Exploring the Thermodynamic Characteristics of Isoelectronic Diatomic Interstellar Molecular Species: Oxygen and Sulfur Containing Specie
DOI:
https://doi.org/10.56919/usci.2432.016Keywords:
Interstellar medium (ISM), Atoms-ISM, Isoelectronic molecules, Laws of thermodynamics, AstrochemistryAbstract
Interstellar molecular species, particularly isoelectronic diatomic molecules, exhibit distinct thermodynamic traits, setting them apart from other molecular species. This study investigates the thermodynamic properties of isoelectronic diatomic interstellar molecular species containing oxygen and sulfur atoms, employing computational methods to analyze entropy, free energy, heat capacity, and internal energy across a spectrum of interstellar temperatures. Graphical representations highlight intriguing trends, revealing Oxygen and sulfur-containing molecules' earlier responsiveness to temperature changes compared to oxygen counterparts. Notably, molecule size emerges as a key determinant, with larger mass molecules exhibiting higher entropy, free energy, and heat capacity. We showed the isoelectronic effect of these Sulfur and Oxygen containing molecular species (OH, SN, CO, CS, SiO, SiS, FeO, FeS, PO, PS O2, OS, ZnO, ZnS, TiO, TiS) on several interstellar molecules at temperatures ranging from 
to 
(i.e., from the coldest place in the universe to the mean temperature of the interstellar medium). These findings offer valuable insights into the thermodynamic behavior of interstellar molecular species, paving the way for future research on the role of oxygen and sulfur atoms in complex molecular systems.
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