Instrumentation and Methods for Astrophysics · arXiv:1607.02487 v1 · submitted 8 Jul 2016
Scaling of collision strengths for highly-excited states of ions of the H- and He-like sequences
The paper says
“We provide analytic formulae to calculate the electron-impact excitation collision strengths and effective collision strengths to highly-excited states (n >= 8) of H- and He-like ions.”
from the abstract · picked out as the main claim by a classifier
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The paper
Abstract
Emission lines from highly-excited states (n >= 5) of H- and He-like ions have been detected in astrophysical sources and fusion plasmas. For such excited states, R-matrix or distorted wave calculations for electron-impact excitation are very limited, due to the large size of the atomic basis set needed to describe them. Calculations for n >= 6 are also not generally available. We study the behaviour of the electron-impact excitation collision strengths and effective collision strengths for the most important transitions used to model electron collision dominated astrophysical plasmas, solar, for example. We investigate the dependence on the relevant parameters: the principal quantum number n or the nuclear charge Z. We also estimate the importance of coupling to highly-excited states and the continuum by comparing the results of different sized calculations. We provide analytic formulae to calculate the electron-impact excitation collision strengths and effective collision strengths to highly-excited states (n >= 8) of H- and He-like ions. These extrapolated effective collision strengths can be used to interpret astrophysical and fusion plasma via collisional-radiative modelling.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 1.00
What the abstract itself states, as probabilities: claims first 0.06 · states limitation 0.47 · human participants 0.01 · controlled comparison 0.11 · randomized assignment 0.01 · states quantitative result 0.22 · compares with prior results 0.70 · mentions code or data availability 0.06
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v1). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| Emission lines from highly-excited states (n >= 5) of H- and He-like ions have been detected in astrophysical sources and fusion plasmas. | background 1.00 | 0.09 | 0.02 | asserted 1.00 |
| For such excited states, R-matrix or distorted wave calculations for electron-impact excitation are very limited, due to the large size of the atomic basis set needed to describe them. | gap 0.80 | 0.07 | 0.02 | asserted 1.00 |
| Calculations for n >= 6 are also not generally available. | gap 0.93 | 0.05 | 0.02 | asserted 0.99 |
| We study the behaviour of the electron-impact excitation collision strengths and effective collision strengths for the most important transitions used to model electron collision dominated astrophysical plasmas, solar, for example. | contribution 1.00 | 0.81 | 0.06 | asserted 0.93 |
| We investigate the dependence on the relevant parameters: the principal quantum number n or the nuclear charge Z. | contribution 0.88 | 0.82 | 0.04 | asserted 0.78 |
| We also estimate the importance of coupling to highly-excited states and the continuum by comparing the results of different sized calculations. | method 0.75 | 0.94 | 0.05 | asserted 0.87 |
| We provide analytic formulae to calculate the electron-impact excitation collision strengths and effective collision strengths to highly-excited states (n >= 8) of H- and He-like ions. | contribution 0.79 | 0.96 | 0.69 | asserted 1.00 |
| These extrapolated effective collision strengths can be used to interpret astrophysical and fusion plasma via collisional-radiative modelling. | interpretation 0.87 | 0.47 | 0.31 | asserted 0.67 |
What kind of paper the classifier reports this is: theoretical result 0.60 · evidence from simulation or computation 0.98
What was examined, and what was not
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- arXiv listing abstract v1
Not examined
- full text
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- P abstract
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- S sections
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- R cross-paper relations
How the labels were made
Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 6,269 input tokens.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 1 Pith paper
Reviewed papers on Pith that cite this one. The full citation record
- Improving Helium Abundance Determinations with Leo P as a Case Study astro-ph.CO · Oct 2020
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