static approximation can be deduced from qualitative considerations and inferred from somewhat limited experimental and theoretical data (e.g., [31][32][33][34][35]). …”

Section: Static Approximationmentioning

confidence: 99%

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Theory of time-resolved inelastic x-ray diffraction

2010

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Starting from a general theory of time-resolved x-ray scattering, we derive a convenient expression for the diffraction signal based on a careful analysis of the relevant inelastic scattering processes. We demonstrate that the resulting inelastic limit applies to a wider variety of experimental conditions than similar, previously derived formulas, and it directly allows the application of selection rules when interpreting diffraction signals. Furthermore, we present a simple extension to systems simultaneously illuminated by x rays and a laser beam.

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Absolute transition probability measurement of valence-shell electronic structure of CF4 and CCl4: Bethe surfaces, and dipole-dominated preionization-edge valence and Rydberg states

Cited by 29 publications

References 64 publications

Generalized Oscillator Strengths for the Valence Shell Excitations in Carbon Tetrachloride Studied by Fast Electron Impact

Generalized Oscillator Strengths for the Valence Shell Excitations in Carbon Tetrachloride Studied by Fast Electron Impact

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

Theory of time-resolved inelastic x-ray diffraction

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