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Showing 1 to 20 of 32 for “"Field ionization"”.

  1. Field ionization from carbon nanofibers

    Adeoti, Bosun JMassachusetts Institute of Technology2008

    … and real-time gas sensors. We developed a field ionizer array based on gated CNTs. Arrays of CNTs are used because of their small tip radii and high aspect ratio which yields high electric fields at low voltages. One possible configuration for the device is to bias the CNTs at the highest …

    mit Repository record

  2. Nanowire sharpening : application to field ionization

    Leviyev, Alex2021

    Nanowires show potential for a wide range of fields, from developing next generation solar cells, to detecting viruses, to field ionizing gasses. Their uses in such disparate fields are due to the extreme flexibility in which nanowires can be manufactured and customized to order. The heart of a …

    tdl Repository record

  3. Strong Optical Field Ionization of Solids

    Ben Taher, AzzaUniversité d'Ottawa / University of Ottawa2018

    … band in the presence of an intense laser field is explored theoretically in semiconductors and dielectrics. Experiments on intense laser driven dielectrics have revealed population transfer to the conduction band that differs from that seen in semiconductors. Our research explores two …

    ottawa-retro Repository record

  4. Carbon nanotube-based field ionization vacuum

    Jang, Daniel, M. Eng. Massachusetts Institute of TechnologyMassachusetts Institute of Technology2012

    … of isolated vertical carbon nanotubes (CNT) to field ionize gas particles. The ionized gas molecules are accelerated to and implanted into a negatively biased getter removing the gas molecules from the volume being pumped. CNTs are ideal for field ionization because of their nano-sized diameter, …

    mit Repository record

  5. ELECTRIC FIELD IONIZATION OF SODIUM RYDBERG ATOMS

    JEYS, THOMAS HENRYRice University1982

    … the atomic core that a relatively small electric field may cause the electron to be stripped from the atom. The field strength at which this ionization happens is strongly dependent on the state of the Rydberg atom. Pulsed electric field ionization serves, therefore, not only as a means by which a …

    rice Repository record

  6. Strong Field Ionization Of Radicals And Reaction Intermediates

    Cudry, Fadia2015

    … The calculated Isats correlate closely with the ionization potential which will help identify the different isomers. This study was then extended to several precursors relevant to combustion. The flash pyrolysis spectra are also presented. The calculated Isats for the heptane and isomers products …

    wayne-thes Repository record

  7. Fundamental Studies And Applications Of Strong Field Ionization

    Yan, Lu2013

    <p>In an intense laser field, atoms and molecules experience tunneling ionization directly to the continuum. We used this method to study several aspects and applications of strong field ionization (SFI) in atoms and molecules. One study used SFI to probe the photofragments produced by …

    wayne-thes Repository record

  8. Double-gated isolated vertically aligned carbon nanofiber field emission and field ionization arrays

    Chen, Liang-Yu, 1979-Massachusetts Institute of Technology2007

    Electron impact ionization (ElI) is used extensively in mass spectrometry for gas-phase analytes. Due to the significant amount of fragmentation generated by ElI, the spectrum is usually very noisy. In addition, the thermionic emission electron source used in ElI has a slow response time and …

    mit Repository record

  9. A study of optical properties and current emission processes of gas phase field ionization sources

    Liu, Xuefeng2004

    Field emission ion sources are extremely important for producing high-resolution ion beams essential for several fields of research and especially for semiconductor manufacturing. Although most sources used are based on liquid metals they cannot produce beams of H, He or other noble gases, so that …

    maryland Repository record

  10. Topics in the Theory of Condensed Matter: Electron Field Emission, Field Ionization, and Ethane Catalysis

    Fauchier, Jess F., IIUniversity of Illinois at Urbana-Champaign2015

    Made available in DSpace on 2015-05-12T22:39:08Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7500302.PDF: 4292200 bytes, checksum: f477d32bb9e709b3f24d57bdd081d147 (MD5) Previous issue date: 1974

