Inner-Shell Vacancy Production in Ion-Atom Collisions

Garcia, J. D.; Fortner, R. J.; Kavanagh, Thomas M.

doi:10.1103/revmodphys.45.111

Cited by 643 publications

(106 citation statements)

References 139 publications

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“…Time integration of F weighted with the decay of the nuclear state yields an average rotation of 2.4 mrad for the high-velocity point. The probability of K-shell excitation [14] is less than 0.02% and may be neglected. Inclusion of (ls)2(2s)2(2p)-I ; 2P1/2 and (ls)2(2s)2(2p)6(3s)-I ; 2S1/2 configurations lead to an estimated total precession of 3.0 mrad.…”

Section: F(t) =mentioning

confidence: 99%

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Anomalously large transient field through polarized electron capture

et al. 1975

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The measured precession for 2aSi(2~) recoiling into magnetized Fe shows an anomalous increase with initial recoil velocity. This is explained quantitatively by capture of polarized Fe electrons into 2s vacancies in the moving ion.Transient magnetic fields have been used for the determination of g-factors of short-lived excited states of nuclei recoiling into ferromagnets [1][2][3]. In these measurements the magnitude of the transient field was estimated by adjusting the Lindhard and Wmther (LW) theory [4], which treats the scattering of (polarized) electrons by an ion on slowing-down in a polarized ferromagnet. For realistic screening and the known polarized electron velocity Up in the ferromagnet (but ignoring possible atomic effects) the theory yields fields, which are a factor of two lower than found experimentally [4], although the dependence on the charge Z of the nucleus on recoil into Fe is well reproduced.Most experiments involving the transient field were carried out at relatively low recoil velocities (o/c < 1.6%). The velocity dependence of the transient field in Fe has been tested in three experiments. For 196pt [5] and 103Rh [6] barely significant deviations from the adjusted LW theory were observed at a recoil velocity o/c = 1.8%. For 56Fe [7], however, large anomalies were found at o/c = 3% but the deviation was attributed to radiation damage effects.Several recent experiments [8, 9] on light nuclei (A = 18) at higher recoil velocities yielded integral precessions twice as large as expected from the adjusted LW theory (ALW) but the nuclear lifetimes were too long (3-7 ps) to exclude the possibility of (large) static hyperfme fields explaining the deviation.The possibility of an anomalous transient field was investigated in the present work for 28Si recoiling into polarized Fe at three initial velocities. The recoils were produced by inelastic proton and wparticle scattering at the bombarding energies shown in ta- The high-velocity point deviates by four standard deviations and by a factor of three from the LW curve. 329

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Section: F(t) =mentioning

confidence: 99%

“…The electron-loss cross section for the L-shell taken from Garcia et al [14], which is of the order of 10 9 b, is given ifl fig. 2.…”

Section: F(t) =mentioning

confidence: 99%

Anomalously large transient field through polarized electron capture

et al. 1975

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“…UVs [29]. The energy resolution of the CCD is experimentally measured and forms the basis for the binning analysis for the experimental results (sec.…”

Section: Ccd X-ray Spectrometer/ Energy Resolutionmentioning

confidence: 99%

Hot Electron Diagnostic in a Solid Laser Target by K-Shell Lines Measurement from Ultra-Intense Laser-Plasma Interactions R=1.06 (micron)m, 3x10 W/cm -2(less than or equal to) 500 J

Yasuike¹,

Wharton²,

Key³

et al. 2000

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Characterization of hot electron production (a conversion efficiency from laser energy into electrons) from ultra intense laser-solid target interaction by observing molybdenum (Mo) KP as well as K a emissions from a buried fluorescence tracer layer in the targets has been done. The experiments used 1.06 pm laser light with an intensity of from 2~1 0 '~ up to 3~1 0~' W cm-2 (20 -0.5 ps pulse width) and an on target laser energy of 280-500 J. The conversion efficiency from the laser energy into the energy, carried by hot electrons, has been estimated to be -50 % for the 0.5 ps shots at an on-target laser intensity of 3~1 0~' W cm-2, which increased from -30 % at lx1019 W cm-2 5 ps shots and -12 % at 2~1 0 '~ W cm-2 20 ps shots.

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“…Our model is only applicable to oxygen but we can assume that the pattern of energy deposition for precipitating oxygen and sulfur is very similar and apply the model to both species. We used the K shell excitation cross sections of Garcia et al (1973) and for the x-ray emission efficiencies of sulfur and oxygen, we used 10% and 0.8% respectively. The K-shell excitation cross sections are very small for ion energies less than 100 keV/amu, and they are proportional to q2 where q is the charge on the ion.…”

Section: K-shell X-ray Emission From Oxygen and Sulfurmentioning

confidence: 99%

The precipitation of energetic heavy ions into the upper atmosphere of Jupiter

Horányi¹,

Cravens²,

Waite³

1988

J. Geophys. Res.

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Evidence for auroral particle precipitation at Jupiter was provided by the ultraviolet spectrometers onboard the Voyagers 1 and 2 spacecraft and by the International Ultraviolet Explorer (IUE). Magnetospheric measurements made by instruments onboard the Voyager spacecraft indicate that energetic sulfur and oxygen ions are precipitating into the upper atmosphere of Jupiter. We have constructed a theoretical model describing the interaction of precipitating oxygen with the Jovian atmosphere. The auroral energy is deposited in the atmosphere by means of ionization, excitation, and dissociation and heating of the atmospheric gas. Energetic ion and electron precipitation are shown to have similar effects on the atmosphere and ionosphere of Jupiter.

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Inner-Shell Vacancy Production in Ion-Atom Collisions

Cited by 643 publications

References 139 publications

Anomalously large transient field through polarized electron capture

Anomalously large transient field through polarized electron capture

Hot Electron Diagnostic in a Solid Laser Target by K-Shell Lines Measurement from Ultra-Intense Laser-Plasma Interactions R=1.06 (micron)m, 3x10 W/cm -2(less than or equal to) 500 J

The precipitation of energetic heavy ions into the upper atmosphere of Jupiter

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