Bulletin of the American Physical Society
72nd Annual Gaseous Electronics Conference
Volume 64, Number 10
Monday–Friday, October 28–November 1 2019; College Station, Texas
Session NR1: Electron Molecule Collisions and Related Topics |
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Chair: Sylwia Ptasinska, University of Notre Dame Room: Century I |
Thursday, October 31, 2019 8:00AM - 8:30AM |
NR1.00001: Electron Collisions with Dielectric Gases Considered as a SF$_6$ Replacement Invited Speaker: Juraj Fedor SF$_6$ is widely used as an insulator in high-voltage circuits and switchgear due to its excellent dielectric properties. However, it has an extremely high global warming potential. There is thus an intensive search for a suitable replacement, which has to be a strongly electron-attaching gas and, additionally, it has to fulfill several other criteria. We experimentally probe the electron collision processes with such candidate gases under single collision conditions. We focus on three elementary channels: (i) electron attachment, (ii) electron impact ionization and (iii) elastic and inelastic electron scattering. All channels are characterized quantitatively, that is, the absolute cross sections are measured using three different electron-molecule collision setups. Apart from providing the cross sections, we focus on the dynamics of atomic nuclei during the scattering, especially in the bond-breaking channels (dissociative ionization and dissociative electron attachment). [Preview Abstract] |
Thursday, October 31, 2019 8:30AM - 8:45AM |
NR1.00002: Low Energy Elastic Electron Scattering from Dimethyl Ether and Diethyl Ether Gillian Tatreau, Borna Hlousek, Mateausz Zawadzki, Murtadha A Khakoo Experimental differential cross sections for electron scattering from two ethers - gaseous (CH$_{\mathrm{3}})_{\mathrm{2}}$O and (C$_{\mathrm{2}}$H$_{\mathrm{5}})_{\mathrm{2}}$O - are presented. The measurements are taken with a high resolution electron spectrometer and use the relative flow method with a moveable (aperture) target gas delivery source [1] which obviates the need to know gas kinetic cross sections for the target molecule. Helium gas was used as standard, with established cross sections from [2,3]. The moveable source enables accurate determinations of background scattering [1] and the measurements are taken at incident electron energies of 1 eV to 30 eV for scattering angles of 10$^{\mathrm{o}}$ to 130$^{\mathrm{o}}$. Comparisons with existing cross sections are made. [1] M. A. Khakoo \textit{et al}., J. Phys.B. \textbf{40}, 3601 (2007). [2] R. K. Nesbet, Phys. Rev. A \textbf{20}, 58 (1979). [3] D. F. Register et al. Phys. Rev. A \textbf{21}, 1134 (1980). [Preview Abstract] |
Thursday, October 31, 2019 8:45AM - 9:00AM |
NR1.00003: Under the Barrier Wave Packet Tunneling Dynamics Allison Harris, Torrey Saxton, Glenn Dusing Recent experimental work has succeeded in producing electron wave packets with non-traditional spatial profiles. These include wave packets in the shape of an Airy function, which are minimally dispersive, exhibit force-free acceleration, and can self-heal. Optical Airy beams have been studied since their discovery in the late 1970s and have found numerous applications in technologies such as microscopy and optical trapping. However, the dynamics of matter Airy beams is not fully understood. An interesting feature of the Airy wave packet is that its momentum density, like that of a Gaussian wave packet, is Gaussian. This provides an opportunity to compare the dynamics of wave packets with the same momentum density, but different spatial profiles. We use our Path Integral Quantum Trajectory (PIQTr) model to present a time-dependent theoretical study of tunneling, reflection, and transmission of Airy wave packets. We show that the dynamics of tunneling for the two types of wave packets is significantly different. In particular, the tunneling of the Airy beam is delayed compared to the Gaussian wave packet, and the probability density under the barrier during tunneling exhibits different dynamics [Preview Abstract] |
Thursday, October 31, 2019 9:00AM - 9:15AM |
NR1.00004: Low Energy Elastic Electron Scattering from Benzonitrile - C$_{\mathrm{6}}$H$_{\mathrm{5}}$CN M Zawadzki, G Tatreau, B Diaz, B Hlousek, M. A. Khakoo Experimental differential cross sections for electron scattering from gaseous C$_{\mathrm{6}}$H$_{\mathrm{5}}$CN are presented. The measurements were taken with a high resolution electron spectrometer and used the relative flow method with a moveable (aperture) target gas delivery source [1]. Helium gas was used as standard, with established cross sections from [2,3]. The moveable source enabled accurate determinations of background scattering [1] and the measurements were taken at incident electron energies of 1 eV to 30 eV for scattering angles of 10$^{\mathrm{o}}$ to 130$^{\mathrm{o}}$. Comparisons to existing cross sections will be made. [1] M. A. Khakoo \textit{et al}., J. Phys.B. \textbf{40}, 3601 (2007). [2] R. K. Nesbet, Phys. Rev. A \textbf{20}, 58 (1979). [3] D. F. Register et al. Phys. Rev. A \textbf{21}, 1134 (1980). [Preview Abstract] |
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