Radiative electron capture by fully stripped channeled light ions

Tribedi, Lokesh C.; Nanal, V.; Press, M. R.; Kurup, M.B.; Prasad, K. Krishna; Tandon, P.N.

doi:10.1103/physreva.49.374

Cited by 18 publications

(8 citation statements)

References 27 publications

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“…However, good agreement with the ion-atom model (ECPSSR) may indicate that the influence, for the present collision systems, is negligibly small. This observation is consistent with our earlier investigations on radiative electron capture in ion-solid collisions using carbon ions with similar energies [25,26]. It was shown that, for the case of heavy ions channelled in a Si single crystal, the radiative electron capture (REC) x-ray cross sections as well as the photon energies were about the same as those found in collisions with gaseous targets [45] for Z p 9.…”

Section: 31supporting

confidence: 91%

“…Additional complications arise if the collision system involves a solid target. In such collision systems the solid-state effect, which arises from the large electron density fluctuation and plasmon excitation, is known to influence the atomic collision processes, as evident from many experimental results in the past [24][25][26][27][28][29][30][31]. Most of the studies on atomic collisions with solids are related to the interaction of the ion with the free electron gas (FEG).…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of K-shell ionization of low-Zsolids in collisions with intermediate-velocity carbon ions and the local plasma approximation

Kadhane

Montanari

Tribedi

2003

J. Phys. B: At. Mol. Opt. Phys.

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K-shell vacancy production in low-atomic-number (Zt = 17–29) solid targets has been measured in collisions of highly charged carbon ions with energies of 1.5–6 MeV u−1. The K-shell ionization cross sections of Cl, K, Ti, Fe and Cu are derived from the measured K x-ray cross sections. The present data-set has been used to test the predictions of a theoretical model based on the local plasma approximation (LPA). This theory takes into account the response of solid core electrons working within the dielectric formalism. We find that this ab initio ion–solid model gives very good agreement with the measured data for Fe and Cu targets, while it tends to under-estimate the data for the most symmetric collision systems studied here. We discuss the range of validity of the LPA in terms of the symmetry parameter and the impact velocity. On the other hand, a model based on the perturbed stationary state approximation, designed for ion–atom collisions (ECPSSR) is found to give excellent agreement with the measured data for all target elements over the whole energy range. All the measured cross sections for different targets are found to follow a universal scaling rule predicted by the ECPSSR.

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Section: 31supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Experimental study of K-shell ionization of low-Zsolids in collisions with intermediate-velocity carbon ions and the local plasma approximation

Kadhane

Montanari

Tribedi

2003

J. Phys. B: At. Mol. Opt. Phys.

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“…Other than that, inner shell processes play an important role in the ionization processes of these large systems. There are plenty of studies on inner shell ionization using x-ray techniques [30,31], or on inner shell electron capture [32,33] and the Auger channel, which confirm the fact.…”

Section: Introductionmentioning

confidence: 85%

Differential electron emission in the ionization of Ne and Xe atoms under fast bare carbon ion impact

Biswas

Monti

Tachino

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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Measurement of the energy and angular distributions of the double differential cross section (DDCS) of electron emission from Ne and Xe atoms in collision with 5 MeV u −1 bare carbon ions is reported. This study aimed to investigate the electron emission processes in the case of multi-electronic systems. In general, several clear differences between the electron emission spectra of Ne and Xe are found, which indicate the influence of the increasing number of electrons. For instance, the sharp peak due to the binary nature of collision is almost absent in the case of Xe, unlike Ne, which could be understood due to the increasing contribution from the strongly bound inner shell (such as d 4 ) electrons for the Xe atom. The forward-backward angular asymmetry has also been derived from the angular distributions. For Xe, the qualitative behaviour of the asymmetry parameter is seen to be quite different since it reveals structures due to Auger contributions. It is, in general, different and much lower than that for Ne, which shows the smooth behaviour that one finds for other lighter atoms like He. The single differential and total cross sections are also derived. The theoretical calculations based on the prior form of the continuum distorted wave-eikonal initial state (CDW-EIS) approximation have been provided for both the targets. Overall, it gives a very good agreement with the energy and the angular distributions of DDCS for Ne. For Xe, the agreement is not as good as for Ne. We also provide a detailed discussion on the DDCS obtained from different sub-shell ionization, estimated in this framework.

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“…This collective behavior of electrons in solids is known to give rise to dynamic screening and a wake of electron-density fluctuations [18,19]. The influence of the solid-state effect on different collision processes, such as radiative electron capture [20][21][22], resonant coherent excitation [23,24], and convoy electron production, is already known. The influence of the GDPR on electron capture by fast highly charged ions from a free fullerene molecule has been studied using an x-ray technique [25].…”

Section: Introductionmentioning

confidence: 99%

Angle-differential observation of plasmon electrons in the double-differential cross-section spectra of fast-ion-induced electron ejection fromC60

2015

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We report on the measurement of double-differential distribution of soft electron emission from C 60 fullerene, induced by a fast-moving Coulomb field of 76 MeV energy bare fluorine ions. A broad "plasmon-electron" peak, riding on the Coulomb-ionization continuum, is observed due to the deexcitation of the giant dipole plasmon resonance state in C 60 . The angular distribution of the plasmon electrons goes through a dip around 90• , which is contrary to that observed in ion-atom collisions measured in situ, indicating the alignment of the induced dipole moment along the projectile beam direction. A model based on the photoelectron angular distribution which is modified due to the ion-induced postcollisional interaction provides an excellent agreement with the observed asymmetric distribution. The distribution smoothly changes from a dip at 90• to a peak with the variation of ejected electron energy indicating transition from a collective plasmon behavior of the whole system to a single ion-atom interaction. The single-differential cross section was also derived, which preserves the signature of the collective excitation.

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Radiative electron capture by fully stripped channeled light ions

Cited by 18 publications

References 27 publications

Experimental study of K-shell ionization of low-Zsolids in collisions with intermediate-velocity carbon ions and the local plasma approximation

Experimental study of K-shell ionization of low-Zsolids in collisions with intermediate-velocity carbon ions and the local plasma approximation

Differential electron emission in the ionization of Ne and Xe atoms under fast bare carbon ion impact

Angle-differential observation of plasmon electrons in the double-differential cross-section spectra of fast-ion-induced electron ejection fromC60

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