The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform

J Schwartz - One of the best experts on this subject based on the ideXlab platform.

  • local formation of nitrogen vacancy centers in diamond by swift Heavy Ions
    Journal of Applied Physics, 2014
    Co-Authors: J Schwartz, Shaul Aloni, D F Ogletree, M Tomut, M Bender, Daniel Severin, C Trautmann, I W Rangelow, T Schenkel
    Abstract:

    We exposed nitrogen-implanted diamonds to beams of swift Heavy Ions (∼1 GeV, ∼4 MeV/u) and find that these irradiatIons lead directly to the formation of nitrogen vacancy (NV) centers, without thermal annealing. We compare the photoluminescence intensities of swift Heavy ion activated NV− centers to those formed by irradiation with low-energy electrons and by thermal annealing. NV− yields from irradiatIons with swift Heavy Ions are 0.1 of yields from low energy electrons and 0.02 of yields from thermal annealing. We discuss possible mechanisms of NV center formation by swift Heavy Ions such as electronic excitatIons and thermal spikes. While forming NV centers with low efficiency, swift Heavy Ions could enable the formation of three dimensional NV− assemblies over relatively large distances of tens of micrometers. Further, our results show that NV center formation is a local probe of (partial) lattice damage relaxation induced by electronic excitatIons from swift Heavy Ions in diamond.

  • local formation of nitrogen vacancy centers in diamond by swift Heavy Ions
    arXiv: Materials Science, 2014
    Co-Authors: J Schwartz, Shaul Aloni, D F Ogletree, M Tomut, M Bender, Daniel Severin, C Trautmann, I W Rangelow, T Schenkel
    Abstract:

    We exposed nitrogen-implanted diamonds to beams of swift uranium and gold Ions (~1 GeV) and find that these irradiatIons lead directly to the formation of nitrogen vacancy (NV) centers, without thermal annealing. We compare the photoluminescence intensities of swift Heavy ion activated NV- centers to those formed by irradiation with low-energy electrons and by thermal annealing. NV- yields from irradiatIons with swift Heavy Ions are 0.1 of yields from low energy electrons and 0.02 of yields from thermal annealing. We discuss possible mechanisms of NV-center formation by swift Heavy Ions such as electronic excitatIons and thermal spikes. While forming NV centers with low efficiency, swift Heavy Ions enable the formation of three dimensional NV- assemblies over relatively large distances of tens of micrometers. Further, our results show that NV-center formation is a local probe of (partial) lattice damage relaxation induced by electronic excitatIons from swift Heavy Ions in diamond.

C Trautmann - One of the best experts on this subject based on the ideXlab platform.

  • synergistically enhanced ion track formation in pre damaged strontium titanate by energetic Heavy Ions
    Acta Materialia, 2018
    Co-Authors: Haizhou Xue, C Trautmann, Eva Zarkadoula, Ritesh Sachan, Yanwen Zhang, William J Weber
    Abstract:

    Abstract Latent ion tracks created by energetic Heavy Ions (12 MeV Ti to 946 MeV Au) in single crystal SrTiO3 are investigated using Rutherford backscattering spectrometry and scanning transmission electron microscopy. The results demonstrate that pre-existing irradiation damage, introduced via elastic collision processes, interacts synergistically with the electronic energy deposition from energetic Heavy Ions to enhance formation of latent ion tracks. The average amorphous cross-section increases with the level of pre-damage and is linearly proportional to the electronic energy loss of the Ions, with a slope dependent on the pre-damage level. For the highest energy Ions (629 MeV Xe and 946 MeV Au), the tracks are continuous over the pre-damaged depth, but become discontinuous beyond the pre-damaged region. This work provides new understanding and insights on ion-solid interactIons that significantly impact the interpretation of latent track formation processes, models of amorphization, and the fabrication of electro-ceramic devices.

  • local formation of nitrogen vacancy centers in diamond by swift Heavy Ions
    Journal of Applied Physics, 2014
    Co-Authors: J Schwartz, Shaul Aloni, D F Ogletree, M Tomut, M Bender, Daniel Severin, C Trautmann, I W Rangelow, T Schenkel
    Abstract:

    We exposed nitrogen-implanted diamonds to beams of swift Heavy Ions (∼1 GeV, ∼4 MeV/u) and find that these irradiatIons lead directly to the formation of nitrogen vacancy (NV) centers, without thermal annealing. We compare the photoluminescence intensities of swift Heavy ion activated NV− centers to those formed by irradiation with low-energy electrons and by thermal annealing. NV− yields from irradiatIons with swift Heavy Ions are 0.1 of yields from low energy electrons and 0.02 of yields from thermal annealing. We discuss possible mechanisms of NV center formation by swift Heavy Ions such as electronic excitatIons and thermal spikes. While forming NV centers with low efficiency, swift Heavy Ions could enable the formation of three dimensional NV− assemblies over relatively large distances of tens of micrometers. Further, our results show that NV center formation is a local probe of (partial) lattice damage relaxation induced by electronic excitatIons from swift Heavy Ions in diamond.

