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Experimental study of the dissociative recombination of molecular ions at temperatures relevant to cold interstellar plasma (30 - 300 K)
Shapko, Dmytro ; Glosík, Juraj (advisor) ; Korolov, Ihor (referee) ; Poterya, Viktoriya (referee)
TITLE: Experimental Study of the Dissociative Recombination of Molecular Ions at Temperatures Relevant to Cold Interstellar Plasma (30 - 300 K) AUTHOR: Mgr. Dmytro Shapko DEPARTMENT: Department of Surface and Plasma Science SUPERVISOR: prof. RNDr. Juraj Glosík, DrSc. ABSTRACT: The dissociative recombination process of N2H+ ions with electrons was investigated using a stationary afterglow combined with a Cavity Ring-Down Spectrometer. We conducted real-time observations of the changes over time in the population densities of various rotational and vibrational states of recombining N2H+ ions. Based on these observations, we determined the rate coefficients for thermal recombination of N2H+ within a temperature range of 80 - 350 K. By employing newly calculated vibrational transition moments of N2H+ , we provided an explanation for the discrepancies observed in previous studies regarding the recombination rate coefficients. Furthermore, our findings indicate that the measured recombination rate coefficient does not exhibit a statistically significant correlation with the number density of the buffer gas. We also conducted a study on the dissociative recombination of H3 + ions with electrons in neon gas at a temperature of 110 K. To perform this investigation, we utilized a new Cryogenic Stationary...
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Recombination of ions in plasma at 50-300 K
Rubovič, Peter ; Glosík, Juraj (advisor) ; Fárník, Michal (referee) ; Korolov, Ihor (referee)
A B S T R A C T Title: Recombination of Ions in Plasma at 50 − 300 K Author: Peter Rubovič Supervisor: Prof. RNDr. Juraj Glosík, DrSc. Abstract: Main part of this doctoral thesis lies in a study of recom- bination of atomic and molecular ions in low temperature plasmatic environment with emphasis on effect of third bodies. Stationary After- glow equipped with Cavity Ring Down Spectrometer and Cryogenic Flowing Afterglow with Langmuir Probe II were used to obtain recom- bination rate coefficients. Electron assisted collisional radiative recom- bination of Ar+ ion was studied in the temperature range of 50−100 K and helium assisted collisional radiative recombination was observed too. Both H+ 3 and its isotopologue D+ 3 were studies in flowing after- glow and spectroscopically in stationary afterglow as well. Binary re- combination rate coefficients and ternary recombination rate coeffi- cients for helium assisted ternary recombination were determined in the temperature range of 50 − 250 K. These coefficients were deter- mined also for pure ortho- and para- nuclear spin configurations of H+ 3 in the temperature range of 80 − 200 K. Keywords: dissociative recombination, collisional radiative recombi- nation, H+ 3 , D+ 3 , Ar+ viii
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Recombination of ions in plasma at 50-300 K
Rubovič, Peter ; Glosík, Juraj (advisor) ; Fárník, Michal (referee) ; Korolov, Ihor (referee)
A B S T R A C T Title: Recombination of Ions in Plasma at 50 − 300 K Author: Peter Rubovič Supervisor: Prof. RNDr. Juraj Glosík, DrSc. Abstract: Main part of this doctoral thesis lies in a study of recom- bination of atomic and molecular ions in low temperature plasmatic environment with emphasis on effect of third bodies. Stationary After- glow equipped with Cavity Ring Down Spectrometer and Cryogenic Flowing Afterglow with Langmuir Probe II were used to obtain recom- bination rate coefficients. Electron assisted collisional radiative recom- bination of Ar+ ion was studied in the temperature range of 50−100 K and helium assisted collisional radiative recombination was observed too. Both H+ 3 and its isotopologue D+ 3 were studies in flowing after- glow and spectroscopically in stationary afterglow as well. Binary re- combination rate coefficients and ternary recombination rate coeffi- cients for helium assisted ternary recombination were determined in the temperature range of 50 − 250 K. These coefficients were deter- mined also for pure ortho- and para- nuclear spin configurations of H+ 3 in the temperature range of 80 − 200 K. Keywords: dissociative recombination, collisional radiative recombi- nation, H+ 3 , D+ 3 , Ar+ viii
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Negative Ion Astrochemistry - a Laboratory Study
Jusko, Pavol ; Glosík, Juraj (advisor) ; Fárník, Michal (referee) ; Korolov, Ihor (referee)
A B S T R A C T Presented work focuses on experimental study of anion interaction with neutral particles at temperatures relevant for astrophysics. Anion H− , important for molecular hydrogen creation, and O− as a possible source of water are investigated. The temperature dependence of reac- tion rate coefficients from 10 to 150 K for reactions H− + H → H2 + e− and O− + H2 → H2O + e− has been determined. The energy distri- bution of electrons produced in the latter reaction at 300 K has also been acquired. These studies have been performed on two experimen- tal setups, which are presented together with the theory of operation, construction details, calibration, and supporting test measurements.
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