Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Donald S. Gemmell"'
Autor:
Donald S. Gemmell, Elliot P. Kanter, Th. Weber, Horst Schmidt-Böcking, S. Hasegawa, Bertold Krässig, W. Schmitt, Linda Young, Stephen H. Southworth, R. W. Dunford
Publikováno v:
Physical Review Letters. 83:53-56
There exist substantial discrepancies between theoretical predictions for the cross section of double ionization in helium by Compton scattering. Consistency between different approaches has been reached for the high-energy asymptotic value of the do
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ab679e73024313cd3a96571e03edc12
https://doi.org/10.1103/physrevlett.83.53
https://doi.org/10.1103/physrevlett.83.53
Autor:
J. P. J. Carney, Stephen H. Southworth, M. Jung, R. H. Pratt, T. LeBrun, L. Lajohn, Bertold Krässig, Donald S. Gemmell, Elliot P. Kanter, P. M. Bergstrom, R. W. Dunford, Linda Young
Publikováno v:
Physical Review Letters. 81:1596-1599
We report precise measurements of differential x-ray scattering cross sections in Ne and He from 11{endash}22thinspthinspkeV and develop a method for obtaining predictions of comparable accuracy (1{percent} ). The measurement of ratios (total scatter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0c11de013325dbcb994c816b005d29a0
https://doi.org/10.1103/physrevlett.81.1596
https://doi.org/10.1103/physrevlett.81.1596
Autor:
Donald S. Gemmell, A. E. Livingston, Elliot P. Kanter, Song Cheng, M. Jung, Lorenzo J. Curtis, H. G. Berry, R. W. Dunford
Publikováno v:
Physical Review Letters. 79:3359-3362
k is the direction of observation. The anisotropy arises from interference between the M1 and induced E1 amplitudes for the decay. Theory predicts that the pseudo-T-odd invariant should contribute to the angular distribution through a term associated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d480f7b1e50a9c9eac0afead825f78a
https://doi.org/10.1103/physrevlett.79.3359
https://doi.org/10.1103/physrevlett.79.3359
Autor:
Tim Graber, Donald S. Gemmell, M. P. Carpenter, R. W. Dunford, Jerry Nolen, R. V. F. Janssens, Elliot P. Kanter, Z. Vager
Publikováno v:
Physical Review A. 55:2090-2096
The Coulomb explosion of 173-MeV HeH{sup +} molecular ions traversing thin carbon foils has been measured for foil thicknesses ranging from 2 to 200{mu}g/cm{sup 2}. In contrast with measurements at lower energies, the energy spectra for protons obser
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::080740c2c3a0aa37999706658fc98778
https://doi.org/10.1103/physreva.55.2090
https://doi.org/10.1103/physreva.55.2090
Autor:
R. W. Dunford, Song Cheng, H. G. Berry, Lorenzo J. Curtis, Rami Ali, Elliot P. Kanter, I. Ahmad, A. E. Livingston, Donald S. Gemmell, P. H. Mokler, M. Jung
Publikováno v:
Physical Review A. 55:994-1006
We report a measurement of the spectral distribution of photons from the two-photon decay of the ${1\mathrm{s}2\mathrm{s}}^{1}$${\mathrm{S}}_{0}$ level in heliumlike krypton. In the experiment, a beam of ${\mathrm{Kr}}^{34+}$ ions was excited using a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc9a7205956ff22d1b154594c84a2f68
https://doi.org/10.1103/physreva.55.994
https://doi.org/10.1103/physreva.55.994
Autor:
Donald S. Gemmell, H M Reichenbach, Rami Ali, Linda Young, Elliot P. Kanter, T. LeBrun, H. G. Berry, R. W. Dunford
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 29:5607-5617
We have measured the spectrum of vacuum ultraviolet radiation (500 - 1700 A) arising from the impact of 625 MeV xenon ions with . The spectral features are due primarily to emission from neutral and ionized carbon atoms. These photons mask sensitivit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d1a559f363828ebab3e68ab7f090b225
https://doi.org/10.1088/0953-4075/29/22/031
https://doi.org/10.1088/0953-4075/29/22/031
Autor:
R. W. Dunford, Song Cheng, T. LeBrun, H. G. Berry, Wolfgang Bauer, Elliot P. Kanter, Donald S. Gemmell, H. Esbensen
Publikováno v:
Physical Review A. 54:3182-3194
${\mathrm{C}}_{60}$ vapor was bombarded by $^{136}\mathrm{Xe}^{35+}$ and $^{136}\mathrm{Xe}^{18+}$ ions in the energy range 420--625 MeV to study the various ionization and fragmentation processes that occur. Since the center-of-mass energies used in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1de50cfac0c83ac5943ae03df10dfd89
https://doi.org/10.1103/physreva.54.3182
https://doi.org/10.1103/physreva.54.3182
Autor:
M. Jung, T. LeBrun, Stephen H. Southworth, Elliot P. Kanter, Donald S. Gemmell, Bertold Krässig, Linda Young
Publikováno v:
Physical Review Letters. 75:4736-4739
We have measured the nondipolar contribution to the Ar 1{ital s} photoelectron angular distribution over the 30{endash}2000 eV electron-energy range. The nondipolar interaction results in a forward or backward asymmetry with respect to the photon bea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a673872b9bc18f4f69864cb161a0231
https://doi.org/10.1103/physrevlett.75.4736
https://doi.org/10.1103/physrevlett.75.4736
Autor:
R. W. Dunford, H. G. Berry, Song Cheng, Jamal Suleiman, A. E. Livingston, K. W. Kukla, Lorenzo J. Curtis, Elliot P. Kanter, Donald S. Gemmell
Publikováno v:
Physical Review A. 51:1905-1917
We have measured the 1s2s $^{3}$${\mathit{S}}_{1}$--1s2p $^{3}$${\mathit{P}}_{0}$ and 1s2s $^{3}$${\mathit{S}}_{1}$--1s2p $^{3}$${\mathit{P}}_{2}$ fine-structure transition wavelengths in the heliumlike ${\mathrm{Ar}}^{16+}$ ion using the beam-foil s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::79adecfd4d22413f3a45126a8c6c1900
https://doi.org/10.1103/physreva.51.1905
https://doi.org/10.1103/physreva.51.1905
Autor:
M. Westerlind, J. P. Kirkland, Jamal Suleiman, Donald S. Gemmell, Joseph C. Woicik, Y. Azuma, Ivan A. Sellin, H. G. Berry
Publikováno v:
Physical Review A. 51:447-453
Using X-ray photons at the X24A, X23B and X23A2 beam lines at NSLS, we measured the total photo-attenuation cross section of helium for photons in the energy range of 3 to 14 keV. In this range the photoionization cross section decreases rapidly with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f67ca52a20bfd705fc4a30a4866c473
https://doi.org/10.1103/physreva.51.447
https://doi.org/10.1103/physreva.51.447