1,721,027 research outputs found
Electronic structure calculations applied to spectroscopic studies of some metal atoms
Get PDFAbstractIn this thesis, the electronic structure and electrodynamical processes of atomic mercury and potassium are studied experimentally and theoretically. Experimental measurements were carried out by means of both conventional photoelectron spectroscopy and multielectron coincidence technique utilizing magnetic bottle time-of-flight electron spectrometer together with pulsed synchrotron radiation. The thesis focuses on the theoretical modelling and interpretation of the experimentally observed transitions and binding energies. The calculations were carried out with relativistic multiconfiguration Dirac-Fock (MCDF) and non-relativistic Hartree-Fock (MCHF) methods. Theoretical results were used to interpret the experimental data in order to study the electron binding energy level structure and electron transition dynamics of these atoms.Original papersOriginal papers are not included in the electronic version of the dissertation.Khalal, M. A., Soronen, J., Jänkälä, K., Huttula, S.-M., Huttula, M., Bizau, J.-M., Cubaynes, D., Guilbaud, S., Ito, K., Andric, L., Feng, J., Lablanquie, P., Palaudoux, J., & Penent, F. (2017). Multielectron spectroscopy: energy levels of Kn+and Rbn+ions (n= 2, 3, 4). Journal of Physics B: Atomic, Molecular and Optical Physics, 50(22), 225003. https://doi.org/10.1088/1361-6455/aa90d6Self-archived versionPalaudoux, J., Sheinerman, S., Soronen, J., Huttula, S.-M., Huttula, M., Jänkälä, K., Andric, L., Ito, K., Lablanquie, P., Penent, F., Bizau, J.-M., Guilbaud, S., & Cubaynes, D. (2015). Valence Auger decay following 3s photoionization in potassium. Physical Review A, 92(1). https://doi.org/10.1103/physreva.92.012510Huttula, S.-M., Soronen, J., Huttula, M., Penent, F., Palaudoux, J., Andric, L., & Lablanquie, P. (2015). Auger decay of core valence double photoionized states in atomic mercury. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(11), 115001. https://doi.org/10.1088/0953-4075/48/11/115001Soronen, J., Aho, S.-M., Huttula, M., Penent, F., Palaudoux, J., Andric, L., & Lablanquie, P. (2021). Photoionization and subsequent Auger decay of atomic potassium 2s subshell. Manuscript in preparation.OsajulkaisutOsajulkaisut eivät sisälly väitöskirjan elektroniseen versioon.Khalal, M. A., Soronen, J., Jänkälä, K., Huttula, S.-M., Huttula, M., Bizau, J.-M., Cubaynes, D., Guilbaud, S., Ito, K., Andric, L., Feng, J., Lablanquie, P., Palaudoux, J., & Penent, F. (2017). Multielectron spectroscopy: energy levels of Kn+and Rbn+ions (n= 2, 3, 4). Journal of Physics B: Atomic, Molecular and Optical Physics, 50(22), 225003. https://doi.org/10.1088/1361-6455/aa90d6Rinnakkaistallennettu versioPalaudoux, J., Sheinerman, S., Soronen, J., Huttula, S.-M., Huttula, M., Jänkälä, K., Andric, L., Ito, K., Lablanquie, P., Penent, F., Bizau, J.-M., Guilbaud, S., & Cubaynes, D. (2015). Valence Auger decay following 3s photoionization in potassium. Physical Review A, 92(1). https://doi.org/10.1103/physreva.92.012510Huttula, S.-M., Soronen, J., Huttula, M., Penent, F., Palaudoux, J., Andric, L., & Lablanquie, P. (2015). Auger decay of core valence double photoionized states in atomic mercury. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(11), 115001. https://doi.org/10.1088/0953-4075/48/11/115001Soronen, J., Aho, S.-M., Huttula, M., Penent, F., Palaudoux, J., Andric, L., & Lablanquie, P. (2021). Photoionization and subsequent Auger decay of atomic potassium 2s subshell. Manuscript in preparation.Academic Dissertation to be presented with the assent of the Doctoral Training Committee of Technology and Natural Sciences of University of Oulu for public discussion in the Auditorium IT115, on September 10th, 2021, at 12 o’clock noon.Abstract
