New beam line for time-of-flight medium energy ion scattering with large area position sensitive detector

Linnarsson, M. K.; Hallén, Anders; Åström, Jonas; Primetzhofer, Daniel; Legendre, Sébastien; Possnert, Göran

doi:10.1063/1.4750195

Cited by 61 publications

(45 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…37 Atomic and molecular ions with primary energies E 0 in the range of 25-170 keV were employed: Molecular ions (H 2 + and D 2 + ) extend the range of accessible energies to E 0 /2, where vicinage effects 38 are negligible. 39 Sets of thin films of amorphous Au and Pt were evaporated in different thicknesses on top of cleaned Si wafers using a high-fluence evaporation system.…”

Section: Methodsmentioning

confidence: 99%

Inelastic energy loss of medium energy H and He ions in Au and Pt: Deviations from velocity proportionality

Primetzhofer

2012

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

Electronic energy loss of light ions in nm films of Au and Pt has been studied at keV ion energies. For H the electronic stopping power S is found to exhibit the expected velocity proportionality at low ion velocities, which confirms the anticipated excitation mechanisms responsible for the energy transfer between ions and the electrons in the solid. In contrast, for He, S shows a clear deviation from velocity proportionality for both materials at ion velocities below 0.8 atomic units, i.e., 64 keV. This result indicates a change in the interaction mechanisms active at the investigated ion velocities, which cannot exclusively be interpreted from the density of states of the target. Instead, the more complex electronic structure of the He ion enables an additional energy loss channel due to charge exchange by atomic level promotion. Associated energy losses together with a changed equilibrium charge state permit an explanation of the observed phenomenon.

show abstract

Section: Methodsmentioning

confidence: 99%

Inelastic energy loss of medium energy H and He ions in Au and Pt: Deviations from velocity proportionality

Primetzhofer

2012

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…The energy-loss experiments were performed with the time-of-flight MEIS (TOF-MEIS) setup at Uppsala University [45]. A large solidangle microchannel-plate (MCP) detector (the diameter of the active area was 120 mm at a distance of 300 mm, which results in a ß0.12 sr solid angle) which can be rotated around the sample permits one to record position-sensitive time spectra for different scattering angles in backscattering geometry.…”

Section: Experiments and Evaluationmentioning

confidence: 99%

Electronic interactions of medium-energy ions in hafnium dioxide

Primetzhofer

2014

Phys. Rev. A

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Time-of-flight elastic recoil detection (TOF-ERD) measurements at Uppsala University yielded the expected stoichiometry and impurity concentrations below ~ 2 %. Time-of-flight medium energy ion scattering (TOF-MEIS) [33] was employed to check the homogeneity of thin film samples. TOF-LEIS spectra were recorded using hydrogen and deuterium beams (monomers and dimers) in the range of 0.5 keV/u -10 keV/u.…”

Section: (1 Kev Protons)mentioning

confidence: 99%

Electronic Stopping of Slow Protons in Oxides: Scaling Properties

et al. 2017

Self Cite

View full text Add to dashboard Cite

Electronic stopping of slow protons in ZnO, VO2 (metal and semiconductor phases), HfO2 and Ta2O5 was investigated experimentally. As a comparison of the resulting stopping cross sections (SCS) to data for Al2O3 and SiO2 reveals, electronic stopping of slow protons does not correlate with electronic properties of the specific material such as band gap energies.Instead, the oxygen 2p states are decisive, as corroborated by DFT calculations of the electronic densities of states. Hence, at low ion velocities the SCS of an oxide primarily scales with its oxygen density.

show abstract

New beam line for time-of-flight medium energy ion scattering with large area position sensitive detector

Cited by 61 publications

References 19 publications

Inelastic energy loss of medium energy H and He ions in Au and Pt: Deviations from velocity proportionality

Inelastic energy loss of medium energy H and He ions in Au and Pt: Deviations from velocity proportionality

Electronic interactions of medium-energy ions in hafnium dioxide

Electronic Stopping of Slow Protons in Oxides: Scaling Properties

Contact Info

Product

Resources

About