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- W2807347788 abstract "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 forbidden PIII fine structure transition $3s^23p (^2P^o_{1/2-3/2})$ within the ground state at 17.9 $mu$m, as well as allowed UV transitions in the $3s^23p (^2P^o_{1/2,3/2}) rightarrow 3s3p^2 (^2D_{3/2,5/2}, ^2S_{1/2}, ^2P_{1/2,3/2})$ multiplets between 915-1345 $AA$. Collision strengths are computed using the Breit-Pauli R-Matrix method including the first 18 levels, and they exhibit extensive auto-ionizing resonance structures. In particular, the Maxwellian averaged effective collision strength for the FIR 17.9 $mu$m transition shows a factor 3 temperature variation broadly peaking at typical nebular temperatures. Its theoretical emissivity with solar phosphorus abundance is computed relative to H$beta$ and found to be similar to observed intensties from planetary nebulae; the abundances derived in earlier works are 3-5 times sub-solar. The results pertain to the reported paucity of phosphorus from preferred production sites in supernovae, and abundances in planetary nebulae and supernova remnants." @default.
- W2807347788 created "2018-06-13" @default.
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- W2807347788 date "2018-06-05" @default.
- W2807347788 modified "2023-09-27" @default.
- W2807347788 title "Collision strengths for FIR and UV transtions in P iii and the phosphorus abundance" @default.
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- W2807347788 doi "https://doi.org/10.1093/mnrasl/sly095" @default.
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