Search Results - "RAMSBOTTOM, C"

Collisional and radiative data for tellurium ions in kilonovae modelling and laboratory benchmarks by Mulholland, L P, McNeill, F, Sim, S A, Ballance, C P, Ramsbottom, C A

“…ABSTRACT Tellurium is a primary candidate for the identification of the 2.1 $\, \mu$m emission line in kilonovae (KNe) spectra AT2017gfo and GRB230307A…”
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R-matrix atomic data for application in astrophysics and fusion by Ramsbottom, C. A., Ballance, C. P., McCann, M.

“…A selection of electron-impact excitation R -matrix calculations completed by the collision group at Queens University Belfast are discussed. The atomic data…”
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Improved Fe ii Emission-line Models for AGNs Using New Atomic Data Sets by Sarkar, A., Ferland, G. J., Chatzikos, M., Guzmán, F., van Hoof, P. A. M., Smyth, R. T., Ramsbottom, C. A., Keenan, F. P., Ballance, C. P.

“…Abstract Understanding the Fe II emission from active galactic nuclei (AGNs) has been a grand challenge for many decades. The rewards from understanding the…”
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New radiative and collisional atomic data for Sr ii and Y ii with application to Kilonova modelling by Mulholland, L P, McElroy, N E, McNeill, F L, Sim, S A, Ballance, C P, Ramsbottom, C A

“…ABSTRACT The spectra of singly ionized Strontium and Yttrium (Sr ii and Y ii) have been proposed as identifications of certain spectral features in the…”
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Monte Carlo radiative transfer for the nebular phase of Type Ia supernovae by Shingles, L J, Sim, S A, Kromer, M, Maguire, K, Bulla, M, Collins, C, Ballance, C P, Michel, A S, Ramsbottom, C A, Röpke, F K, Seitenzahl, I R, Tyndall, N B

“…ABSTRACT We extend the range of validity of the artis 3D radiative transfer code up to hundreds of days after explosion, when Type Ia supernovae (SNe Ia) are…”
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Level-resolved Photoionization Cross Sections for Fe i by Smyth, R. T., Ballance, C. P., Ramsbottom, C. A.

“…Significant contributions to the UV opacity in the solar atmosphere have been found to stem from bound-free transitions in neutral iron. As such, accurate…”
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Electron-impact excitation of Ge iii and photoionization of Ge ii by Dunleavy, N L, Ballance, C P, Ramsbottom, C A, Jeffery, C S

“…ABSTRACT Energy levels, Einstein A-values, and oscillator strengths are calculated for doubly ionized germanium (Ge iii). We have undertaken a study of the…”
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Towards converged electron-impact excitation calculations of low-lying transitions in Fe  ii by Smyth, R T, Ramsbottom, C A, Keenan, F P, Ferland, G J, Ballance, C P

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COLLISION STRENGTHS AND EFFECTIVE COLLISION STRENGTHS FOR TRANSITIONS WITHIN THE GROUND-STATE CONFIGURATION OF S III by Hudson, C E, Ramsbottom, C A, Scott, M P

“…We have carried out a 29-state R-matrix calculation in order to calculate collision strengths and effective collision strengths for the electron impact…”
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Spectroscopic diagnostics of low-ionized iron-peak elements. Electron-impact excitation of Ni3+ and photoionization of Ni2 by Fernández-Menchero, L, Smyth, R T, Ramsbottom, C A, Ballance, C P

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Valence and L-shell photoionization of Cl-like argon using R-matrix techniques by Tyndall, N. B., Ramsbottom, C. A., Ballance, C. P., Hibbert, A.

“…Photoionization cross-sections are obtained using the relativistic Dirac Atomic R-matrix Codes (darc) for all valence and L-shell energy ranges between 27 and…”
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ELECTRON-IMPACT EXCITATION COLLISION STRENGTHS AND THEORETICAL LINE INTENSITIES FOR TRANSITIONS IN S III by Grieve, M F R, Ramsbottom, C A, Hudson, C E, Keenan, F P

“…We present Maxwellian-averaged effective collision strengths for the electron-impact excitation of S III over a wide range of electron temperatures of…”
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Electron-impact excitation of Scii: collision strengths and effective collision strengths for fine-structure transitions by Grieve, M. F. R, Ramsbottom, C. A

“…Accurate fine-structure atomic data for the Fe-peak elements are essential for interpreting astronomical spectra. There is a severe paucity of data available…”
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ELECTRON-IMPACT EXCITATION OF Ni II: EFFECTIVE COLLISION STRENGTHS FOR OPTICALLY ALLOWED FINE-STRUCTURE TRANSITIONS by CASSIDY, C. M, RAMSBOTTOM, C. A, SCOTT, M. P

“…In this paper, we present collision strengths and Maxwellian averaged effective collision strengths for the electron-impact excitation of Ni II. Attention is…”
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Charge-state distribution and doppler effect in an expanding photoionized plasma by FOORD, M. E, HEETER, R. F, JONAUSKAS, V, KISIELIUS, R, MIX, L. P, RAMSBOTTOM, C, SPRINGER, P. T, KEENAN, F. P, ROSE, S. J, GOLDSTEIN, W. H, VAN HOOF, P. A. M, THOE, R. S, BAILEY, J. E, CUNEO, M. E, CHUNG, H.-K, LIEDAHL, D. A, FOURNIER, K. B, CHANDLER, G. A

“…The charge state distributions of Fe, Na, and F are determined in a photoionized laboratory plasma using high resolution x-ray spectroscopy. Independent…”
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Electron-impact excitation of Sc II: collision strengths and effective collision strengths for fine-structure transitions by Grieve, M. F. R., Ramsbottom, C. A.

“…Abstract Accurate fine-structure atomic data for the Fe-peak elements are essential for interpreting astronomical spectra. There is a severe paucity of data…”
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Study of X-ray photoionized Fe plasma and comparisons with astrophysical modeling codes by Foord, M.E., Heeter, R.F., Chung, H.-K., van Hoof, P.A.M., Bailey, J.E., Cuneo, M.E., Liedahl, D.A., Fournier, K.B., Jonauskas, V., Kisielius, R., Ramsbottom, C., Springer, P.T., Keenan, F.P., Rose, S.J., Goldstein, W.H.

“…The charge state distributions of Fe, Na and F are determined in a photoionized laboratory plasma using high-resolution X-ray spectroscopy. Independent…”
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Auroral and nebular emission lines of [S II] in the optical spectra of planetary nebulae by Keenan, F. P., Aller, L. H., Bell, K. L., Hyung, S., McKenna, F. C., Ramsbottom, C. A.

“…R-matrix calculations of electron impact excitation rates among the 3s23p3 levels of S II are presented, which are found to be up to a factor ∼ 2 different…”
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Electron-Impact Excitation of Ge  iii and Photoionisation of Ge  ii by Dunleavy, N L, Ballance, C P, Ramsbottom, C A, Jeffery, C S

“…Abstract Energy levels, Einstein A-values and oscillator strengths are calculated for doubly-ionised germanium (Ge iii). We have undertaken a study of the…”
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Opacity modelling of heavy-metal hot subdwarfs: photoionization of Sr0, Y+, and Zr2 by Fernández-Menchero, L, Jeffery, C S, Ramsbottom, C A, Ballance, C P

“…ABSTRACT Heavy-metal hot subdwarfs (sdB and sdO) represent a small group of stars with unusually high concentrations of trans-iron elements in their…”
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