Dmytro Shapko

Dmytro Shapko
Czech Academy of Sciences, Institute of Thermomechanics | ÚT AV ČR · Department of Electrical Engineering and Electrophysics (D6)

Ph.D. in Plasma Physics

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8
Publications
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39
Citations

Publications

Publications (8)
Article
Full-text available
This work is motivated by many observations of nitrogen hydrides including their isotopologues in the interstellar space. We studied the formation of NH ⁺ and ND ⁺ ions in the nearly thermoneutral hydrogen abstraction reactions of N ⁺ ions with H 2 , HD, and D 2 at temperatures from 300 K down to 15 K using a variable-temperature 22-pole radio freq...
Article
A stationary afterglow apparatus with Cavity Ring-Down spectrometer was combined with electron number density measurement system to study the third-body assisted recombination of H3+ ions with electrons in neon gas at the temperature of 110 K. The measured ternary recombination rate coefficient KNe(110K)=(1.8±0.2)×10-25cm6s-1 is close to that obtai...
Article
Recombination of N2H⁺ ions with electrons was studied using a stationary afterglow with a cavity ring-down spectrometer. We probed in situ the time evolutions of number densities of different rotational and vibrational states of recombining N2H⁺ ions and determined the thermal recombination rate coefficients for N2H⁺ in the temperature range of 80–...
Article
We present studies on the thermalisation of H3⁺ ions in a cold He/Ar/H2 plasma at temperatures 30 - 70 K. We show that we are able to generate a rotationally thermalised H3⁺ ensemble with a population of rotational and nuclear spin states corresponding to a particular ion translational temperature. By varying the para-H2 fraction used in the experi...
Article
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 m...
Article
The stationary afterglow with cavity ring down spectrometer (SA-CRDS) was used to study the recombination of H3⁺, H2D⁺, HD2⁺ and D3⁺ ions with electrons in low temperature (77-300 K) plasmas in He/Ar/H2/D2 gas mixtures. By measuring effective recombination rate coefficients (αeff) in plasma with mixtures of ions and their dependences on temperature...
Article
A stationary afterglow apparatus in conjunction with a laser absorption cavity ring-down spectrometer has been employed to observe absorption lines in the P- and R-branches of the (200) ← (000) and (21¹⁰) ← (01¹⁰) vibrational bands of the N2H⁺ molecular ion as a part of an ongoing study of the electron-ion recombination of N2H⁺ in afterglow plasmas...
Article
Electron stimulated photon emission spectroscopy was used for the study of the electronic structure of Ge nanoparticles. A nanoparticle film was prepared by thermal deposition on a quartz substrate. Photon emission was stimulated by electron bombardment at energies of several hundred electron volts. Electron field emission from a W-tip was used at...

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