(New) molecular ions in the interstellar medium

Roueff, E.

doi:10.1051/epjconf/20158406004

Cited by 3 publications

(1 citation statement)

References 52 publications

(59 reference statements)

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“…NH + is not observed in the ISM (see for example [7,8]). However, it is likely to be present in the tail of comets [9,10] and is a precursor to the formation of ammonia in the ISM.…”

Section: Introductionmentioning

confidence: 99%

Electron impact studies on the imidogen (NH⁺) molecular ion

Ghosh¹,

Chakrabarti²,

Choudhury³

2022

Plasma Sources Sci. Technol.

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Low energy electron collision calculations have been performed on the imidogen molecular ion NH+ at its equilibrium geometry using the R-matrix method. A suitable model is first built to represent the NH+ target ion. With this target model we have performed scattering calculations to obtain cross sections for electronic excitation from the X2Π ground state of NH+ to few of its excited states. The excitation cross sections are then used to approximately obtain the cross section for dissociation for the production of N+ ions. We also report the cross sections for rotational excitation of NH+ in its ground state within the Coulomb–Born approximation.

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“…NH + is not observed in the ISM (see for example [7,8]). However, it is likely to be present in the tail of comets [9,10] and is a precursor to the formation of ammonia in the ISM.…”

Section: Introductionmentioning

confidence: 99%

Electron impact studies on the imidogen (NH⁺) molecular ion

Ghosh¹,

Chakrabarti²,

Choudhury³

2022

Plasma Sources Sci. Technol.

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Effects of collision energy and vibrational excitation of CH3+ cations on its reactivity with hydrocarbons: But-2-yne CH3CCCH3 as reagent partner

Cernuto

Lopes

Romanzin

et al. 2017

The Journal of Chemical Physics

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The methyl carbocation is ubiquitous in gaseous environments, such as planetary ionospheres, cometary comae, and the interstellar medium, as well as combustion systems and plasma setups for technological applications. Here we report on a joint experimental and theoretical study on the mechanism of the reaction CH + CHCCCH (but-2-yne, also known as dimethylacetylene), by combining guided ion beam mass spectrometry experiments with ab initio calculations of the potential energy hypersurface. Such a reaction is relevant in understanding the chemical evolution of Saturn's largest satellite, Titan. Two complementary setups have been used: in one case, methyl cations are generated via electron ionization, while in the other case, direct vacuum ultraviolet photoionization with synchrotron radiation of methyl radicals is used to study internal energy effects on the reactivity. Absolute reactive cross sections have been measured as a function of collision energy, and product branching ratios have been derived. The two most abundant products result from electron and hydride transfer, occurring via direct and barrierless mechanisms, while other channels are initiated by the electrophilic addition of the methyl cation to the triple bond of but-2-yne. Among the minor channels, special relevance is placed on the formation of CH, stemming from H loss from the addition complex. This is the only observed condensation product with the formation of new C-C bonds, and it might represent a viable pathway for the synthesis of complex organic species in astronomical environments and laboratory plasmas.

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