  • local formation of nitrogen vacancy centers in diamond by swift Heavy Ions
    arXiv: Materials Science, 2014
    Co-Authors: J Schwartz, Shaul Aloni, D F Ogletree, M Tomut, M Bender, Daniel Severin, C Trautmann, I W Rangelow, T Schenkel
    Abstract:

    We exposed nitrogen-implanted diamonds to beams of swift uranium and gold Ions (~1 GeV) and find that these irradiatIons lead directly to the formation of nitrogen vacancy (NV) centers, without thermal annealing. We compare the photoluminescence intensities of swift Heavy ion activated NV- centers to those formed by irradiation with low-energy electrons and by thermal annealing. NV- yields from irradiatIons with swift Heavy Ions are 0.1 of yields from low energy electrons and 0.02 of yields from thermal annealing. We discuss possible mechanisms of NV-center formation by swift Heavy Ions such as electronic excitatIons and thermal spikes. While forming NV centers with low efficiency, swift Heavy Ions enable the formation of three dimensional NV- assemblies over relatively large distances of tens of micrometers. Further, our results show that NV-center formation is a local probe of (partial) lattice damage relaxation induced by electronic excitatIons from swift Heavy Ions in diamond.

  • single ion induced surface nanostructures a comparison between slow highly charged and swift Heavy Ions
    Journal of Physics: Condensed Matter, 2011
    Co-Authors: F Aumayr, C Trautmann, Stefan Facsko, A S Elsaid, Marika Schleberger
    Abstract:

    This topical review focuses on recent advances in the understanding of the formation of surface nanostructures, an intriguing phenomenon in ion–surface interaction due to the impact of individual Ions. In many solid targets, swift Heavy Ions produce narrow cylindrical tracks accompanied by the formation of a surface nanostructure. More recently, a similar nanometric surface effect has been revealed for the impact of individual, very slow but highly charged Ions. While swift Ions transfer their large kinetic energy to the target via ionization and electronic excitation processes (electronic stopping), slow highly charged Ions produce surface structures due to potential energy deposited at the top surface layers. Despite the differences in primary excitation, the similarity between the nanostructures is striking and strongly points to a common mechanism related to the energy transfer from the electronic to the lattice system of the target. A comparison of surface structures induced by swift Heavy Ions and slow highly charged Ions provides a valuable insight to better understand the formation mechanisms.

T Schenkel - One of the best experts on this subject based on the ideXlab platform.

  • local formation of nitrogen vacancy centers in diamond by swift Heavy Ions
    Journal of Applied Physics, 2014
    Co-Authors: J Schwartz, Shaul Aloni, D F Ogletree, M Tomut, M Bender, Daniel Severin, C Trautmann, I W Rangelow, T Schenkel
    Abstract:

    We exposed nitrogen-implanted diamonds to beams of swift Heavy Ions (∼1 GeV, ∼4 MeV/u) and find that these irradiatIons lead directly to the formation of nitrogen vacancy (NV) centers, without thermal annealing. We compare the photoluminescence intensities of swift Heavy ion activated NV− centers to those formed by irradiation with low-energy electrons and by thermal annealing. NV− yields from irradiatIons with swift Heavy Ions are 0.1 of yields from low energy electrons and 0.02 of yields from thermal annealing. We discuss possible mechanisms of NV center formation by swift Heavy Ions such as electronic excitatIons and thermal spikes. While forming NV centers with low efficiency, swift Heavy Ions could enable the formation of three dimensional NV− assemblies over relatively large distances of tens of micrometers. Further, our results show that NV center formation is a local probe of (partial) lattice damage relaxation induced by electronic excitatIons from swift Heavy Ions in diamond.

  • local formation of nitrogen vacancy centers in diamond by swift Heavy Ions
    arXiv: Materials Science, 2014
    Co-Authors: J Schwartz, Shaul Aloni, D F Ogletree, M Tomut, M Bender, Daniel Severin, C Trautmann, I W Rangelow, T Schenkel
    Abstract:

    We exposed nitrogen-implanted diamonds to beams of swift uranium and gold Ions (~1 GeV) and find that these irradiatIons lead directly to the formation of nitrogen vacancy (NV) centers, without thermal annealing. We compare the photoluminescence intensities of swift Heavy ion activated NV- centers to those formed by irradiation with low-energy electrons and by thermal annealing. NV- yields from irradiatIons with swift Heavy Ions are 0.1 of yields from low energy electrons and 0.02 of yields from thermal annealing. We discuss possible mechanisms of NV-center formation by swift Heavy Ions such as electronic excitatIons and thermal spikes. While forming NV centers with low efficiency, swift Heavy Ions enable the formation of three dimensional NV- assemblies over relatively large distances of tens of micrometers. Further, our results show that NV-center formation is a local probe of (partial) lattice damage relaxation induced by electronic excitatIons from swift Heavy Ions in diamond.