In this thesis, the electronic structure and electrodynamical processes of atomic mercury and potassium are studied experimentally and theoretically. Experimental measurements were carried out by means of both conventional photoelectron spectroscopy and multielectron coincidence technique utilizing magnetic bottle time-of-flight electron spectrometer together with pulsed synchrotron radiation. The thesis focuses on the theoretical modelling and interpretation of the experimentally observed transitions and binding energies. The calculations were carried out with relativistic multiconfiguration Dirac-Fock (MCDF) and non-relativistic Hartree-Fock (MCHF) methods. Theoretical results were used to interpret the experimental data in order to study the electron binding energy level structure and electron transition dynamics of these atoms
Interpretation and relativistic simulation of selected electronic transitions : Decays of <em>M</em>-shell hole states in atomic Cr, Br and Rb
Get PDFAbstractIn this thesis electronic structure of atomic chromium, rubidium and bromine are studied experimentally and theoretically through transitions and decay processes originating from selected M-shell hole states. The experiments are conducted with traditional methods of electron spectroscopy as well as more recent multicoincidence methods using pulsed synchrotron radiation and a magnetic bottle spectrometer. The observed electronic transitions are theoretically simulated with multiconfiguration Dirac-Fock method. Finally, the calculations are used to interpret the measured spectra to investigate the energy level structure and electron dynamics of the studied elements.Original papersOriginal papers are not included in the electronic version of the dissertation.Keskinen, J., Huttula, S.-M., Mäkinen, A., Patanen, M., & Huttula, M. (2015). Experimental and theoretical study of 3p photoionization and subsequent Auger decay in atomic chromium. Radiation Physics and Chemistry, 117, 209–216. https://doi.org/10.1016/j.radphyschem.2015.08.018Keskinen, J., Lablanquie, P., Penent, F., Palaudoux, J., Andric, L., Cubaynes, D., … Jänkälä, K. (2017). Initial-state-selected MNN Auger spectroscopy of atomic rubidium. Physical Review A, 95(4). https://doi.org/10.1103/physreva.95.043402Self-archived versionKeskinen, J., Jänkälä, K., Huttula, S.-M., Kaneyasu, T., Hikosaka, Y., Shigemasa, E., … Lablanquie, P. (2019). Auger decay of the 3d hole in the isoelectronic series of Br*, Kr⁺ and Rb²⁺. Manuscript in preparation.OsajulkaisutOsajulkaisut eivät sisälly väitöskirjan elektroniseen versioon.Keskinen, J., Huttula, S.-M., Mäkinen, A., Patanen, M., & Huttula, M. (2015). Experimental and theoretical study of 3p photoionization and subsequent Auger decay in atomic chromium. Radiation Physics and Chemistry, 117, 209–216. https://doi.org/10.1016/j.radphyschem.2015.08.018Keskinen, J., Lablanquie, P., Penent, F., Palaudoux, J., Andric, L., Cubaynes, D., … Jänkälä, K. (2017). Initial-state-selected MNN Auger spectroscopy of atomic rubidium. Physical Review A, 95(4). https://doi.org/10.1103/physreva.95.043402Rinnakkaistallennettu versioKeskinen, J., Jänkälä, K., Huttula, S.-M., Kaneyasu, T., Hikosaka, Y., Shigemasa, E., … Lablanquie, P. (2019). Auger decay of the 3d hole in the isoelectronic series of Br*, Kr⁺ and Rb²⁺. Manuscript in preparation.Academic Dissertation to be presented with the assent of the Doctoral Training Committee of Technology and Natural Sciences of the University of Oulu for public discussion in the Auditorium L2, on December 13th, 2019, at 12 o’clock noon.Abstract
In this thesis electronic structure of atomic chromium, rubidium and bromine are studied experimentally and theoretically through transitions and decay processes originating from selected M-shell hole states. The experiments are conducted with traditional methods of electron spectroscopy as well as more recent multicoincidence methods using pulsed synchrotron radiation and a magnetic bottle spectrometer. The observed electronic transitions are theoretically simulated with multiconfiguration Dirac-Fock method. Finally, the calculations are used to interpret the measured spectra to investigate the energy level structure and electron dynamics of the studied elements
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
