Electronic stopping of low-energy H and He in Cu and Au investigated by time-of-flight low-energy ion scattering

Markin, S.N.; Primetzhofer, Daniel; Spitz, Martin; Bauer, Péter

doi:10.1103/physrevb.80.205105

Cited by 80 publications

(48 citation statements)

References 28 publications

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“…Furthermore, some previous studies with a similar methodology have resulted in a nonlinear velocity scaling of ε that is different from the modeling in the program and that was in excellent agreement with other results obtained in transmission (compare, for example, Refs. [19] and [20] as well as Refs. [22] and [23]).…”

Section: Experiments and Evaluationmentioning

confidence: 81%

“…Indeed, many investigated systems have been found to show this behavior; for metals with occupied electronic states up to the Fermi level E F and unoccupied states available directly above E F this can be also well understood. Due to the excitation thresholds of certain electronic states and the limited maximum energy transfer in a binary collision, pronounced deviations have been found at sufficiently low energies, i.e., below 10 keV for protons or ß25 keV for He ions, for some noble metals and semiconducting and insulating materials [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Electronic interactions of medium-energy ions in hafnium dioxide

Primetzhofer

2014

Phys. Rev. A

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In this article, the electronic interaction of medium-energy ions with hafnium dioxide is studied. Stopping cross sections for He ions in the energy range from 30 to 160 keV have been measured in backscattering experiments from thin films of HfO 2 on Si using time-of-flight medium-energy ion scattering. The observed energy loss for helium ions is found to be high compared to expectations from earlier results for hydrogen in HfO 2 , a result which indicates a contribution from energy-loss processes that is different from direct excitation of electron-hole pairs in close collisions. Furthermore, data exhibit a significant deviation from velocity proportionality. A discussion of the results, together with data from studies for H and He in SiO 2 , show characteristic differences which are traced back to different electronic structures of the target materials and their influence on the charge-exchange channels that are active in the interaction with helium. Charge exchange, in turn, via shifted mean-charge states, will influence the observed ionization along the ion track. The results can furthermore serve as reference values for ion-beam-based depth profiling at medium and low ion energies.

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Section: Experiments and Evaluationmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Electronic interactions of medium-energy ions in hafnium dioxide

Primetzhofer

2014

Phys. Rev. A

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“…Note that for He scattered from polycrystalline Cu it was possible to quantitatively reproduce the energy spectrum in a wide energy range including the surface peak by a Monte Carlo (MC) simulation, which includes only multiple elastic collisions and electronic stopping along the trajectory [27]. It is, however, still an open question whether impact parameterdependent inelastic losses are responsible for the observed major discrepancies between electronic stopping data deduced from TR and BS experiments [4,6,7,28]. In this context it is interesting that around the stopping maximum electronic stopping data are consistent within experimental uncertainties ( ± 3%) when obtained in transmission and backscattering geometries [29].…”

Section: Transmission Versus Backscatteringmentioning

confidence: 99%

“…The constant Q, usually referred to as "friction coefficient," is a function of the atomic number of the ion Z 1 , and of the electron density of the FEG n e , usually expressed in terms of the one-electron radius, r s = (3/4πn e ) 1/3 , and has been modeled in detail [2,3]. Experiments revealed that electronic stopping of H and for He ions may exhibit a more sophisticated velocity dependence even when v v F , due to a more complex band structure of the conduction electrons in real metals [4][5][6][7][8] or in band gap materials [9][10][11][12][13]. Also charge exchange processes have been found to contribute efficiently to electronic energy loss [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Energy loss of low-energy ions in transmission and backscattering experiments

et al. 2013

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The determination of the electronic stopping power for low-energy ions is an experimentally demanding task. In this paper we elaborate on the different effects of nuclear stopping and multiple scattering on the energy spectra for different experimental geometries, i.e., transmission through thin foils and backscattering from thin films. By calculating distributions of path lengths and scattering angles we demonstrate how electronic stopping, nuclear stopping, and multiple scattering add up to the total energy loss. We show that at low energies it is important to properly disentangle these effects to extract electronic stopping from the measured energy loss spectra.

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“…A special attention is paid to the electronic stopping of light ions with low velocities in noble metals (Au, Ag and Cu). In noble metals, the measured SP of slow protons has shown unexpected deviations from the velocity proportionality, and a complex structure of the SP versus ion velocity is observed in the range of low energies [23][24][25].…”

Section: Introductionmentioning

confidence: 92%