Modelling Phosphorus II Emission with Recombination via Upgrading and Translation of Code SPECTRA from Fortran to C++
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Date
2022-05
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The Ohio State University
Abstract
Phosphorus is a key element in DNA. As such, building accurate models of its spectroscopic emission, which is necessary for confirming its detection, could also serve an important role in the search for life in the Universe. The goal of this work is to improve current emission models of the five lowest lying, fine-structure levels of singly-ionized Phosphorus, which could theoretically be detected in exoplanetary atmospheres and star-forming nebulae. To achieve this, we translate the line emissivity ratios code SPECTRA from Fortran to C++, while also adding the process of electron-ion recombination to its modelling capabilities. We run this new code with two sets of input parameters: those present in current literature and those calculated with higher accuracy for this work. We have thus far found that the new code aligns exactly with the original when not including recombination, which demonstrates its accuracy, given the previously verified efficacy of the original. We have also found that our calculated input values and those from the literature produce significantly different results, while incorporating recombination has virtually no effect on transitions among the levels considered.
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Keywords
Spectroscopy, Atomic Physics, Modelling, Code Translation