Energetics of the Ionization and Fragmentation of Phosphorus Trifluoride by Electron Impact

Torgerson, D.F.; Westmore, John B.

doi:10.1139/v75-131

Cited by 18 publications

(14 citation statements)

References 29 publications

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“…Absolute measurements were reported so far for electron transport and rate coefficients, 13,16 electron-impact ionization, 14 and dissociative electron attachment 14,20,21 cross sections. 17,27,28 More recently, electron stimulated desorption of positive and negative ions from PF 3 adsorbed on metal surfaces has been also studied. 25 In contrast to BF 3 , the study of electron-impact from PF 3 molecule has received much less attention.…”

Section: Introductionmentioning

confidence: 99%

Electron collisions with trifluorides: BF3 and PF3 molecules

Szmytkowski

Piotrowicz

Domaracka

et al. 2004

The Journal of Chemical Physics

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Absolute total cross sections (TCSs) for electron scattering from boron trifluoride (BF(3)) and phosphorus trifluoride (PF(3)) molecules have been measured using a linear transmission method. The electron energy ranges from 0.6 to 370 eV for BF(3) and from 0.5 to 370 eV for PF(3). The TCS energy dependence for BF(3) exhibits two very pronounced enhancements: resonantlike narrow feature located near 3.6 eV with the maximum value of 19.2 x 10(-20) m(2), and intermediate energy very broad enhancement with two humps, one centered around 21 eV (18.8 x 10(-20) m(2) in the maximum) and the other near 45 eV (19.5 x 10(-20) m(2)). For PF(3) the TCS has quite different low-energy dependence: at 0.5 eV it has a high value of 70 x 10(-20) m(2) and decreases steeply towards higher energies. Beyond the minimum near 5.5 eV, the TCS reveals two distinct humps: the resonant one centered near 11 eV with the peak value of 32.9 x 10(-20) m(2) and the second one much broader around 35 eV (27.9 x 10(-20) m(2)). The present TCSs for trifluorides are compared to each other as well as to previous TCS data for selected perfluorides and to results for their perhydrided counterparts. The differences and similarities in the shape and magnitude of TCSs are pointed out.

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Section: Introductionmentioning

confidence: 99%

Electron collisions with trifluorides: BF3 and PF3 molecules

Szmytkowski

Piotrowicz

Domaracka

et al. 2004

The Journal of Chemical Physics

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“…6,7 Adsorption studies of these molecules have been conducted on the Ru(0001) surface. 8 " 10 The major technical challenge in negative-ion ESDI-AD is to separate the large secondary electron signal from the much weaker (by approximately 10 ~4) negative-ion signal.…”

mentioning

confidence: 99%

“…The dissociative attachment process is expected to have a resonance at -2.2 eV, while dipolar dissociation should have a higher energy threshold (at ~~12 eV). 7 The threshold measurements needed to distinguish between these mechanisms are currently under way.…”

mentioning

confidence: 99%

Electron-Stimulated-Desorption Ion Angular Distributions of Negative Ions

1988

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We report the first measurements of the electron-stimulated-desorption ion-angular-distributions of negative ions from surfaces. The angular distributions of F ~ ions for electron-stimulated desorption of PF3, NF3, and (CF3>2CO on Ru(0001) depend on the molecular geometry and the state of the adsorbed species. The structural information obtained from these negative-ion studies complements that from similar positive-ion studies.

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“…Here, the configurations (P1s) 2 (F1s) 6 (P2s) 2 (P2p) 6 and (5a 1 ) 2 (3e) 4 represent the inner shells and inner valence shells, whereas (6a 1 ) 2 (4e) 4 (7a 1 ) 2 (5e) 4 (1a 2 ) 2 (6e) 4 (8a 1 ) 2 and (7e) 0 (9a 1 ) 0 (10a 1 ) 0 correspond to the outer valence shells of the ground electronic state and the virtual excited state orbitals, respectively. 6 Figure 2 shows a typical experimental EEL spectrum of PF 3 recorded at 100 eV impact energy and 2.9 • scattering angle with ∼40 meV (full width at half maximum) energy resolution.…”

Section: Electron Energy Loss Spectrummentioning

confidence: 99%

“…1). As mentioned therein, prior experimental studies were restricted to the formation of positive and negative ions, [2][3][4] total cross section (TCS) measurements, 5 and absolute photoabsorption oscillator strength determinations for valence and inner shells. 6 From the practical point of view, most of the electron-impact excitation cross section data needed for modeling plasma processes are still not available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Absolute cross section measurements for the scattering of low- and intermediate-energy electrons from PF3. II. Inelastic scattering of vibrational and electronic excitations

Hishiyama

Hoshino

Blanco

et al. 2018

The Journal of Chemical Physics

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As a sequel paper to our study of the elastic scattering for electron collisions with phosphorus trifluoride, PF molecules, we report absolute inelastic differential and integral cross sections (DCS and ICS) of vibrational excitations for the compound fundamental vibrational modes v (v + v), v (v + v), and their sum in the impact energy range of 2.0-10 eV and over a scattering angle range of 20°-130°. The measured angular distributions of scattered electron intensities for the present inelastic scattering are normalized to the elastic peak intensity corresponding to the DCSs of He. These vibrational excitation measurements demonstrate the presence of resonances around 2 eV and also around 6-10 eV. In addition, a generalized oscillator strength analysis is applied to derive oscillator strength f-values and (unscaled Born) ICSs from the corresponding DCSs measured for the low-lying optically allowed 8a → 7e (σ*) excitation band, which is assigned as the Jahn-Teller splitting and 8a → 4s Rydberg transition at impact energies of 100, 200, and 300 eV, over a scattering angle range of 1.0°-15°. The f-values obtained in the present study are compared with the results of previous photoabsorption and pseudo-optical measurements. The unscaled Born ICSs are compared with the binary-encounter f-scaled Born ICSs estimated over a wide impact energy region from the excitation thresholds.

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Energetics of the Ionization and Fragmentation of Phosphorus Trifluoride by Electron Impact

Cited by 18 publications

References 29 publications

Electron collisions with trifluorides: BF3 and PF3 molecules

Electron collisions with trifluorides: BF3 and PF3 molecules

Electron-Stimulated-Desorption Ion Angular Distributions of Negative Ions

Absolute cross section measurements for the scattering of low- and intermediate-energy electrons from PF3. II. Inelastic scattering of vibrational and electronic excitations

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