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19 results on '"Marinkovic, B P"'

1. The role of some collisional processes in AGNs: rate coefficients needed for modeling

Author

Dimitrijevic, M. S., Sreckovic, V. A., Ignjatovic, Lj. M., and Marinkovic, B. P.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

The importance of some atom hydrogen collisions in AGN has been investigated. The results are useful for better estimate of the hydrogen Balmer lines uxes, which usage for effective temperature diagnostics in astrophysical plasma is limited by errors from the line formation models. The data could be also useful for modeling cooler and denser parts of AGN BLR clouds, as well as for the investigation of Rydberg states of hydrogen and for the study of their in uence during the cosmological recombination epoch. The results of the present work suggest that the investigated processes are of interest for the research and modelling of such media., Comment: 17 pages, 3 figures

Published
2018

10. Electron-impact excitation of the (4d(10)5s) S-2(1/2)-> (4d(9)5s(2)) D-2(3/2) and (4d(10)6s) S-2(1/2) ->(4d(10)6s) 2S(1/ 2) transitions in silver: Experiment and theory

Author

Marinkovic, B. P., Tosic, S. D., Sevic, D., McEachran, R. P., Blanco Ramos, Francisco, García, G., and Brunger, M. J.

Subjects
Física nuclear
Abstract

We present angle-differential and angle-integrated cross sections for electron-impact excitation of the (4d(10)5s) S-2(1/ 2) -> (4d(9)5s(2)) D-2(3/ 2) and (4d(10)5s) S-2(1/ 2) ->(4d(10)6s) S-2(1/ 2) transitions in atomic silver. Experimental data for four incident electron energies between 10 and 60 eV are compared with predictions from our relativistic distorted wave (RDW) and nonrelativistic atomic optical potential models. Agreement between our measured and calculated data is only fair, although in the case of the RDW it is seen to improve with increasing incident electron energy. However, only for the (4d(10)6s) S-2(1/2) excitation process, agreement of our measured data with earlier relativistic convergent close coupling results from McNamara et al. [J. Phys. B 51, 085203 (2018)] was, with a few exceptions, typically observed to be very good, to within the uncertainties on the data.

Published
2021

11. Luminescence thermometry based on Y2O2S:Er,Yb nanophosphor.

Author

Sevic, D., Rabasovic, M. S., Križan, J., Savic-Sevic, S., Marinkovic, B. P., and Nikolic, M. G.

Abstract

We present possibility analysis of using Y2O2S:Er,Yb for temperature sensing. Material samples were obtained by solution combustion method. We have used pulsed laser diode excitation at 980 nm. Our analysis is based on time resolved luminescence spectra acquired by a streak camera. Intensity ratios of prominent luminescence peaks were used for determining the temperature sensing curves. We compare the synthesized Y2O2S:Er,Yb material with other thermophosphors, showing its usefulness for temperature measurements up to 620 K. [ABSTRACT FROM AUTHOR]

Published
2022
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12. Electron-impact excitation of the (5s(2)5p) P-2(1/2) -> (5s(2)6s) S-2(1/2) transition in indium: Theory and experiment

Author

Hamilton, K. R., Zatsarinny, O., Bartschat, K., Rabasovic, M. S., Sevic, D., Marinkovic, B. P., Dujko, S., Atic, J., Fursa, D. V., Bray, I., McEachran, R. P., Blanco Ramos, Francisco, García, G., Stokes, P. W., White, R. D., and Brunger, M. J.

Subjects
Física nuclear
Abstract

We present angle-integrated and angle-differential cross sections for electron-impact excitation of the (5s(2)5p) P-2(1/2) -> (5s(2)6s) S-2(1/2) transition in atomic indium. Experimental data for six incident electron energies between 10 and 100 eV are compared with predictions from semirelativistic and fully relativistic B-spline R-matrix calculations, as well as a fully relativistic convergent close-coupling model. Agreement between our measured and calculated data is, with a few exceptions, found to be typically very good. Additionally, the agreement between the present theoretical predictions is generally excellent, with the remaining small deviations being associated with the slightly different, although still very accurate, descriptions of the target structure. Agreement between the present results and an earlier relativistic distorted-wave computation [T. Das, R. Srivastava, and A. D. Stauffer, Phys. Lett. A 375, 568 (2011)] was, however, found to be marginal, particularly at 10 and 20 eV.

Published
2020

13. Joint theoretical and experimental study on elastic electron scattering from bismuth

Author

Predojevic, B., Sevic, D., Marinkovic, B. P., McEachran, R. P., Blanco Ramos, Francisco, García, G., Brunger, M- J., Predojevic, B., Sevic, D., Marinkovic, B. P., McEachran, R. P., Blanco Ramos, Francisco, García, G., and Brunger, M- J.

