Neutralization of 50-230-keV hydrogen ions which have penetrated Al, Au, C, and Cs films

Kreussler, S.; Sizmann, R.

doi:10.1103/physrevb.26.520

Cited by 45 publications

(16 citation statements)

References 12 publications

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“…Making analogy with the analysis of experiments on grazing scattering of protons on an Al surface [46] and referring to the data on proton transmission through carbon foils [47], one may expect that the Z 1 = 1 charge state would be the most dominant fraction for protons channeled in carbon nanotubes at the speeds in excess of v = 3. Nevertheless, simultaneous measurements of the angular distributions of transmitted particles in different charge states could reveal a wealth of information on both the image interactions and the charge transfer processes taking place in short nanotubes, in close analogy with the experiments done by Winter [35,46].…”

Section: Theorymentioning

confidence: 99%

Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media

et al. 2008

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The best level of ordering and straightening of carbon nanotube arrays is often achieved when they are grown in a dielectric matrix, so such structures present the most suitable candidates for future channeling experiments with carbon nanotubes. Consequently, we investigate here how the dynamic polarization of carbon valence electrons in the presence of various surrounding dielectric media affects the angular distributions of protons channeled through (11, 9) single-wall carbon nanotubes. Proton speeds between 3 and 10 a.u., corresponding to energies of 0.223 and 2.49 MeV, are chosen with the nanotube's length varied between 0.1 and 1 µm. We describe the repulsive interaction between a proton and the nanotube's atoms in a continuum-potential approximation based on the Doyle-Turner potential, whereas the attractive image force on a proton is calculated using a twodimensional hydrodynamic model for the dynamic response of the nanotube valence electrons, while assigning to the surrounding medium an appropriate (frequency dependent) dielectric function. The angular distributions of channeled protons are generated using a computer simulation method which solves the proton equations of motion in the transverse plane numerically. Our analysis shows that the presence of a dielectric medium can strongly affect both the appearance and positions of maxima in the angular distributions of channeled protons.

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Section: Theorymentioning

confidence: 99%

Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media

et al. 2008

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“…Fortunately, the fraction of the neutral hydrogen ions in the beam after penetrating an aluminum foil can be measured by standard spectrometers, such as a magnetic mass spectrometer. Furthermore, the ion fractions after penetrating an aluminum foil about 20 µg/cm 2 in thickness have been measured by Kreussler et al 14 in the 50-230 keV energy range. Considering the neutralization of the hydrogen ions, the hydrogen ion fraction can be given as…”

Section: Application To a Vacuum Arc Hydrogen Ion Sourcementioning

confidence: 99%

A simple and compact method for measuring the hydrogen ion fraction of hybrid ion beams

Jiang¹,

Changgeng²,

Qiu³

et al. 2016

AIP Advances

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A simple and compact method for measuring the hydrogen fraction of hybrid ion beams is introduced in this paper. The method is based on the difference of stopping powers for protons and other heavier ions. This method was used in a measurement of the hydrogen ion fraction of a beam produced by a vacuum arc ion source, and was also proposed to be used in quasi-mono-energetic laser accelerators. In the vacuum arc ion source case, results obtained by this method agree well with that measured by time-of-flight spectrometry and magnetic mass analysis methods.

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“…In the case of swift protons moving through a solid target, there are two charge states (þ1 and 0) for which the charge fractions are important in the velocity region we will discuss [1][2][3][4][5]. Therefore, the stopping power of the target for the system H þ /H 0 can be written as…”

Section: Modelmentioning

confidence: 99%

“…S C&L is the stopping power that corresponds to the energy loss due to the electronic capture and loss processes. We obtain the value of / 0 by a fitting to the available data [1][2][3][4][5] and…”

Section: Modelmentioning

confidence: 99%

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Projectile polarization effects in the energy loss of swift ions in solids

Heredia-Ávalos

García-Molina

2002

Nuclear Instruments and Methods in Physics Research Section B:

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We have evaluated the energy loss of swift hydrogen ions moving through a solid target, paying special attention to the effect due to the polarization of the projectile. Our calculation is done in the framework of the dielectric formalism, taking into account the contribution to the energy loss due to the charge fraction of protons and hydrogen atoms, the electronic capture and loss processes, and the polarization of the projectile. The electronic structure of the projectile is described by a hydrogen-like model screened by the target electrons. We have found that the polarization of the projectile is a non-negligible contribution to the energy loss of the hydrogen atoms in the energy range around the maximum of the stopping power. The calculated stopping power (accounting for all the above mentioned effects) agrees satisfactorily well with the experimental data in a wide projectile velocity region. Ó

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Neutralization of 50-230-keV hydrogen ions which have penetrated Al, Au, C, and Cs films

Cited by 45 publications

References 12 publications

Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media

Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media

A simple and compact method for measuring the hydrogen ion fraction of hybrid ion beams

Projectile polarization effects in the energy loss of swift ions in solids

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