Mitoshi Fujimoto - One of the best experts on this subject based on the ideXlab platform.

  • Preferential acceleration of Heavy Ions in the reconnection outflow region Drift and surfatron ion acceleration
    Astronomy and Astrophysics - A&A, 2014
    Co-Authors: A V Artemyev, Giuseppe Zimbardo, Aleksandr Y. Ukhorskiy, Mitoshi Fujimoto
    Abstract:

    Context. Many observatIons show that heating in the solar corona should be more effective for Heavy Ions than for protons. Moreover, the efficiency of particle heating also seems to be larger for a larger particle electric charge. The transient magnetic reconnection is one of the most natural mechanisms of charged particle acceleration in the solar corona. However, the role of this process in preferential acceleration of Heavy Ions has still yet to be investigated. Aims. In this paper, we consider charged particle acceleration in the reconnection outflow region. We investigate the dependence of efficiency of various mechanisms of particle acceleration on particle charge and mass. Methods. We take into account recent in situ spacecraft observatIons of the nonlinear magnetic waves that have originated in the magnetic reconnection. We use analytical estimates and test-particle trajectories to study resonant and nonresonant particle acceleration by these nonlinear waves. Results. We show that resonant acceleration of Heavy Ions by nonlinear magnetic waves in the reconnection outflow region is more effective for Heavy Ions and/or for Ions with a larger electric charge. Nonresonant acceleration can be considered as a combination of particle reflectIons from the front of the nonlinear waves. Energy gain for a single reflection is proportional to the particle mass, while the maximum possible gain of energy corresponds to the classical betatron heating. ConclusIons. Small-scale transient magnetic reconnectIons produce nonlinear magnetic waves propagating away from the reconnec-tion region. These waves can effectively accelerate Heavy Ions in the solar corona via resonant and nonresonnat regimes of interactIons. This mechanism of acceleration is more effective for Ions with a larger mass and/or with a larger electric charge.

  • Preferential acceleration of Heavy Ions in the reconnection outflow region Drift and surfatron ion acceleration
    Astronomy and Astrophysics - A&A, 2014
    Co-Authors: A V Artemyev, Giuseppe Zimbardo, Aleksandr Y. Ukhorskiy, Mitoshi Fujimoto
    Abstract:

    Context. Many observatIons show that heating in the solar corona should be more effective for Heavy Ions than for protons. Moreover, the efficiency of particle heating also seems to be larger for a larger particle electric charge. The transient magnetic reconnection is one of the most natural mechanisms of charged particle acceleration in the solar corona. However, the role of this process in preferential acceleration of Heavy Ions has still yet to be investigated. Aims. In this paper, we consider charged particle acceleration in the reconnection outflow region. We investigate the dependence of efficiency of various mechanisms of particle acceleration on particle charge and mass. Methods. We take into account recent in situ spacecraft observatIons of the nonlinear magnetic waves that have originated in the magnetic reconnection. We use analytical estimates and test-particle trajectories to study resonant and nonresonant particle acceleration by these nonlinear waves. Results. We show that resonant acceleration of Heavy Ions by nonlinear magnetic waves in the reconnection outflow region is more effective for Heavy Ions and/or for Ions with a larger electric charge. Nonresonant acceleration can be considered as a combination of particle reflectIons from the front of the nonlinear waves. Energy gain for a single reflection is proportional to the particle mass, while the maximum possible gain of energy corresponds to the classical betatron heating. ConclusIons. Small-scale transient magnetic reconnectIons produce nonlinear magnetic waves propagating away from the reconnec-tion region. These waves can effectively accelerate Heavy Ions in the solar corona via resonant and nonresonnat regimes of interactIons. This mechanism of acceleration is more effective for Ions with a larger mass and/or with a larger electric charge.

William J Weber - One of the best experts on this subject based on the ideXlab platform.

  • synergistically enhanced ion track formation in pre damaged strontium titanate by energetic Heavy Ions
    Acta Materialia, 2018
    Co-Authors: Haizhou Xue, C Trautmann, Eva Zarkadoula, Ritesh Sachan, Yanwen Zhang, William J Weber
    Abstract:

    Abstract Latent ion tracks created by energetic Heavy Ions (12 MeV Ti to 946 MeV Au) in single crystal SrTiO3 are investigated using Rutherford backscattering spectrometry and scanning transmission electron microscopy. The results demonstrate that pre-existing irradiation damage, introduced via elastic collision processes, interacts synergistically with the electronic energy deposition from energetic Heavy Ions to enhance formation of latent ion tracks. The average amorphous cross-section increases with the level of pre-damage and is linearly proportional to the electronic energy loss of the Ions, with a slope dependent on the pre-damage level. For the highest energy Ions (629 MeV Xe and 946 MeV Au), the tracks are continuous over the pre-damaged depth, but become discontinuous beyond the pre-damaged region. This work provides new understanding and insights on ion-solid interactIons that significantly impact the interpretation of latent track formation processes, models of amorphization, and the fabrication of electro-ceramic devices.