Abstract

©2020 American Physical Society. This work was financially supported, in part, by the Spanish Ministerio de Ciencia, Innovación y Universidades (Project No. FIS2016-80440), CSIC (Project No. LINKA20085), the Australian Research Council (Projects No. DP160102787 and No. DP180101655), the Ministry of Education, Science and Technological Development (Project No. OI171020) of the Republic of Serbia, and the Ministry of Scientific and Technological Development, Higher Education and Information Society (Project No. 19/6-020/961-67/18) of the Republic of Srpska, Bosnia, and Herzegovina. We thank Dr. L. Campbell for his help with some aspects of this paper., We report on experimental elastic differential and integral cross sections for electron scattering from bismuth. The energy range of those measurements is 10-100 eV, while the scattered electron angular range in the differential cross section data is 10 degrees-150 degrees. We also supplement our experimental results with theoretical data from our optical potential approach, in this case applying two different sets of scattering potentials to the problem. Good overall qualitative accord is typically observed between our measured and calculated results, particularly when allowance is made for the dimer contribution in the experimental atomic beam., Ministerio de Ciencia e Innovación (MICINN), Consejo Superior de Investigaciones Científicas (CSIC), Australian Research Council, Ministry of Education, Science and Technological Development of the Republic of Serbia, Ministry of Scientific and Technological Development, Higher Education and Information Society of the Republic of Srpska, Ministry of Scientific and Technological Development, Higher Education and Information Society of the Republic of Bosnia, Ministry of Scientific and Technological Development, Higher Education and Information Society of the Republic of Herzegovina, Depto. de Estructura de la Materia, Física Térmica y Electrónica, Fac. de Ciencias Físicas, TRUE, pub

Published
2020

16. The virtual atomic and molecular data centre (VAMDC) consortium

Author

Dubernet, M. L., Antony, B. K., Ba, Y. A., Babikov, Yu L., Bartschat, K., Boudon, V., Braams, B. J., Chung, H-K, Daniel, F., Delahaye, F., Del Zanna, G., de Urquijo, J., Dimitrijevic, M. S., Domaracka, A., Doronin, M., Drouin, B. J., Endres, C. P., Fazliev, A. Z., Gagarin, S. V., Gordon, I. E., Gratier, P., Heiter, Ulrike, Hill, C., Jevremovic, D., Joblin, C., Kasprzak, A., Krishnakumar, E., Leto, G., Loboda, P. A., Louge, T., Maclot, S., Marinkovic, B. P., Markwick, A., Marquart, Thomas, Mason, H. E., Mason, N. J., Mendoza, C., Mihajlov, A. A., Millar, T. J., Moreau, N., Mulas, G., Pakhomov, Yu, Palmeri, P., Pancheshnyi, S., Perevalov, V. I., Piskunov, Nikolai, Postler, J., Quinet, P., Quintas-Sanchez, E., Ralchenko, Yu, Rhee, Y-J, Rixon, G., Rothman, L. S., Roueff, E., Ryabchikova, T., Sahal-Brechot, S., Scheier, P., Schlemmer, S., Schmitt, B., Stempels, Eric H. C., Tashkun, S., Tennyson, J., Tyuterev, Vl G., Vujcic, V., Wakelam, V., Walton, N. A., Zatsarinny, O., Zeippen, C. J., Zwoelf, C. M., Dubernet, M. L., Antony, B. K., Ba, Y. A., Babikov, Yu L., Bartschat, K., Boudon, V., Braams, B. J., Chung, H-K, Daniel, F., Delahaye, F., Del Zanna, G., de Urquijo, J., Dimitrijevic, M. S., Domaracka, A., Doronin, M., Drouin, B. J., Endres, C. P., Fazliev, A. Z., Gagarin, S. V., Gordon, I. E., Gratier, P., Heiter, Ulrike, Hill, C., Jevremovic, D., Joblin, C., Kasprzak, A., Krishnakumar, E., Leto, G., Loboda, P. A., Louge, T., Maclot, S., Marinkovic, B. P., Markwick, A., Marquart, Thomas, Mason, H. E., Mason, N. J., Mendoza, C., Mihajlov, A. A., Millar, T. J., Moreau, N., Mulas, G., Pakhomov, Yu, Palmeri, P., Pancheshnyi, S., Perevalov, V. I., Piskunov, Nikolai, Postler, J., Quinet, P., Quintas-Sanchez, E., Ralchenko, Yu, Rhee, Y-J, Rixon, G., Rothman, L. S., Roueff, E., Ryabchikova, T., Sahal-Brechot, S., Scheier, P., Schlemmer, S., Schmitt, B., Stempels, Eric H. C., Tashkun, S., Tennyson, J., Tyuterev, Vl G., Vujcic, V., Wakelam, V., Walton, N. A., Zatsarinny, O., Zeippen, C. J., and Zwoelf, C. M.

