Angular distribution of X-radiation following electron bombardment of free atoms

Aydinol, M.; Hippler, R.; McGregor, Ian A.; Kleinpoppen, Hans

doi:10.1088/0022-3700/13/5/024

Cited by 31 publications

(17 citation statements)

References 24 publications

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“…The results of experiments involving the angular distribution of bremsstrahlung emitted by electrons incident on free Ar, Kr, and Xe atoms performed by Aydinol et al [2] support the theoretical work of Tseng et al [5] and KQP [6].…”

Section: Introductionsupporting

confidence: 75%

“…Also, it would be interesting to perform experiments involving free-atom targets (such as those performed by Aydinol et al [2]) in order to study the angular distribution of polarizational bremsstrahlung [19], which has not been observed in solid-target experiments [12].…”

Section: Discussionmentioning

confidence: 99%

“…While there have been a few experimental studies [1][2][3][4] related to the angular distribution of bremsstrahlung emitted by electrons, there is still a need for additional experimental data to compare with theoretical treatments [5,6] and Monte Carlo simulations [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Angular distribution of thick-target bremsstrahlung produced by electrons with initial energies ranging from 10 to 20 keV incident on Ag

2011

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Experimental results are presented comparing the intensity of the bremsstrahlung produced by electrons with initial energies ranging from 10 to 20-keV incident on a thick Ag target, measured at forward angles in the range 0˚ to 55˚. When the data are corrected for attenuation due to photon absorption within the target, the results indicate that the detected radiation is distributed anisotropically only at photon energies, k, that are approximately equal to the initial energy of the incident electrons, E o . The results of our experiments suggest that as k /E o → 0, the detected radiation becomes essentially isotropic due primarily to the scattering of electrons within the target. A comparison to the theoretical work of Kissel et al. [6] suggests that the angular distribution of bremsstrahlung emitted by electrons incident on thick targets is similar to the angular distribution of bremsstrahlung emitted by electrons incident on free-atom targets only when k /E o ≈1. The experimental data are also in approximate agreement with the angular distribution predictions of the Monte Carlo program, PENELOPE.

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Section: Introductionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

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Angular distribution of thick-target bremsstrahlung produced by electrons with initial energies ranging from 10 to 20 keV incident on Ag

2011

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“…On the other hand, it is still an open question how strongly the postcoltision interaction affects the angular distribution of Auger electrons especially near and at threshold. In this connection it is interesting to note the large negative alignment d2o=-0.9 (3) in the case of Xe 2p3/z ionisation [24] which has been measured without PCI via the anisotropic intensity of X-radiation but for an impact energy of 1220 eV above threshold. Further alignment measurements for this system and for smaller impact energies seem highly desirable.…”

Section: Discussionmentioning

confidence: 92%

“…In this connection it is worthwhile to recollected those alignment values which have been measured via radiative decay and as much as possible near threshold. The only relevant measurement is that by Aydinol et al [24]. They determined ~20 for Xe 2p3/2 ionisation via the anisotropic intensity of X-radiation to be -0.9 (3) for an excess energy El=1220eV and E(2p3/2) = 4780 eV.…”

Section: Resultsmentioning

confidence: 99%

Alignment of Ar+ (2p −1 2 P 3/2) ions after electron impact ionisation in the range 1 keV to 268 eV

Weber

Huster

Kamm

et al. 1991

Z Phys D - Atoms, Molecules and Clusters

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Abstract.We have measured the alignment sJ20 of Ar + (2p-~ 2P3/z) ions after electron impact ionization in the range of primary electron energy E0 = 1000... 268 eV (range of excess energy E I = 750... 19.5 eV) via the anisotropic angular distribution of 3 M2,3 (ISo) Auger electrons. On decomposing the Auger spectra into their components special care was taken by including the effect of the postcollision interaction on the shape of Auger lines. The present alignment values for E o > 350 eV agree well with previously existing experimental values of DuBois and Rodbro and with theoretical DWBA results of Berezkho and Kabachnik, but for Eo < 350 eV they deviate systematically from the DWBA values. For the lowest impact energy Eo, which is only 19.5 eV above threshold, we obtained ~2o= +0.09(i6). This value clearly indicates that in the ionisation process near threshold the two low-energy electrons escape not only with a two-electron partial wave L=0, according to Wannier's original assumption, but also with partial waves L > 0.

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A “Laudatio” for Professor Hans Kleinpoppen

Williams

Hippler

Complete Scattering Experiments

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Angular distribution of X-radiation following electron bombardment of free atoms

Cited by 31 publications

References 24 publications

Angular distribution of thick-target bremsstrahlung produced by electrons with initial energies ranging from 10 to 20 keV incident on Ag

Angular distribution of thick-target bremsstrahlung produced by electrons with initial energies ranging from 10 to 20 keV incident on Ag

Alignment of Ar+ (2p −1 2 P 3/2) ions after electron impact ionisation in the range 1 keV to 268 eV

A “Laudatio” for Professor Hans Kleinpoppen

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