Photoabsorption and photoionization of the valence and inner (P 2p, 2s) shells of PF3: Absolute oscillator strengths and dipole-induced breakdown pathways

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

“…2, the first double peak, in the 7.4-8.6 eV ∆E range fitted by two Gaussian functions, corresponds to the 8a 1 1 → 7e (σ * ) transition band, which is split due to the Jahn-Teller effect. 6 The next energy loss feature, from 8.6 to 10.3 eV, has been fitted by a single Gaussian function and represents the broad band with 24 vibrational progressions corresponding to the 8a 1 1 → 4s Rydberg and/or 9a 1 virtual valence excitations. Note that the present energy resolution (∼40 meV), together with statistical fluctuations, do not allow us to resolve the fine vibrational structure for this 4s/9a 1 transition.…”

“…Figure 2 shows a typical EEL spectrum at 100 eV and 2.9 • scattering angle. Figure 7 illustrates the generalized oscillator strengths (GOSs) as a function of momentum transfer squared for the 8a 1 1 → 7e (σ * ) and 8a 1 1 → 4s excitations, 6 together with the fitting curves of Vriens. 24 Experimental ICS and BEfscaled Born ICS, σ BEf , as well as plane Born ICS, σ Born , for these transitions are shown in Fig.…”

“…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. The first peaks in the EEL range from 7.4 to 8.6 eV have been assigned as the 8a 1 1 → 7e (σ * ), which presents band splitting due to the Jahn-Teller effect.…”

“…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. The lack of reliable inelastic cross section values prevents progress toward a more thorough understanding of the relevant phenomena.…”

“…Jahn-Teller splitting, and 8a 1 1 → 4s Rydberg transitions, 6 were measured at impact energies of 100, 200, and 300 eV for scattering angles ranging from 1.0 • to 15 • . From these results, along with a generalized oscillator strength (GOS) analysis, we derived the oscillator strength f 0 -values and the binary-encounter-f (BEf )-scaled ICSs 8 over a wide energy region, from the excitation threshold to 5000 eV.…”