Catherine A. Ramsbottom

R-matrix collision strengths and distorted-wave recombination rates for ions of cerium

Leo Patrick Mulholland, N. Ferguson, Luke Jeremy Shingles, Catherine A. Ramsbottom et autres

This database contains calibrated collision strengths and transition probabilities for Ce 1+, 2+ and 3+. The atomic structures and transition probabilities are determined by the grasp0 (Dyall, Grant et al 1989) code. These structures are then be carried forward to the DARC …

gb, de (code pays fourni par la source)

R-matrix collision strengths and distorted-wave recombination rates for ions of cerium

Leo Patrick Mulholland, N. Ferguson, Luke Jeremy Shingles, Catherine A. Ramsbottom et autres

This database contains calibrated collision strengths and transition probabilities for Ce 1+, 2+ and 3+. The atomic structures and transition probabilities are determined by the grasp0 (Dyall, Grant et al 1989) code. These structures are then be carried forward to the DARC …

gb, de (code pays fourni par la source)

Ce II-IV emission in kilonovae with R-matrix collision strengths and distorted wave recombination rates

Leo Patrick Mulholland, N. Ferguson, Luke J. Shingles, Catherine A. Ramsbottom et autres

We provide transition probabilities and Maxwellian-averaged collision-strengths for the electron-impact excitation of Ce {\sc ii} - {\sc iv}. These ions are potentially abundant in kilonovae (KNe) and feature both forbidden and allowed transitions in the infrared. These atomic data are obtained using …

Ce II-IV emission in kilonovae with R-matrix collision strengths and distorted wave recombination rates

Leo Patrick Mulholland, N. Ferguson, Luke J. Shingles, Catherine A. Ramsbottom et autres

We provide transition probabilities and Maxwellian-averaged collision-strengths for the electron-impact excitation of Ce {\sc ii} - {\sc iv}. These ions are potentially abundant in kilonovae (KNe) and feature both forbidden and allowed transitions in the infrared. These atomic data are obtained using …

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Late-time emission-line profiles from kilonova models

Stuart A. Sim, Oliver Just, Z Xiong, A Bauswein et autres

ABSTRACT Numerical simulations suggest that neutron star mergers eject material with complex, non-spherical density and composition distributions. Here we use two-dimensional configurations of merger ejecta obtained from long-term hydrodynamic simulations to quantify the influence of such ejecta structure on the shapes of …

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Valence photoabsorption spectroscopy of Zr and Zr+ for astrophysical applications

Kirsten Dowd, Hope Dannar, Michael McCann, R Jason Jones et autres

ABSTRACT As an element produced by the nuclear r-process, zirconium is of interest in the analysis and interpretation of astrophysical spectra. The spectra of kilonovae, resulting from binary neutron star mergers, are of particular interest. Current efforts to accurately model the spectra …

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A generalized darc RMPS approach for the electron-impact ionization and excitation of C i from ground and excited states

David J Dougan, C P Ballance, Catherine A. Ramsbottom, Stuart D. Loch

The modeling and spectral interpretation of carbon impurities in laboratory fusion plasmas requires accurate electron-impact ionization and excitation data. The rate of ionization is often dominated by ionization from excited states, with low charge states of carbon also requiring non-perturbative quantum mechanical …

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Electron impact excitation of Te iv and v and level resolved R-matrix photoionization of Te i–iv with application to modelling of AT2017gfo

Leo Patrick Mulholland, Catherine A. Ramsbottom, C P Ballance, Albert Sneppen et autres

ABSTRACT Spectral modelling of kilonovae (KNe) requires large amounts of collisional excitation and photoionization atomic data for lowly ionized (neutral, singly, and doubly ionized) species of heavy elements. Much of the data currently used is calculated using approximate hydrogenic results or adopts …

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Electron impact excitation of Te <scp>iv</scp> and <scp>v</scp> and level resolved R-matrix photoionization of Te  <scp>i–iv</scp> with application to modelling of AT2017gfo

Leo Patrick Mulholland, C A Ramsbottom, C P Ballance, Albert Sneppen et autres

ABSTRACT Spectral modelling of kilonovae (KNe) requires large amounts of collisional excitation and photoionization atomic data for lowly ionized (neutral, singly, and doubly ionized) species of heavy elements. Much of the data currently used is calculated using approximate hydrogenic results or adopts …

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New level resolved ground and excited state Pb iii, iv, v , and vi photoionization cross-sections for heavy metal subdwarf modelling

David J Dougan, M. Dorsch, Laura J. A. Scott, Niall E McElroy et autres

ABSTRACT High abundances of various lead (Pb) species have been identified in the spectra of many asymptotic giant branch stars and O- and B-type subdwarfs (sdO/B). Additional atomic data relating to Pb, and in particular photoionization cross-sections, are needed to allow a …

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Strontium i, iii, iv , and v : electron impact excitation data for Kilonovae and white dwarf diagnostic applications

David J Dougan, Niall E McElroy, C P Ballance, Catherine A. Ramsbottom

ABSTRACT Strontium (Sr) emissions have been observed across a wide range of astrophysical phenomena, from kilonovae (KNe) events to white dwarf (WD) stars. Precise and extensive atomic data for low ionization stages of Sr is required for accurate theoretical modelling and to …

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On the use of the Axelrod formula for thermal electron collisions in astrophysical modelling

Leo Patrick Mulholland, Steven Bromley, C P Ballance, Stuart A. Sim et autres

The Axelrod approximation is widely used in astrophysical modelling codes to evaluate electron-impact excitation effective collision strengths for forbidden transitions. Approximate methods such as this are a necessity for many heavy elements with open shells where collisional data is either non existent …

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