Full spectroscopic model and trihybrid experimental-perturbative-variational line list for CN

Syme, Anna-Maree; McKemmish, Laura K.

doi:10.1093/mnras/stab1551

Cited by 35 publications

(12 citation statements)

References 119 publications

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“…However, Gaussian profiles are usually selected in the NMT program for modeling of the spectrometer & detector transfer function. One of the primary interests is the use of updated ExoMol sets of line strength data that appear to be in use for extragalactic studies [31]. Availability of an extensive line list obviously would alleviate computation of specific transitions that are investigated in laser-plasma laboratory experiments, including CN B-X violet and CN A-X red systems.…”

Section: Resultsmentioning

confidence: 99%

“…The construction of the communicated molecular CN line strengths "CNv-lsf" [20] first, makes use of Wigner-Witmer eigenfunctions and a diatomic line position fitting program, second, computes Frank-Condon factors and r-centroids, and third, combines these factors with the rotational factors that usually decouple from the overall molecular line-strength due to the symmetry of diatomic molecules. In turn, the ExoMol states and transition files for CN [4,30,31] and the PGOPHER data file [32] are examined in order to generate line strength data that can be used with BESP and NMT. The LIFBASE program is utilized for visual comparisons of CN B-X simulated and recorded data.…”

Section: Line Positions and Strengths Of Diatomic Spectramentioning

confidence: 99%

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Cyanide Molecular Laser-Induced Breakdown Spectroscopy with Current Databases

Parigger¹

2023

Preprint

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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+⟶X2Σ+, Δv=0 sequence. Of interest are recent predictions using an astrophysical database, i.e., ExoMol, a laser-induced fluorescence database, i.e., LIFBASE, and a program for simulating rotational, vibrational and electronic spectra, i.e., PGOPHER. Cyanide spectra that are predicted from these databases are compared with line strength data that are in use by the author for the last three decades in the analysis of laser-plasma emission spectra. Comparisons with experimental laser-plasma records are communicated as well, and for spectral resolutions of 33 and 110 picometer. The accuracy of the CN line strength data is better than one picometer. Laboratory experiments utilize 308-nm, 35-picosecond bursts within an overall 1-nanosecond pulse-width, and 1064-nm, 6-ns pulse-width radiation. Experimental results are compared with predictions. Differences of the databases are elaborated for equilibrium of rotational and vibrational modes and at an internal, molecular temperature of the order of 8,000 Kelvin. Applications of accurate CN data include for example combustion diagnosis, chemistry, and supersonic and hypersonic expansion diagnosis. The cyanide molecule is also of interest in the study of astrophysical phenomena.

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Section: Resultsmentioning

confidence: 99%

Section: Line Positions and Strengths Of Diatomic Spectramentioning

confidence: 99%

Cyanide Molecular Laser-Induced Breakdown Spectroscopy with Current Databases

Parigger¹

2023

Preprint

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“…In addition to this we add the following molecular features: CH from Masseron et al (2014), and MgH from (Kurucz 2017). We also included the line lists provided in the Exomol project database (Tennyson et al 2016): C 2 (Yurchenko et al 2018b;McKemmish et al 2020), CN (Brooke et al 2014b;Syme & McKemmish 2021), NH (Brooke et al 2014a(Brooke et al , 2015Fernando et al 2018;Bernath 2020), OH (Brooke et al 2016;Yousefi et al 2018), SiH (Yurchenko et al 2018a), CaH (Shayesteh et al 2004;Li et al 2012;Alavi & Shayesteh 2017;Bernath 2020), andFeH (Dulick et al 2003;Bernath 2020).…”

Section: Analysis Methodologymentioning

confidence: 99%

GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II

Hayes,

Venn,

Waller

et al. 2023

ApJ

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The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at the Gemini-South telescope. In this paper, we present the first science results from the GHOST spectrograph taking during its commissioning runs. We have observed the bright metal-poor benchmark star HD 122563, along with two stars in the ultrafaint dwarf galaxy Reticulum II (Ret ii), one of which was previously identified as a candidate member, but did not have a previous detailed chemical abundance analysis. We find that this candidate (GDR3 0928) to be a bona fide member of Ret ii, and from a spectral synthesis analysis it is also revealed to be a CEMP-r star, with significant enhancements in several light elements (C, N, O, Na, Mg, and Si), in addition to featuring an r-process enhancement like many other Ret ii stars. The light-element enhancements in this star resemble the abundance patterns seen in the CEMP-no stars of other ultrafaint dwarf galaxies, and are thought to have been produced by an independent source from the r-process. These unusual abundance patterns are thought to be produced by faint supernovae, which may be produced by some of the earliest generations of stars.

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“…They remain moderate in the range 3.4 log(T /K) 3.6, which is likely due to the revision of the opacity of the CN molecule. In terms of CN, this work employs the line list of Syme & McKemmish (2021), Marigo & Aringer (2009) uses the data from Jørgensen (1997), andFerguson et al (2005) adopts the line list of Jørgensen & Larsson (1990).…”

Section: Molecular Absorptionmentioning

confidence: 99%

Low-Temperature Gas Opacities with AESOPUS 2.0

Marigo¹,

Aringer²,

Girardi³

et al. 2022

Preprint

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This work introduces new low-temperature gas opacities, in the range 3.2 log(T /K) 4.5, computed with the AESOPUS code under the assumption of thermodynamic equilibrium (Marigo & Aringer 2009). In comparison to the previous version AESOPUS 1.0, we updated and expanded molecular absorption to include 80 species, mostly using the recommended line lists currently available from the ExoMol and HITRAN databases. Furthermore, in light of a recent study, we revised the H − photodetachment cross section, added the free-free absorption of other negative ions of atoms and molecules, and updated the collision-induced absorption due to H 2 /H 2 , H 2 /H, H 2 /He, and H/He pairs. Using the new input physics, we computed tables of Rosseland mean opacities for several scaled-solar chemical compositions, including Magg et al. ( 2022)'s most recent one, as well as α-enhanced mixtures. The differences in opacity between the new AESOPUS 2.0 and the original AESOPUS 1.0 versions, as well as other sets of calculations, are discussed. The new opacities are released to the community via a dedicated web-page that includes both pre-computed tables for widely used chemical compositions, and a web-interface for calculating opacities on-the-fly for any abundance distribution.

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Full spectroscopic model and trihybrid experimental-perturbative-variational line list for CN

Cited by 35 publications

References 119 publications

Cyanide Molecular Laser-Induced Breakdown Spectroscopy with Current Databases

Cyanide Molecular Laser-Induced Breakdown Spectroscopy with Current Databases

GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II

Low-Temperature Gas Opacities with AESOPUS 2.0

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