Polyatomic molecules, molecular ions, and radicals of astrophysical interest, i

Singh, Mohit; Chaturvedi, Jai Prakash

doi:10.1007/bf00640742

Astrophys Space Sci

1989

DOI: 10.1007/bf00640742

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Polyatomic molecules, molecular ions, and radicals of astrophysical interest, i

Mohit Singh

Jai Prakash Chaturvedi

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1991

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Cited by 2 publications

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“…Representative results for Ne are shown in the following Thus, information is available, or at least obtainable, for determination of the stopping properties of atoms, atomic ions, neutral molecules and electrons, so contribution to energy deposition by energetic hadrons in these systems can be determined. However, planetary atmospheres, deep space, and various plasmas contain polyatomic ions as well [5,[12][13][14]. .…”

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On the Need for the Mean Excitation Energies of Polyatomic Ionic Systems

Sabin¹

2015

J Phys Chem Biophys

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There are many cases where energy is deposited by fast hadrons into a gaseous target consisting of a variety of components. Examples include, but are not restricted to, planetary atmospheres [1], reactor plasmas [2,3], liquid crystals [4], and intergalactic space [5]. In all of these systems, although they differ widely in density (n), the incoming projectile will deposit energy into some mixture of atoms, molecules, their ions, and electrons.To understand the energy deposition process, one needs to know the stopping power, or energy loss of the projectile with velocity v per unit track length: -dE (v)/dx. The stopping power of a substance is frequently normalized with regard to the density and referred to as the target cross section, S (v):In the simplest case, that of Bethe stopping [1], the stopping cross section of each component i can be written:Where Z 1 is the projectile charge and Z 2 is the target electron number. The stopping power of a target containing a mixture of components is then given, according to the Bragg rule [7] as a sum of the stopping powers of the target componentsIn terms of the stopping cross sections of the components, this becomes Thus, the mean excitation energy and thus the stopping cross sections of each of the components must be known.The stopping power and mean excitation energy of the electron gas is well known [8].Similarly, stopping powers and mean excitation energies of neutral atoms [9] and some molecules [10] are also well known, from theory or experiment, or both.The mean excitation energies of target ions and molecules, as would be expected in space and some plasmas, are much lesser known. In a recent paper [11], the mean excitation energies for all ions of some small atoms have been calculated using the aug-cc-pCV5Z basis set. Representative results for Ne are shown in the following Thus, information is available, or at least obtainable, for determination of the stopping properties of atoms, atomic ions, neutral molecules and electrons, so contribution to energy deposition by energetic hadrons in these systems can be determined. However, planetary atmospheres, deep space, and various plasmas contain polyatomic ions as well [5,[12][13][14]. . Thus, in order to understand the interaction of fast hadrons in space, the mean excitation energies of such ions must be available, and calculation of them is suggested here.

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“…However, planetary atmospheres, deep space, and various plasmas contain polyatomic ions as well [5,[12][13][14]. .…”

mentioning

confidence: 99%

On the Need for the Mean Excitation Energies of Polyatomic Ionic Systems

Sabin¹

2015

J Phys Chem Biophys

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Studies on Molecules of Astrophysical Interest

Singh

Chaturvedi

1991

Publ. Astron. Soc. Aust.

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Extended abstractOur recent papers have been devoted to basic studies of diatomic and polyatomic molecules (Singh and Chaturvedi 1989 a,b,c,d; 1990a,b,c). A critical analysis of the 456 available references in literature has been made to select 135 polyatomic molecules, molecular ions and radicals containing from three to thirteen atoms of astrophysical significance. The results have been arranged in a text-cum-tabular form (Singh and Chaturvedi 1989 b,d). The compilation contains various information for each molecule, such as the spectral region, transition levels, and astrophysical objects where the respective molecules have been detected (say, comet, meteorite, Sun, planet, star, interstellar medium. Galaxy, etc.).

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Polyatomic molecules, molecular ions, and radicals of astrophysical interest, i

Cited by 2 publications

References 9 publications

On the Need for the Mean Excitation Energies of Polyatomic Ionic Systems

On the Need for the Mean Excitation Energies of Polyatomic Ionic Systems

Studies on Molecules of Astrophysical Interest

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