A theoretical study of the dissociative recombination of SH+ with electrons through the 2Π states of SH

Kashinski, D. O.; Talbi, Dahbia; Hickman, A. P.; Nallo, O. E. Di; Colboc, F.; Chakrabarti, Kalyan; Schneider, I. F.; Mezei, J. Zs.

doi:10.1063/1.4983690

Cited by 19 publications

(42 citation statements)

References 62 publications

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“…So, SH + is not severely depleted by this process but it is efficiently destroyed through dissociative recombination (DR) with electrons [18]. The results presented in this work have been obtained in the same way as presented in our previous theoretical work [19] by putting in evidence the importance of multi-(excited) core effects. In order to do so, first we took into account only the ground electronic state of the ion core and one dissociative valence state of the neutral (C1 and D1).…”

Section: Multi-core Effects On Dissociative Recombination Of Sh +supporting

confidence: 55%

Reactive collisions of electrons with H2+, HD+, BeH+, BeD+ and SH+

Pop

Iacob

Mezei

et al. 2017

AIP Conference Proceedings

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A theoretical study of the dissociative recombination of SH + with electrons through the 2 Π states of SH The Journal of Chemical Physics 146, 204109 (2017) Abstract. In numerous cold ionized gases the dissociative recombination (DR), the elastic collisions (EC), the vibrational excitation (VE) (inelastic collisions) and the vibrational de-excitation (VdE) (super-elastic collisions) of molecular cations with electrons are major elementary processes. Using a stepwise method based on the Multichannel Quantum Defect Theory (MQDT), cross sections and rate coefficients have been obtained for reactions induced on HD + , H 2 + , BeH + , BeD + and SH + . Moreover, the relative importance of the different reaction mechanisms, direct vs. indirect and rotational vs. non-rotational, have been studied for these molecular systems.

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Section: Multi-core Effects On Dissociative Recombination Of Sh +supporting

confidence: 55%

Reactive collisions of electrons with H2+, HD+, BeH+, BeD+ and SH+

Pop

Iacob

Mezei

et al. 2017

AIP Conference Proceedings

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“…This is probably connected with the fast recombination reactions of the (molecular) ions created after the pulse onset. It is a known fact that the rate of recombination is (almost) inversely proportionally dependent on the electron temperature, see e.g., Figure 9 in [52] showing the rate of recombination of SH + with electrons on the electron energy. The process of recombination then depletes the lower-energetic part of EEDF resulting in a higher T eff .…”

Section: Resultsmentioning

confidence: 99%

Plasma Diagnostics in Reactive High-Power Impulse Magnetron Sputtering System Working in Ar + H2S Gas Mixture

et al. 2020

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A reactive high-power impulse magnetron sputtering system (HiPIMS) working in Ar + H 2 S gas mixture was investigated as a source for the deposition of iron sulfide thin films. As a sputtering material, a pure Fe target was used. Plasma parameters in this system were investigated by a time-resolved Langmuir probe, radio-frequency (RF) ion flux probe, quartz crystal monitor modified for measurement of the ionized fraction of depositing particles, and by optical emission spectroscopy. A wide range of mass flow rates of reactive gas H 2 S was used for the investigation of the deposition process. It was found that the deposition rate of iron sulfide thin films is not influenced by the flow rate of H 2 S reactive gas fed into the magnetron discharge although the target is covered by iron sulfide compound. The ionized fraction of depositing particles decreases from r ≈ 40% to r ≈ 20% as the flow rate of H 2 S, Q H 2 S , changes from 0 to 19 sccm at the gas pressure around p ≈ 1 Pa in the reactor chamber. The electron concentration n e measured by the Langmuir probe at the position of the substrate decreases over this change of Q H 2 S from 10 18 down to 10 17 m −3Coatings 2020, 10, 246 2 of 16 realized. Furthermore, FeS films were found to be excellent low-friction materials working like solid state lubricants in tribological applications [16].High-power impulse magnetron sputtering system (HiPIMS) is a relatively novel approach for the deposition of thin films [17][18][19][20]. This method utilizes very high discharge current densities during the pulse j D > 1 A cm −2 , but, simultaneously, average power applied in the HiPIMS discharge is similar to DC magnetron sputtering. These conditions result in a high degree of ionization of sputtered particles. Thus, the deposited films have higher density, better adhesion, and 3D objects such as trenches, etc. and can be more uniformly coated as well [21][22][23]. Recently, reactive HiPIMS in various gas mixtures has been used for the deposition of oxides, nitrides, and other materials [24][25][26][27][28][29][30][31].In this paper, we will present the first study of plasma parameters in the reactive HiPIMS in Ar + H 2 S gas mixture whose results could be further used for the optimization of deposition of iron sulfide thin films or other types of sulfides. ExperimentalThe experimental setup of the reactive HiPIMS in Ar + H 2 S gas mixture can be seen in Figure 1. The system is equipped with a pure iron Fe target with an outer diameter of 50 mm and a thickness of 0.8 mm. The stainless-steel reactor vacuum chamber is continuously pumped by a combination of turbomolecular (pumping speed S t = 250 L·s −1 ) and rotary vane pumps (pumping speed S r = 25 m 3 h −1 ). The gas flow rates of Ar (99.9999%) and pure H 2 S (99.5%) are independently controlled by two mass flow controllers. It is useful to note that H 2 S is an inflammable and highly toxic gas. Consequently, the use of H 2 S in a laboratory is subject to approval by a respective official body. The pressure in the reactor cham...

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“…Among these are Rmatrix theory, 17 the complex Kohn variational method, 18 the quantum defect methods, 19 the interpretation of of spectroscopic data, 20 and the block diagonalization method. 21, 22 3.1. MQDT Calculations.…”

Section: Application To Carbon-based Diatomic Molecular Systemsmentioning

confidence: 99%

Electron-Induced Excitation, Recombination, and Dissociation of Molecular Ions Initiating the Formation of Complex Organic Molecules

Mezei

Chakrabarti²,

Epée

et al. 2019

ACS Earth Space Chem.

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We review the study of dissociative recombination and rovibrational excitation of diatomic and small polyatomic molecular ions initiating complex organic molecules formation. In particular, we show how multichannel quantum defect theory (MQDT) and R-matrix methods are used to compute cross-sections and rate coefficients for cations in well-defined rovibrational levels of the ground electronic state, from sub-meV up to a few eV collision energies. The most recent MQDT results are compared either with other theoretical data or with measured data obtained in storage-ring experiments.

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A theoretical study of the dissociative recombination of SH+ with electrons through the 2Π states of SH

Cited by 19 publications

References 62 publications

Reactive collisions of electrons with H2+, HD+, BeH+, BeD+ and SH+

Reactive collisions of electrons with H2+, HD+, BeH+, BeD+ and SH+

Plasma Diagnostics in Reactive High-Power Impulse Magnetron Sputtering System Working in Ar + H2S Gas Mixture

Electron-Induced Excitation, Recombination, and Dissociation of Molecular Ions Initiating the Formation of Complex Organic Molecules

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