Mol-D a Database and a Web Service within the Serbian Virtual Observatory and the Virtual Atomic and Molecular Data Centre

Srećković, Vladimir A.; Jevremović, D.; Vujčić, Veljko; Ignjatović, Lj. M.; Milovanović, N.; Erkapić, Sanja; Dimitrijević, M. S.

doi:10.1017/s1743921316012643

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…State-to-state kinetic and radiative transfer models urge to have available reliable rate coefficients in order to proceed in the description of the kinetics of level populations. These input data are needed to be provided in suitable and, wherever possible, extended temperature regimes, to allow for the description of different astrophysical environments where thermal conditions might be drastically different. − …”

Section: Discussionmentioning

confidence: 99%

Rotational Excitation of HD by Hydrogen Revisited

et al. 2018

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The HD molecules are key species for the cooling of pristine gas at temperatures below 100 K. They are also known to be key tracers of H2 in protoplanetary disks and thus, they can be used as a measure of protoplanetary disks mass. Accurate modeling of the cooling mechanism and of HD abundance in astrophysical media requires a proper modeling for its excitation by both radiative and collisional processes. Here, we report quantum time-independent calculations of collisional rate coefficients for the rotational excitation of HD by H for temperatures ranging from 10 to 1000 K. The reactive and hydrogen exchange channels are taken into account in the scattering calculations. New exact quantum results are compared to previous calculations performed neglecting reactive and exchange channels. We found that for temperatures higher than ∼300 K, the impact of these channels on the rate coefficients cannot be neglected. Such results suggest that the new HD–H collisional data have to be used for properly modeling HD cooling function and HD abundance in all the astrophysical environments where HD plays a role, e.g. in photon-dominated regions, protoplanetary disks, early Universe chemistry, and primordial star forming regions.

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Section: Discussionmentioning

confidence: 99%

Rotational Excitation of HD by Hydrogen Revisited

et al. 2018

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“…We prepared data in Virtual Observatory (VO) ( ) compatible format [ 36 , 37 , 38 ] which enable further implementation of results in the A & M databases like [ 27 , 39 ] thus providing a single location where users can access atomic and molecular data. Also, in order to prepare the easier use of data in practice, we found and give for the rate coefficients a simple and accurate fitting formula as a second-degree polynomial fit to numerical results.…”

Section: Results and Discussionmentioning

confidence: 99%

Photodestruction of Diatomic Molecular Ions: Laboratory and Astrophysical Application

2020

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In this work, the processes of photodissociation of some diatomic molecular ions are investigated. The partial photodissociation cross-sections for the individual rovibrational states of the diatomic molecular ions, which involves alkali metals, as well as corresponding data on molecular species and molecular state characterizations, are calculated. Also, the average cross-section and the corresponding spectral absorption rate coefficients for those small molecules are presented in tabulated form as a function of wavelengths and temperatures. The presented results can be of interest for laboratory plasmas as well as for the research of chemistry of different stellar objects with various astrophysical plasmas.

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“…in laboratory plasmas and in planetary atmospheres (Marinković et al, 2017b,a;Srećković et al, 2017a). In order to provide a repository of such large amounts of data, the creation of a Virtual Observatory and Virtual Data Centre has been crucial (Dubernet et al, 2010Jevremović et al, 2009;Srećković et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Databases for collisional and radiative processes in small molecules needed for spectroscopy use in astrophysics

Jevremović¹,

Srećković²,

Marinković³

et al. 2020

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In this contribution we present a report on two atomic/molecular databases for collisional and radiative processes, BEAMDB and MolD, which are web services at the Serbian Virtual Observatory (SerVO) and nodes within the Virtual Atomic and Molecular Data Center (VAMDC). Within the BEAMDB there are mainly electron scattering cross section data, but having in mind the importance of spectroscopic data obtained by particle collisions, we also provide a number of electron energy loss spectra and threshold electron spectra. Electron loss spectroscopy with its complementarity to the photon absorption data, provides valuable information on the optically forbidden atomic and molecular transitions. The MolD database contains photodissociation cross sections for the individual ro-vibrational states of the diatomic molecular ions as well as corresponding data on molecular species and molecular state characterizations. The data can be used for further applications, e.g., for non-local thermal equilibrium modeling of early universe chemistry, modeling of the solar atmosphere, atmospheres of white dwarfs, etc.

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Mol-D a Database and a Web Service within the Serbian Virtual Observatory and the Virtual Atomic and Molecular Data Centre

Cited by 4 publications

References 16 publications

Rotational Excitation of HD by Hydrogen Revisited

Rotational Excitation of HD by Hydrogen Revisited

Photodestruction of Diatomic Molecular Ions: Laboratory and Astrophysical Application

Databases for collisional and radiative processes in small molecules needed for spectroscopy use in astrophysics

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