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Showing 1 to 20 of 84 for “"Electron Impact"”.
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Electron-impact ionization of molecules
"Electron-impact ionization of molecules has been a fascinating and intriguing subject for decades. For high incident-electron energy ( ̃thousand eV), the collision dynamics has been well described by the plane wave impulse approximation (PWIA) for most molecules. For intermediate and low …
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Electron impact excitation-ionization of molecules
… few decades, the study of atomic collisions by electron-impact has made significant advances. The most difficult case to study is electron impact ionization of molecules for which many approximations have to be made and the validity of these approximations can only be checked by comparing with …
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Study of Electron-Impact Induced Fragmentation of Thymine
… fragmentation processes induced by low-energy electron impact. A molecular beam of thymine is generated by placing thymine in powder form inside a resistively heated oven. The beam of thymine is then crossed by a pulsed electron beam from an electron gun that consists of four electrostatic lens …
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Electron impact ionization cross sections for carbon vapor.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1970. Ph.D.
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The polarization of molecular line radiation following electron impact.
Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1980 .D377. Source: Masters Abstracts International, Volume: 40-07, page: . Thesis (M.Sc.)--University of Windsor (Canada), 1980.
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Electron impact excitation of 2p states in atomic hydrogen
… hydrogen through a collision with an unpolarised electron. The polarisation correlation variation of the delayed coincidence method has been employed to simultaneously measure the reduced Stokes parameters P1,P2 and P3, which are needed to fully characterise the state of the atom immediately after …
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Accuracy of theory for calculating electron impact ionization of molecules
<p>The study of electron impact single ionization of atoms and molecules has provided valuable information about fundamental collisions. The most detailed information is obtained from triple differential cross sections (TDCS) in which the energy and momentum of all three final state particles are …
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Theoretical calculations for electron impact ionization of atoms and molecules
… has been made for the theoretical treatment of electron impact ionization (e,2e) of atoms and molecules and, for some cases, very nice agreement between experiment and theory has been achieved. In particular, excellent agreement between theory and experiment and theory has been achieved for …
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Electron Impact Desorption of Ions and Neutrals From Polycrystalline Tungsten
Made available in DSpace on 2014-12-08T22:24:38Z (GMT). No. of bitstreams: 1 7000940.pdf: 5535805 bytes, checksum: d07206d654d974331ad0b4bc0f29390b (MD5) Previous issue date: 1969
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Computer Calculations of Cross Sections for Electron Impact Ionization of Helium
Triple differential cross sections for electron-impact ionization of helium are calculated in the distorted wave approximation. The distorted wave formalism is discussed for the z-axis parallel to the momentum transfer direction. Problems associated with programming this formalism are outlined. The …
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Theoretical study of direct and indirect single ionisation by electron impact /
… analyses the processes of single ionisation with electron impact using the distorted wave approximation. The work focuses on W5+, W25+, W26+, Fe3+ and Se3+ ions. The atomic data of these ions are important and have practical application perspectives for understanding and controlling astrophysical …
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Low-Energy Electron Impact Fragmentations of the Polycyclic Aromatic Hydrocarbon Anthracene
… fragmentation processes induced by low-energy electron impact with anthracene. This research is relevant in the study of low-energy electron interactions with molecules in gaseous environments, including potentially in the interstellar medium where secondary electrons may be produced by …
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Study of Low Energy Electron-Impact Induced Ionization and Fragmentation of Uracil
The aim of this experiment is to study low energy electron impact induced ionization and fragmentation of uracil. The apparatus consists of a pumped vacuum system with an expansion chamber, a collision chamber and a flight tube. A beam of uracil is generated in the expansion chamber, passes through …
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Determination of Electronic Energy Levels of Molecules by Low Energy Electron Impact Spectroscopy
Made available in DSpace on 2014-12-05T19:38:10Z (GMT). No. of bitstreams: 1 6303316.pdf: 3854120 bytes, checksum: de4d760c29ae8def02ce37ef17eafc87 (MD5) Previous issue date: 1962
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Development of an Apparatus for the Study of Electron Impact Fragmentation of Molecular Clusters
… at fragmentation processes induced by low-energy electron impact. These processes are studies by time-of-flight detection of ionised and neutral metastable fragments. A beam of molecular clusters is generated using a pulsed supersonic expansion, and this beam is crossed with a pulsed beam of …
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Miniaturized electron-impact-ionization pumps using double-gated isolated vertically aligned carbon nanotube arrays
… can be readily integrated with other MEMS and electronic components at the chip-scale level. Miniaturized ion pumps exhibit favorable scaling down because they are surface-limited and miniaturization increases the ratio between the active surface and the chamber volume, resulting in enhanced …
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