    uiuc Repository record

  11. Topics in the Theory of Condensed Matter: Electron Field Emission, Field Ionization, and Ethane Catalysis

    Fauchier, Jess F., II2012

    Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-01-11T19:04:18Z No. of bitstreams: 1 1974_fauchier.pdf: 4688942 bytes, checksum: 02db929e93e9eb7d5d635803a11519c6 (MD5)

    uiuc Repository record

  12. Developing A Toolbox To Probe Reaction Dynamics With Strong Field Ionization And Non-Linear Attosecond Spectroscopy

    Herath, Thushani Nikeshala2015

    … related to the laser matter interaction: strong field ionization and nonlinear attosecond spectroscopy. The first part is based on the studies related to the strong field ionization probe. Strong field ionization probe was verified to be sensitive to the sign of magnetic quantum number which …

    wayne-thes Repository record

  13. Ionization of Rydberg Atoms at Patterned Electrode Arrays

    Pu, YuRice University2013

    … work explores the effect of controlled surface fields on the ionization of Rydberg atoms near surfaces. Lithographically-patterned micrometer scale electrode arrays are used to generate controlled surface electric fields. The data show that application of even small electrode biases (~±1V) can …

    rice Repository record

  14. Particle modeling of non-equilibrium field emission driven RF microplasmas

    Tholeti, Siva Sashank

    … are on the order of kilovolts. When the electric field at the electrodes reaches GV/m or tens of GV/m either due to reduced interelectrode spacing and surface irregularities or due to carefully designed nanostructures on the electrodes, quantum processes such as field emission and field ionization …

    purdue-thes Repository record

  15. The atom field ion microscope: Fundamental principles of operation

    Chambers, Robert Sloane2011

    … are the following capabilities! probe-hole field emission measurements of the work function allowing an independent means for chemical characterization of the surface, automatic temperature measurement and control of the sample down to ~ 200 K, and optical alignment of the sample with the …

    uiuc Repository record

  16. Numerische Simulationen zur Einfach- und Doppelionisation von H2 in kurzen intensiven Laserpulsen

    Baier, SilvioUniversität Bielefeld

    … is the dominant process leading to double ionization in atoms and molecules interacting with linearly polarized laser pulses with wavelengths around 800 nm and in an intensity regime of 10^14 to 10^15 W/cm². Using numerical integrations of the two-electron Schrödinger equation of the …

    bielefeld Repository record

  17. Photoionization of excited states of atomic hydrogen in a strong electric field

    Glab, Wallace Lee2011

    The photoionization of excited states of atomic hydrogen in a strong external electric field is examined theoretically and experimentally. A theoretical treatment which predicts novel effects in the excitation of the broad resonant states in the continuum from pure parabolic Stark states is …

    uiuc Repository record

  18. Resonant Dipole-Dipole Energy Transfer Dynamics in a Frozen Rydberg Gas

    Fahey, Donald P.2014

    … the 32d<sub>5/2</sub> state in a weak electric field. The magnitude of the field sets the energy level spacing between these states, and hence the frequency of the phase dependent oscillations resulting from interference in resonant energy exchange processes. In the third experiment, the …

    bryn-mawr Repository record

  19. Spectroscopy of even-parity states of molecular hydrogen

    Bistransin, Mark WilliamTexas Tech University1993

    … of molecular hydrogen is examined by Resonance Ionization Spectroscopy-Time Of Flight (RIS-TOF} spectroscopy. This is the first time that the autoionization and predissociation yields of individual s and d Rydberg states are detected separately. This is accomplished by first exciting the …

    ttu Repository record

  20. Feasibility of analysis of polar compounds by high performance liquid chromatography with Fourier transform infrared spectroscopic detection

    Amateis, Patricia G.Virginia Tech1984

    … concerning the samples were provided by field ionization mass spectrometry, gas chromatography/ mass spectrometry and reversed phase liquid chromatography employing UV detection. An equation relating reversed phase retention times to structural parameters was developed and applied to the …

    vt Repository record

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