Zobrazeno 1 - 10
of 124
pro vyhledávání: '"Gordon H. Dunn"'
Autor:
F. Österdahl, A. Paál, Benjamin J. McCall, N Djuric, A. Al-Khalili, Mats Larsson, A. J. Huneycutt, O. Novotny, S. Kalhori, J. Semaniak, Richard D. Thomas, Anneli Ehlerding, Richard J. Saykally, A. Neau, Gordon H. Dunn, Fredrik Hellberg
Publikováno v:
Journal of Physics: Conference Series. 4:92-97
We present dissociative recombination measurements, using the CRYRING ion storage ring, of H3+ ions produced in a supersonic expansion discharge source. Before and after the CRYRING measurements, the ion source was characterized in Berkeley using inf
Autor:
G. Hinojosa, A. Aguilar, M. F. Gharaibeh, John D. Bozek, R. A. Phaneuf, Alfred Müller, Aaron Covington, Mark E. Bannister, Stefan Schippers, S. Ricz, Carmen Cisneros, Gordon H. Dunn, Alfred S. Schlachter
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 205:297-300
The principle of microscopic time-reversal of physical processes, detailed balance, is widely used and depended upon in the theoretical community as a connection between the inverse processes of photorecombination (PR) and photoionization (PI). This
Autor:
K.B. MacAdam, Håkan Danared, Stefan Schippers, W. Shi, S. Böhm, N Eklöw, Gordon H. Dunn, R. Schuch, N. Djurić, M. Fogel, Alfred Müller
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 205:370-373
Field-enhanced dielectronic recombination (DR) cross-sections differential in the main quantum number n have been measured for N4+ ions. The n-differential data were obtained at the heavy ion storage ring CRYRING by increasing the ion energy in two s
Autor:
A. M. Derkatch, H.F. Krause, Gordon H. Dunn, Young-Jin Chung, Mark E. Bannister, D. B. Popović, N. Djurić, Alan Smith, B. Wallbank
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 205:421-426
The JILA-ORNL merged electron–ion beam energy-loss apparatus has been used to measure absolute cross-sections for excitation of multiply-charged ions over the past several years. Recent measurements for the Na-like ions Al2+ and Cl6+ and the Mg-lik
Autor:
Mark E. Bannister, B. Wallbank, Y.-S. Chung, M. Stepanović, N. Djurić, Gordon H. Dunn, A. Neau, Alan Smith, D. B. Popović
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 34:L571-L577
The first absolute measurement of the cross section for excitation of a hydrogen-like ion is reported. The combined cross section for electron impact excitation of ground state He+ to the 2 2S and 2 2P excited states has been measured in the near-thr
Autor:
Y.-S. Chung, Alan Smith, Gordon H. Dunn, K.A Berrington, N. Djurić, B. Wallbank, Mark E. Bannister, O. Woitke
Publikováno v:
International Journal of Mass Spectrometry. 192:39-48
Absolute total cross sections for electron-impact excitation of the Be-like C2+, N3+, and O4+ ions have been measured near threshold using the merged electron-ion beams energy-loss (MEIBEL) technique and calculated using a close-coupling R-matrix (CC
Autor:
Chris H. Greene, Stefan Rosén, A. Al-Khalili, Gordon H. Dunn, L. Vikor, Mats Larsson, W. Zong, A. M. Derkatch, N. Djurić, W. Shi, M. af Ugglas, A. Neau, Håkan Danared, A. Le Padellec
Publikováno v:
Physical Review Letters. 83:951-954
Resonant ion pair formation from collisions of electrons with ground state diatomic molecular ions has been observed and absolute cross sections measured. The cross section for HD+ is characterized by an abrupt threshold at 1.9 eV and 14 resolved pea
Autor:
O. Woitke, N. Djurić, M. S. Pindzola, Gordon H. Dunn, Alan Smith, Mark E. Bannister, B. Wallbank, N. R. Badnell
Publikováno v:
Physical Review A. 58:4512-4517
Absolute cross sections for electron-impact excitation of the $2s{}^{2}\stackrel{\ensuremath{\rightarrow}}{S}2p{}^{2}P$ transition of ${\mathrm{B}}^{2+}$ measured between 5.4 and 7.0 eV are presented. The results are in good agreement with the R-matr
Autor:
Gordon H. Dunn, Stefan Rosén, Sheldon Datz, N. Djurić, Robert Peverall, A. Le Padellec, M. Larsson, Åsa Larson, Håkan Danared, Jacek Semaniak, C. Strömholm
Publikováno v:
The Astrophysical Journal. 505:459-465
The absolute cross section and branching ratios for dissociative recombination of CH -->+2 with electrons have been measured by means of the heavy-ion storage ring CRYRING. Contrary to what has been previously believed, recombination of CH -->+2 is d
Publikováno v:
Physical Review A. 58:304-308