Výsledky vyhledávání - "R W, O'Neill"

Modification of the magnetic properties of exchange coupled NiFe/FeMn films by Ga+ ion irradiation

Autor: S. Blomeier, J. N. Chapman, Burkard Hillebrands, R W O'Neill, Jürgen Fassbender, Damien McGrouther, Stephen McVitie, M. C. Weber

Publikováno v: Journal of Magnetism and Magnetic Materials 290(2005)1, 731-734
JEMS'04, Dresden, 06.-10.09.2004

The influence of 30 keV Ga + ion irradiation on the magnetic properties of polycrystalline NiFe/FeMn exchange bias layers was investigated. In this context, it was of particular interest to determine whether a previously observed enhancement of the b

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4434513da7454c852e30d6ecb3f9a80d
https://doi.org/10.1016/j.jmmm.2004.11.278

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Observation of collective effects in the multiphoton ionization of atomic deuterium

Autor: F. Giammanco, J Slevin, R. W. O'neill, P J M van der Burgt, P. Bowe

Publikováno v: Physical Review A. 58:1389-1398

The yields and time-of-flight spectra for ions produced in three-photon ionization of atomic deuterium have been investigated as a function of laser intensity from 0.4 to 200 MW/cm2. A pulsed laser beam of 243 nm is used, so that the photoionization

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4bc91f8894474191185e7369d2dc9452
https://doi.org/10.1103/physreva.58.1389

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A technique for absolute measurements in near threshold excitation of positive ions: application to excitation of

Autor: Jason B. Greenwood, R W O'Neill, B. Srigengan, I. G. Hughes, Ian Williams

Publikováno v: Measurement Science and Technology. 9:930-938

An electron-ion crossed beams experiment has been developed in which the energy loss of scattered electrons is used to determine cross sections for excitation in positive ions. Scattered electrons are confined by an axial magnetic field and are chann

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c60f7617ad4aed70f861be7ac17a4a47
https://doi.org/10.1088/0957-0233/9/6/010

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Polarization Correlation Measurements of Electron Impact Excitation ofH(2p)at 54.4 eV

Autor: P. Bowe, R. W. O'neill, D. Dziczek, P J M van der Burgt, J Slevin, S Chwirot

Publikováno v: Physical Review Letters. 80:1630-1633

First direct measurements are reported of the linear reduced Stokes parameters P1,P2 for H(2p) excited by electron impact at the benchmark energy of 54.4 eV. The results differ significantly from previous values deduced from angular correlation measu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::67768cdfa0507e45087443a33880612a
https://doi.org/10.1103/physrevlett.80.1630

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Energy resolution of a planar trochoidal monochromator

Autor: I D Williams, R W O'Neill

Publikováno v: Measurement Science and Technology. 6:1133-1139

An expression is derived for the energy resolution of a planar trochoidal monochromator. The expression is generally valid for entrance and exit apertures (beams) of circular cross section, and obviates the previous practice of assigning to the resol

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7e9f90c83e44fc53f4867933964d2c54
https://doi.org/10.1088/0957-0233/6/8/007

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Low-energy elastic backscattering of electrons from Ar+

Autor: B. Srigengan, W R Newell, Jason B. Greenwood, Ian Williams, J Geddes, R W O'Neill

Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 28:L307-L311

Measurements of absolute partial cross sections, integrated over the angular range 90 degrees -180 degrees , are reported for the elastic scattering of electrons from Ar+ at impact energies 3.5-6.5 eV. These constitute the first measurements of backw

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::680f11a0cdf9a572d09c52c09c13c224
https://doi.org/10.1088/0953-4075/28/9/003

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Elastic scattering of electrons from ions

Autor: W.R. Newell, Ian Williams, J Geddes, B. Srigengan, Jason B. Greenwood, R W O'Neill

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 98:125-128

First experimental results are reported for high angle elastic scattering of electrons from an ion at collision energies below the inelastic threshold. Absolute partial cross sections have been measured for the angular range π 2−π for Ar+ over th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::982e8d1319184598cb09e4ba18a92e43
https://doi.org/10.1016/0168-583x(95)00087-9

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