Zobrazeno 1 - 10
of 13
pro vyhledávání: '"N. Nahar"'
Phosphorus abundance is crucial for DNA-based extraterrestrial life in exoplanets. Atomic data for observed spectral lines of P-ions are needed for its accurate determination. We present the first calculations for collision strengths for the forbidde
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d1d69b384590754ea2b46b2c64b8e38
A comprehensive study of high-accuracy photoionization cross sections is carried out using the relativistic Breit-Pauli R-matrix (BPRM) method for (hnu + Fe XVII --> Fe XVIII + e). Owing to its importance in high-temperature plasmas the calculations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2be9ac47641b199d5f31771813e9444
The unified method for total electron-ion recombination is extended to study the dielectronic satellite (DES) lines. These lines, formed from radiative decay of autoionizing states, are highly sensitive temperature diagnostics of astrophysical and la
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::338cfcde93a87d6a4fbc05cb556ccaca
Autor:
Justin Oelgoetz, Hong Lin Zhang, Anil K. Pradhan, Sultana N. Nahar, Maximiliano Montenegro, Christopher J. Fontes
It is shown that above the temperature of maximum abundance, recombination rates into the excited states of He-like ions that are calculated using earlier, more approximate methods differ markedly from rates obtained from recent distorted-wave and R-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::595d7f28d822cdfb7100eaf97e3c000c
We present theoretical iron emission line strengths for physical conditions typical of Active Galactic Nuclei with Broad-Line Regions. The non-local thermodynamic equilibrium (NLTE) models include a new and extensive treatment of radiative transfer i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f305577cf118f0c1d3481dc7952b514
Autor:
Sultana N. Nahar
Ar XIII is found to be unique with new features in electron-ion recombination not seen in any other ion. The ion has been studied with the unified method which provides a theoretically self-consistent set of atomic parameters for the inverse processe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::58e74c930adf325ffe561c2115a4abd4
We investigate the effect of resonances in photoionization and recombination cross sections computed using the R-matrix method. Photoionization and recombination rates derived from high-resolution cross sections for oxygen ions are compared with earl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::650c49aa2d56e007f6c990967aa621ca
Autor:
Anil K. Pradhan, Sultana N. Nahar
A unified scheme using the R-matrix method has been developed for electron-ion recombination subsuming heretofore separate treatments of radiative and dielectronic recombination (RR and DR). The ab initio coupled channel approach unifies resonant and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::73e0b86bbd81c32edc0f764889f7aae9
The K-alpha resonance complexes in oxygen ions O I - O VI are theoretically computed and resonance oscillator strengths and wavelengths are presented. The highly resolved photoionization cross sections, with relativistic fine structure, are computed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86425533284f35adb2ed96ee9f31ba2f
Autor:
Manuel A. Bautista, Sultana N. Nahar
We present the first detailed ab initio quantum mechanical calculations for total and state-specific recombination rate coefficients for e + Ni III --> Ni II. These rates are obtained using a unified treatment for total electron-ion recombination tha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10963f3b9f0be1914aaa5e8c1870f390