Interaction dust–plasma in Titan's ionosphere: Feedbacks on the gas phase composition

Chatain, Audrey; Carrasco, Nathalie; Vettier, Ludovic; Guaitella, Olivier

doi:10.1016/j.icarus.2023.115502

Cited by 2 publications

(9 citation statements)

References 47 publications

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“…Increasing the pressure is therefore also a way to accelerate the processes to perform an experiment in hours or days instead of months or more. This point is further discussed in Chatain et al [9]. In addition, the ionization degree is a quantity fundamental to reproduce a similar ion chemistry.…”

Section: Electron Density and The Ionization Ratiomentioning

confidence: 90%

“…Neutral molecules and positive ions are monitored with a quadrupole MS (a Hiden analytical, electrostatic quadrupole plasma series previously used in Chatain et al [13]). The MS is connected to the reactor through a Pyrex junction of a few centimeters (see picture in appendix 1 of Chatain et al [9]). For the ion measurements, the collecting head of the MS required to be a few centimeters from the plasma, close to the grounded electrode (see the 'close' configuration in figure 1(c)).…”

Section: Analysis Of Neutral and Ionized Gas Species With Mass Spectr...mentioning

confidence: 99%

“…The H 2 percentage has as greater effect on m/z 42 and 43 (N 3 + , N 3 H + ), whereas the current has a stronger effect on m/z 44 and 45 (N 3 H 2 + /CO 2 H + and N 3 H 3 + ). We note that all the experiments presented in figure 6 have been conducted jointly with experiments for another study [9]. For this purpose, an organic sample was positioned at ∼30 cm from the plasma, to be inserted later in the plasma.…”

Section: Detection Of Positive Ionsmentioning

confidence: 99%

“…In more details, it is a dusty plasma and it includes a large number of solid organic aerosols [7]. Knowing the erosive properties of the N 2 -H 2 plasma species, some works have investigated how the N 2 -H 2 erosive component of Titan's ionospheric plasma could erode these organic aerosols [8,9]. These works use a DC glow discharge in N 2 -H 2 to mimic the erosive part of Titan's ionospheric plasma and they expose analogues of Titan's organic aerosols to the plasma species.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12].). However, none has been performed in the required experimental conditions of [9], at ∼1 mbar and low power (0.05-0.2 W cm −3 ).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a DC glow discharge in N₂–H₂with electrical measurements and neutral and ion mass spectrometry

Chatain¹,

Morillo-Candas²,

Vettier³

et al. 2023

Plasma Sources Sci. Technol.

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The addition of small amounts of H2 were investigated in a DC glow discharge in N2, at low pressure (~1 mbar) and low power (0.05 to 0.2 W.cm-3). We quantified the electric field, the electron density, the ammonia production and the formation of positive ions for amounts of H2 varying between 0 and 5%, pressure values between 0.5 and 4 mbar, and currents between 10 and 40 mA.The addition of less than 1% H2 has a strong effect on the N2 plasma discharges. Hydrogen quenches the (higher) vibrational levels of N2 and some of its highly energetic metastable states. This leads to the increase of the discharge electric field and consequently of the average electron energy. As a result, higher quantities of radical and excited species are suspected to be produced. The addition of hydrogen also leads to the formation of new species. In particular, ammonia and hydrogen-bearing ions have been observed: N2H+ and NH4+ being the major ones, and also H3+, NH+, NH2+, NH3+, N3H+ and N3H3+.The comparison to a radiofrequency capacitively coupled plasma (RF CCP) discharge in similar experimental conditions shows that both discharges led to similar observations. The study of N2-H2 discharges in the laboratory in the adequate ionization conditions then gives some insights on which plasma species made of nitrogen and hydrogen could be present in the ionosphere of Titan. Here, we identified some protonated ions, which are reactive species that could participate to the erosion of organic aerosols on Titan. 

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Section: Electron Density and The Ionization Ratiomentioning

confidence: 90%

Section: Analysis Of Neutral and Ionized Gas Species With Mass Spectr...mentioning

confidence: 99%

Section: Detection Of Positive Ionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[10][11][12].). However, none has been performed in the required experimental conditions of [9], at ∼1 mbar and low power (0.05-0.2 W cm −3 ).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization of a DC glow discharge in N₂–H₂with electrical measurements and neutral and ion mass spectrometry

Chatain¹,

Morillo-Candas²,

Vettier³

et al. 2023

Plasma Sources Sci. Technol.

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Inelastic N$$_2$$+H$$_2$$ collisions and quantum-classical rate coefficients: large datasets and machine learning predictions

et al. 2023

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Rate coefficients for vibrational energy transfer are calculated for collisions between molecular nitrogen and hydrogen in a wide range of temperature and of initial vibrational states ($$v\le 40$$ v ≤ 40 for N$$_2$$ 2 and $$w\le 10$$ w ≤ 10 for H$$_2$$ 2 ). These data are needed for the modelling of discharges in N$$_2$$ 2 /H$$_2$$ 2 plasma or of atmospheric and interstellar medium chemistry in different temperature ranges. The calculations were performed by a mixed quantum-classical method, to recover quantum effects associated with the vibrational motion, on a refined potential energy surface. The obtained rates present striking discrepancies with those evaluated by first-order perturbation theories, like the SSH (Schwartz, Slavsky, Herzfeld) theory, which are often adopted in kinetic modelling. In addition, we present a detailed, though preliminary, analysis on the performance of different Machine Learning models based on the Gaussian Process or Neural Network techniques to produce complete datasets of inelastic scattering rate coefficients. Eventually, by using the selected models, we give the complete dataset (i.e., covering the whole vibrational ladder) of rate coefficients for the $$\textrm{N}_2(v)+\textrm{H}_2(0) \longrightarrow \textrm{N}_2(v-\Delta v)+\textrm{H}_2(0)$$ N 2 ( v ) + H 2 ( 0 ) ⟶ N 2 ( v - Δ v ) + H 2 ( 0 ) , $$\Delta v=1,2,3$$ Δ v = 1 , 2 , 3 processes. Graphical abstract

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Interaction dust–plasma in Titan's ionosphere: Feedbacks on the gas phase composition

Cited by 2 publications

References 47 publications

Characterization of a DC glow discharge in N₂–H₂with electrical measurements and neutral and ion mass spectrometry

Characterization of a DC glow discharge in N₂–H₂with electrical measurements and neutral and ion mass spectrometry

Inelastic N$$_2$$+H$$_2$$ collisions and quantum-classical rate coefficients: large datasets and machine learning predictions

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Interaction dust–plasma in Titan's ionosphere: Feedbacks on the gas phase composition

Cited by 2 publications

References 47 publications

Characterization of a DC glow discharge in N2–H2with electrical measurements and neutral and ion mass spectrometry

Characterization of a DC glow discharge in N2–H2with electrical measurements and neutral and ion mass spectrometry

Inelastic N$$_2$$+H$$_2$$ collisions and quantum-classical rate coefficients: large datasets and machine learning predictions

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Product

Resources

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Characterization of a DC glow discharge in N₂–H₂with electrical measurements and neutral and ion mass spectrometry

Characterization of a DC glow discharge in N₂–H₂with electrical measurements and neutral and ion mass spectrometry