TITLE

Electron impact excitation rates for transitions in Mg V

AUTHOR(S)
Aggarwal, Kanti M.; Keenan, Francis P.
PUB. DATE
January 2017
SOURCE
Canadian Journal of Physics;Jan2017, Vol. 95 Issue 1, p9
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Energy levels, radiative rates ( A-values), and lifetimes, calculated with the GRASP code, are reported for an astrophysically important O-like ion, Mg V. Results are presented for transitions among the lowest 86 levels belonging to the 2s22p4, 2s2p5, 2p6, and 2s22p33 configurations. There is satisfactory agreement with earlier data for most levels and transitions, but scope remains for improvement. Collision strengths are also calculated, with the DARC code, and the results obtained are comparable for most transitions (at energies above thresholds) with earlier work using the DW code. In the threshold region, resonances have been resolved in a fine energy mesh to determine values of effective collision strengths (Î¥) as accurately as possible. Results are reported for all transitions at temperatures up to 106 K, which should be sufficient for most astrophysical applications. However, a comparison with earlier data reveals discrepancies of up to two orders of magnitude for over 60% of transitions, at all temperatures. The reasons for these discrepancies are discussed in detail.
ACCESSION #
120530339

 

Related Articles

  • Relativistic Energy Levels and Transition Probabilities for the Al-Like Ions (Z = 33- 35). Younis, W. O.; Allam, S. H. // International Review of Physics;Oct2011, Vol. 5 Issue 5, p207 

    Energy levels and transition probabilities for transitions between computed levels are reported for the Al-like ions (Z = 33-35). The results have been calculated using the multiconfiguration Hartree--Fock (MCHF) method with Breit--Pauli relativistic correction (C.F.Fischer's ATSP computer...

  • Evolution of the giant dipole resonance properties with excitation energy. Santonocito, D.; Blumenfeld, Y. // European Physical Journal A -- Hadrons & Nuclei;Oct2006, Vol. 30 Issue 1, p183 

    The studies of the evolution of the hot Giant Dipole Resonance (GDR) properties as a function of excitation energy are reviewed. The discussion will mainly focus on the A ∼ 100-120 mass region where a large amount of data concerning the width and the strength evolution with excitation...

  • Low-Frequency Periodic Processes in Spectroscopy and Chemical Transformations. Gribov, L. A.; Baranov, V. I. // Journal of Applied Spectroscopy;May2005, Vol. 72 Issue 3, p344 

    It has been shown that the low-frequency periodic processes in spectroscopy and chemical transformations that proceed without a change in the total energy of a complex molecular system can be explained as a result of synchronized radiationless transitions between the resonant ground states of...

  • Influence of the surface interaction on threshold values in the cholesteric-nematic phase transition. van Sprang, H. A.; van de Venne, J. L. M. // Journal of Applied Physics;1/15/1985, Vol. 57 Issue 2, p175 

    Deals with a study that described the threshold values for the field-induced cholesteric to nematic phase transition as crossover points of the free energy levels of the textures concerned. Calculation of the surface interaction energy; Status of a helical liquid-crystal configuration under the...

  • Ab initio molecular orbital prediction of the Renner–Teller effect for the first excited state [sup 2]∏ of MgNC: Reinterpretation of the laser-induced fluorescence spectrum based on the predicted spectroscopic constants. Odaka, Tina Erica; Taketsugu, Tetsuya; Hirano, Tsuneo; Nagashima, Umpei // Journal of Chemical Physics;7/15/2001, Vol. 115 Issue 3 

    Spectroscopic constants of the first excited state A˜ [sup 2]∏ of MgNC have been predicted from three-dimensional potential energy surfaces determined by ab initio molecular orbital calculations at the multi-reference singles and doubles configuration interaction level. The equilibrium...

  • Classical Radiative-Collisional Kinetics of Rydberg Atomic States. Levashova, M. G.; Lisitsa, V. S. // AIP Conference Proceedings;2006, Vol. 874 Issue 1, p145 

    The results of numerical modeling of the steady-state classical radiative-collisional kinetics for photorecombination are presented. The calculations are performed for edge tokamak (Ne ∼ 1011 – 1014 cm-3, Te ∼ 1–100 eV) and astrophysical plasmas (Ne ∼ 104 cm-3, Te...

  • Relativistic many-body calculations of atomic properties in Pd-like ions. Safronova, U. I.; Bista, R.; Bruch, R.; Merabet, H. // Canadian Journal of Physics;Jan2008, Vol. 86 Issue 1, p131 

    Wavelengths, transition rates, and line strengths are calculated for the 85 possible multipole transitions between the excited 4p6 4d9 4f, 4p6 4d9 5l, 4p5 4d10 4f, and 4p5 4d10 5l states and the ground 4p6 4d10 state in Pd-like ions with the nuclear charges ranging from Z = 47 to 100....

  • Recombination Mechanism of the Spin-Galvanic Effect. Grachev, A. I. // Physics of the Solid State;Nov2004, Vol. 46 Issue 11, p2008 

    The mechanism responsible for the spin-galvanic effect is considered. According to this mechanism, the current is generated as a result of the difference between the rates of spontaneous radiative transitions of charge carriers with oppositely directed spins. This difference arises when a...

  • Finite nuclear size correction to vacuum polarization in hydrogen-like ions. Bondarev, A.; Kozhedub, Yu.; Oreshkina, N. // Optics & Spectroscopy;Dec2010, Vol. 109 Issue 6, p823 

    The finite nuclear size corrections to the Dirac binding energy of an electron and to the vacuum polarization in hydrogen-like ions are considered. These corrections were calculated for the 1 s, 2 s, 2 p, and 2 p states in a wide range of the nuclear charge Z = 1-100. The results obtained are...

  • Extension of the sum rule for the transition rates between multiplets to the multiphoton case. Solovyev, D.; Labzowsky, L.; Volotka, A.; Plunien, G. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Jan2011, Vol. 61 Issue 2, p297 

    The sum rule for the transition rates between the components of two multiplets, known for the one-photon transitions, is extended to the multiphoton transitions in hydrogen and hydrogen-like ions. As an example the transitions 3p- 2p, 4p- 3p and 4d- 3d are considered. The numerical results are...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics