Relativistic calculations of radiative properties and fine structure constant varying sensitivity coefficients in the astrophysically relevant Zn II, Si IV and Ti IV ions

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dc.contributor.author Nandy, Dillip Kumar
dc.contributor.author Sahoo, B. K.
dc.date.accessioned 2015-02-12T16:25:07Z
dc.date.available 2015-02-12T16:25:07Z
dc.date.issued 2015-01
dc.identifier.citation Nandy, D.K. and Sahoo, B.K., “Relativistic calculations of radiative properties and fine structure constant varying sensitivity coefficients in the astrophysically relevant Zn II, Si IV and Ti IV ions”, Monthly Notices of the Royal Astronomical Society, DOI: 10.1093/mnras/stu2707, vol. 447, no. 4, pp. 3812-3823, Jan. 2015. en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://dx.doi.org/10.1093/mnras/stu2707
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/1628
dc.description.abstract We have carried out calculations of the relativistic sensitivity coefficients, oscillator strengths, transition probabilities, lifetimes and magnetic dipole hyperfine structure constants for a number of low-lying states in the Zn ii, Si iv and Ti iv ions which are abundant in the distant quasars and various stellar plasmas. These spectroscopic data will be very useful for probing temporal variation of the fine structure constant (αe) and in the diagnostic processes of some of the astrophysical plasmas. We have employed all-order perturbative methods in the relativistic coupled-cluster framework using the Dirac–Coulomb Hamiltonian to calculate the atomic wavefunctions of the considered ions. Reference states are constructed with the VN−1 and VN+1 potentials and then the electron–electron correlation effects are taken into account by constructing all possible singly and doubly excited configurations, involving both the core and valence electrons, from the respective reference states. We have also determined one electron affinities and ionization potentials of many excited states in these Zn ii, Si iv and Ti iv ions. Except for a few states we have attained accuracies within 1 per cent for the energies compared with their experimental values. Our calculated sensitivity coefficients are estimated to have similar accuracies as of the calculated energies. Furthermore, combining our calculated transition matrix elements with the experimental wavelengths we evaluate transition probabilities, oscillator strengths and lifetimes of some of the excited states in these ions. These results are compared with the available data in a few cases and found to be in very good agreement among themselves. Using our reported hyperfine structure constants due to the dominant magnetic dipole interaction, it is possible to determine hyperfine splittings approximately in the above considered ions. en_US
dc.description.statementofresponsibility by D.K. Nandy and B.K Sahoo
dc.format.extent vol. 447, no. 4, pp. 3812-3823
dc.language.iso en en_US
dc.publisher Oxford Journal en_US
dc.subject Atomic data en_US
dc.subject Line: profiles en_US
dc.subject Quasars: absorption lines en_US
dc.title Relativistic calculations of radiative properties and fine structure constant varying sensitivity coefficients in the astrophysically relevant Zn II, Si IV and Ti IV ions en_US
dc.type Article en_US
dc.relation.journal Monthly Notices of the Royal Astronomical Society


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