Browsing by Author "Church, David A."
Now showing items 1-20 of 34
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Palinkas, J.; Pedrazzini, G. J.; Church, David A.; Kenefick, R. A.; Fulton, C. A.; Watson, R. L.; Wang, D. W. (American Physical Society, 1985)
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Church, David A.; Kenefick, R. A.; Wang, D. W.; Watson, R. L. (American Physical Society, 1982)
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Church, David A.; Holzscheiter, H. M. (American Physical Society, 1989)
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Collinear Laser-Beam Ion-Beam Measurement of the Mean Lifetime of the Ar Ii 4p'2f-Degrees-7/2 Level Jin, J.; Church, David A. (American Physical Society, 1993)The mean lifetime tau of the 4p'F-2(7/2)-degrees level of Ar II has been measured using a variant of the collinear laser-beam-fast-ion-beam spectroscopy technique. Our variant requires no mechanical motion or laser frequency ...
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Church, David A.; Kravis, S. D.; Sellin, I. A.; Levin, J. C.; Short, R. T.; Meron, M.; Johnson, B. M.; Jones, K. W. (American Physical Society, 1987)
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Mishra, Chinmaya (Texas A&M University, 2005-11-01)The advancement in integrated circuit (IC) technology has resulted in scaling down of device sizes and supply voltages without proportionally scaling down the threshold voltage of the MOS transistor. This, coupled with the ...
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May, Jody C. (2010-10-12)A cryogenic (325-80 K) ion mobility-mass spectrometer was designed and constructed in order to improve the analytical figures-of-merit for the chemical analysis of small mass analytes using ion mobility-mass spectrometry. ...
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Dewitt, D. R.; Schneider, D.; Chen, M. H.; Schneider, M. B.; Church, David A.; Weinberg, G.; Sakurai, M. (American Physical Society, 1993)Measurements of relative dielectronic recombination (DR) cross sections for fluorinelike xenon (Xe45+) are presented. Recombination takes place in an electron-beam ion trap, where decay rates are obtained as the ions ...
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Dewitt, D. R.; Schneider, D.; Clark, M. W.; Chen, M. H.; Church, David A. (American Physical Society, 1991)Relative dielectronic-recombination cross sections for hydrogenlike argon are presented. The contributions of the KLL, KLM, KLN, KLO, and KLP groups of resonances are compared to theoretical calculations. The experimental ...
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Dunford, R. W.; Liu, C. J.; Last, J.; Berrahmansour, N.; Vondrasek, R.; Church, David A.; Curtis, L. J. (American Physical Society, 1991)We report a clear demonstration of the effect of hyperfine quenching of a forbidden transition by direct comparison of the lifetimes of the 2 3P0 level in the heliumlike isotopes Ni-61(26+) and Ni-58(26+). We find the ...
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Sampoll Ramirez, Gabriel (Texas A&M University. Libraries, 1992)Multielectron removal from an atom or molecule may be accomplished with high efficiency by the impact of a fast, highly-charged, heavy ion. When a diatomic molecule suffers the loss of electrons, it will generally dissociate ...
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Weinberg, G.; Beck, B. R.; Steiger, J.; Church, David A.; McDonald, J.; Schneider, D. (American Physical Society, 1998)Ions with charge states as high as 80+, produced in the Lawrence Livermore National Laboratory electron beam ion trap were extracted and transferred to a Penning ion trap (RETRAP). RETRAP was operated at cryogenic temperature ...
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Wang, H. Y.; Church, David A. (American Physical Society, 1987)
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Kravis, S. D.; Church, David A.; Johnson, B. M.; Meron, M.; Jones, K. W.; Levin, J. C.; Sellin, I. A.; Azuma, Y.; Berrahmansour, N.; Berry, H. G.; Druetta, M. (American Physical Society, 1992)The rate coefficients for electron transfer from Ar and H-2 to Ar(q+) ions (3 less-than-or-equal-to q less-than-or-equal-to 6) have been measured using an ion-storage technique in a Penning ion trap. The ions were produced ...
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Jin, J.; Church, David A. (American Physical Society, 1994)The mean lifetimes tau of the Ca II 4p P-2(1/2) and 4p P-2(3/2) levels, and the Cl-35 II 4p' F-1(3) level, have been measured by a variant of the collinear laser-ion-beam lifetime technique applied previously to the Ar II ...
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Demarest, John Allen (Texas A&M University. Libraries, 1986)A study of the extreme ultaviolet radiation emitted by ion beams of highly ionized neon and argon after passage through thin foils was conducted at the variable energy cyclotron at Texas A&M University. A grazing incidence ...
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Fu, Jun (Texas A&M University, 2004-11-15)A Finite Hilbert Basis Set (FHBS) method to calculate the angular and energy distribution of ejected electrons in an ion-atom collision is presented. This method has been applied to the p + H collision at 20 keV impact ...
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Maurer, Richard Jay (Texas A&M University. Libraries, 1988)A detailed study of ionization and fragmentation in molecular gas targets by 2.75 MeV H[+] and 40 MeV Ar[13+] ions has been performed using the time-of-flight (TOF) method. Ionization of molecular gases by 2.75 MeV H[+] ...
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Ryjkov, Vladimir Leonidovich (Texas A&M University, 2005-02-17)An investigation of the sympathetic cooling method for the studies of large ultra-cold molecular ions in a quadrupole ion trap has been conducted.Molecular dynamics simulations are performed to study the rf heating ...
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Wang, Qi (Texas A&M University. Libraries, 1994)Measurement of the mean lifetime of the $sp2$D metastable levels of Ca$sp+$ ions has been completed by detecting the spontaneous electric quadrupole (E2) transitions from the levels. A beam of calcium atoms effused from ...