Abstract

The Virtual Atomic and Molecular Data Centre (VAMDC) Consortium is a worldwide consortium which federates atomic and molecular databases through an e-science infrastructure and an organisation to support this activity. About 90% of the inter-connected databases handle data that are used for the interpretation of astronomical spectra and for modelling in many fields of astrophysics. Recently the VAMDC Consortium has connected databases from the radiation damage and the plasma communities, as well as promoting the publication of data from Indian institutes. This paper describes how the VAMDC Consortium is organised for the optimal distribution of atomic and molecular data for scientific research. It is noted that the VAMDC Consortium strongly advocates that authors of research papers using data cite the original experimental and theoretical papers as well as the relevant databases.

Published
2016
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17. Luminescence thermometry using Gd2Zr2O7:Eu3+.

Author

Nikolic, M. G., Rabasovic, M. S., Krizan, J., Savic-Sevic, S., Rabasovic, M. D., Marinkovic, B. P., Vlasic, A., and Sevic, D.

Subjects
ZIRCONIUM oxide, LUMINESCENCE spectroscopy, THERMOMETRY, EFFECT of temperature on metals, PHOTOLUMINESCENCE
Abstract

In this paper we study the possibility of using the synthesized nanopowder samples of Gd2Zr2O7:Eu3+ for temperature measurements by analyzing the temperature effects on its photoluminescence. The nanopowder was prepared by solution combustion synthesis method. The photoluminescence spectra used for analysis of Gd2Zr2O7:Eu3+ nano phosphor optical emission temperature dependence were acquired using continuous laser diode excitation at 405 nm. The temperature dependencies of line emission intensities of transitions from 5D0 and 5D1 energy levels to the ground state were analyzed. Based on this analysis we use the two lines intensity ratio method for temperature sensing. Our results show that the synthesized material can be efficiently used as thermographic phosphor up to 650 K. [ABSTRACT FROM AUTHOR]

Published
2018
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18. Orange-Reddish Light Emitting Phosphor GdVO4:Sm3+ Prepared by Solution Combustion Synthesis

Author

S. Rabasovic, M., Krizan, J., Savic-Sevic, S., Mitric, M., D. Rabasovic, M., P. Marinkovic, B., and Sevic, D.

Abstract

The gadolinium vanadate doped with samarium (GdVO4:Sm3+) nanopowder was prepared by the solution combustion synthesis (SCS) method. After synthesis, in order to achieve the full crystallinity, the material was annealed in air atmosphere at 900°C. Phase identification in the postannealed powder samples was performed by X-ray diffraction, and morphology was investigated by high-resolution scanning electron microscopy (SEM). Photoluminescence characterization of the emission spectrum and time-resolved analysis have been performed using the tunable laser optical parametric oscillator excitation and the streak camera. Several strong emission bands in the Sm3+ emission spectrum were observed, located at 567 nm (4G5/2–6H5/2), 604 nm (4G5/2–6H7/2), and 646 (654) nm (4G5/2–6H9/2), respectively. The weak emission bands at 533 nm (4F3/2–6H5/2) and 706 nm (4G5/2–6H11/2) and a weak broad luminescence emission band of VO43− were also observed by the detection system. We analyzed the possibility of using the host luminescence for two-color temperature sensing. The proposed method is improved by introducing the temporal dependence in the line intensity ratio measurements.

Published
2018
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19. Electron-impact excitation of silver.

Author

Tošić, S. D., Pejčev, V., Šević, D., McEachran, R. P., Stauffer, A. D., and Marinkovic, B. P.

Subjects
*ELECTRON impact ionization, *DIFFERENTIAL cross sections, *FINE-structure constant, *GROUND state (Quantum mechanics), *APPROXIMATION theory
Abstract

We measure the differential cross sections (DCSs) for the electron-impact excitation of the combined (two fine-structure levels) resonant 4d105p ²P1/2,3/2 and 4d95s² ²D5/2 states in silver from the 4d105p ²S1/2 ground state. A comparison with the predictions of the relativistic distorted-wave (RDW) approximation model is carried out. Relativistic distorted-wave calculations are performed for each level separately and are combined to compare with the measurements. Both the experimental and theoretical results are obtained at incident electron energies E0 of 10, 20, 40, 60, 80, and 100 eV and scattering angles 9 from 10° up to 150° (experiment) and from 0° to 180° (calculations). Absolute values for the experimental DCSs are obtained by normalizing relative DCSs to theoretical RDW results at 40° at all energies except at 10 eV, where we performed the normalization of the relative DCSs at 10° to our previous small-angle experimental DCS values [S. D. Tošić et al, Nucl. Instrum. Methods Phys. Res. Sect. B 279,53 (2012)]. The integrated cross sections, which include integral Q1, momentum transfer (QM, and viscosity Qv cross sections, are determined by numerical integration of the absolute DCSs. [ABSTRACT FROM AUTHOR]

Published
2015
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