Scattering of electrons from hydride molecules: PH₃

Abstract

An absolute total cross section (TCS) for electron scattering from phosphine (PH 3 ) molecules was obtained in a linear transmission experiment at energies ranging from low (0.5 eV) to intermediate (370 eV). The dominant behaviour of the TCS energy function is a very pronounced low-energy enhancement with two distinct resonant-like humps peaked at around 2.4 and 6 eV. Above 10 eV the TCS is a rather featureless, monotonically decreasing function of energy. Our experimental results are compared with the theoretical predictions and intermediate-energy measurements. The similarities and differences of experimental TCS data for isoelectronic hydrides containing third-period atoms (SiH 4 , PH 3 , H 2 S and HCl) are also pointed out and discussed.

Calculation of electron-impact rotationally elastic total cross sections for NH3, H2S, and PHLimbachiya1, Vinodkumar2, Mason3 2011Phys. Rev. A353180View full textAdd to dashboardCite

“…There is a paucity of experimental data for this molecule, and the only experimental data are that of Szmytkowski et al [31]. A peak is observed in our data at 2.9 eV with a maximum value of cross section of around 48.0Å 2 , whereas the experimental data of Szmytkowski et al [31] show a peak at 2.4 eV, and the peak value is 48.3Å 2 , which is very close to present calculations. Experimental data show a strong second peak around 5 eV, but we see this as more of a shoulder in our calculated data.…”

“…Recently it has also been detected in the troposphere of giant planets [30]. Total cross sections for PH 3 have been measured by [31] using the linear transmission method, and calculations of electron-impact total cross sections have been reported by Jain and Baluja (10-5000 eV) [26], Munjal and Baluja (0.025-15 eV) [32], and Bettega et al (1-10 eV) [33].…”

“…Solid line (black), present TCS using Qmol; dash line (blue), present TCS using SCOP; stars, experimental results of Szmytkowski et al[31].…”

Electron scattering by trimethylene oxide, c-(CH2)3O, molecules

“…That implies that at higher energies the TCS for complex molecule may be estimated with a reasonable accuracy using the TCSs of its submolecular components and/or from the TCSs for simpler compounds ͑group additivity rule͒. This observation corresponds with earlier findings, 23,27,50 that for energies above 30-40 eV, where resonant effects become weak and can be neglected, the kind of target components and their count are more important in the electron-molecule scattering than the arrangement of the components in the molecule.…”

An approach to study electron and positron scattering from NH3 and PH3 using the analytic static potential

“…There are a few experiments carried out to obtain only TCS results for the electron scattering from NH 3 and PH 3 . Szmytkowski et al measured the TCS for NH 3 [27] in the energy range 1-100 eV and PH 3 [28] for energy 0.5-370 eV using linear transmission technique. With a similar technique, Zecca et al [29] reported the experimental results for electron-NH 3 scattering in the energy range 75-400 eV.…”