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Atoms, Volume 11, Issue 4

April 2023 - 13 articles

Cover Story: Herbig-Haro (HH) objects are bright, bow-shaped shock fronts produced in nebulae by high-speed jets from newly formed stars. This Hubble Space Telescope image shows the objects HH 203 and HH 204 in the Orion Nebula's active star formation region. Deep high-resolution spectra of HH 204 obtained by Méndez-Delgado et al. (2021, Astrophys. J., 918, 27) are rich in forbidden lines from iron and nickel. These spectra have recently been used by Mendoza et al. (2023, Atoms, 11, 63) to provide observational benchmarks to evaluate the accuracy of the radiative and collisional rates for singly and doubly ionized iron in nebular modeling. Iron abundance is key to determining depletion factors in dust grains' life cycle. View this paper

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Communication

1 Citations

1,790 Views

8 Pages

Shape and Satellite Studies of Highly Charged Ions X-ray Spectra Using Bayesian Methods

Martino Trassinelli

Atoms2023, 11(4), 64;https://doi.org/10.3390/atoms11040064

1 April 2023

High-accuracy spectroscopy commonly requires dedicated investigation into the choice of spectral line modelling to avoid the introduction of unwanted systematic errors. For such a kind of problem, the analysis of χ2 and likelihood are normally im...

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Feature Paper
Article

11 Citations

3,174 Views

34 Pages

Atomic Data Assessment with PyNeb: Radiative and Electron Impact Excitation Rates for [Fe ii] and [Fe iii]

Claudio Mendoza,
José E. Méndez-Delgado,
Manuel Bautista,
Jorge García-Rojas and
Christophe Morisset

Atoms2023, 11(4), 63;https://doi.org/10.3390/atoms11040063

1 April 2023

We use the PyNeb 1.1.16 Python package to evaluate the atomic datasets available for the spectral modeling of [Fe ii] and [Fe iii], which list level energies, A-values, and effective collision strengths. Most datasets are reconstructed from the sourc...

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Article

4 Citations

2,415 Views

16 Pages

Cyanide Molecular Laser-Induced Breakdown Spectroscopy with Current Databases

Christian G. Parigger

Atoms2023, 11(4), 62;https://doi.org/10.3390/atoms11040062

1 April 2023

This work discusses diatomic molecular spectroscopy of laser-induced plasma and analysis of data records, specifically signatures of cyanide, CN. Line strength data from various databases are compared for simulation of the CN, B2Σ+⟶X2&Si...

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Atoms - ISSN 2218-2004

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