Ábel Kálosi
Charles University in Prague
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Publication
Featured researches published by Ábel Kálosi.
Journal of Chemical Physics | 2015
Michal Hejduk; Petr Dohnal; Peter Rubovič; Ábel Kálosi; Radek Plašil; Rainer Johnsen; J. Glosík
Detailed measurements employing a combination of a cryogenic flowing afterglow with Langmuir probe (Cryo-FALP II) and a stationary afterglow with near-infrared absorption spectroscopy (SA-CRDS) show that binary electron recombination of para-H3(+) and ortho-H3(+) ions occurs with significantly different rate coefficients, (p)αbin and (o)αbin, especially at very low temperatures. The measurements cover temperatures from 60 K to 300 K. At the lowest temperature of 60 K, recombination of para-H3(+) is at least three times faster than that of ortho-H3(+) ((p)αbin=(1.8±0.4)×10(-7) cm(3) s(-1) vs. (o)αbin=(0-0 (+5))×10(-8) cm(3) s(-1)).
Review of Scientific Instruments | 2018
R. Plašil; Petr Dohnal; Ábel Kálosi; Štěpán Roučka; Dmytro Shapko; Serhiy Rednyk; Rainer Johnsen; J. Glosík
A cryogenic stationary afterglow apparatus equipped with a near-infrared cavity-ring-down-spectrometer (Cryo-SA-CRDS) for studies of electron-ion recombination processes in the plasma at temperatures 30-300 K has been designed, constructed, tested, and put into operation. The plasma is generated in a sapphire discharge tube that is contained in a microwave cavity. The cavity and the tube are attached to the second stage of the cold head of the cryocooler system, and they are inserted to an UHV chamber with mirrors for CRDS and vacuum windows on both ends of the tube. The temperature of the discharge tube can be made as low as 25 K. In initial test measurements, the discharge was ignited in He/Ar/H2 or He/H2 gas mixtures and the density of H3+ ions and their kinetic and rotational temperatures were measured during the discharge and afterglow. From the measured decrease in the ion density, during the afterglow, effective recombination rate coefficients were determined. Plasma relaxation was studied in He/Ar gas mixtures by monitoring the presence of highly excited argon atoms. The spectroscopic measurements demonstrated that the kinetic temperature of the ions is equal to the gas temperature and that it can be varied from 300 K down to 30 K.
Journal of Physics: Conference Series | 2015
Petr Dohnal; Ábel Kálosi; Artem Kovalenko; Radek Plašil; J. Glosík
Stationary afterglow with Cavity Ring Down Spectrometer was utilized to probe the number densities of H3+, H2D+, HD2+ and D3+ ions in discharge and afterglow plasma. The recombination rate coefficients for recombination of H2D+ and HD2+ ions with electrons were obtained from the time decays of overall ion number density at different fractions of [H2]/[D2].
Plasma Sources Science and Technology | 2015
J. Glosík; Petr Dohnal; Peter Rubovič; Ábel Kálosi; Radek Plašil; Štěpán Roučka; Rainer Johnsen
Physical Review A | 2014
Petr Dohnal; Peter Rubovič; Ábel Kálosi; Michal Hejduk; Radek Plašil; Rainer Johnsen; J. Glosík
European Physical Journal-applied Physics | 2016
Ábel Kálosi; Petr Dohnal; Lucie Augustovičová; Štĕpán Roučka; Radek Plašil; J. Glosík
Plasma Sources Science and Technology | 2017
Radek Plašil; Petr Dohnal; Ábel Kálosi; Štěpán Roučka; Rainer Johnsen; J. Glosík
European Physical Journal-applied Physics | 2017
J. Glosík; Petr Dohnal; Ábel Kálosi; L. Augustovičová; Dmytro Shapko; Štěpán Roučka; Radek Plašil
Physical Chemistry Chemical Physics | 2016
Petr Dohnal; Ábel Kálosi; Radek Plašil; Štěpán Roučka; Artem Kovalenko; Serhiy Rednyk; Rainer Johnsen; J. Glosík
EPJ Web of Conferences | 2015
J. Glosík; Michal Hejduk; Petr Dohnal; Peter Rubovič; Ábel Kálosi; Radek Plašil