Dr Antonin Knizek: Publications

The Chemistry of CO2 and TiO2

Springer International Publishing, 2019

Authors:

Svatopluk Civiš, Martin Ferus, Antonín Knížek

HNCO-based synthesis of formamide in planetary atmospheres

Astronomy & Astrophysics EDP Sciences 616 (2018) A150-A150

Authors:

M Ferus, V Laitl, A Knizek, P Kubelík, J Sponer, J Kára, JE Sponer, B Lefloch, G Cassone, S Civiš

Abstract:

Time-resolved Fourier transform infrared emission spectroscopy, Fourier transform absorption infrared spectroscopy, and high-resolution UV–ViS emission spectroscopy have been used to characterize the chemistry of isocyanic acid (HNCO) under glow discharge conditions in planetary atmospheres. HNCO mixtures (i.e., composed of di-hydrogen or ammonia) have been investigated in order to unveil the possible reaction pathways leading to the synthesis of the key prebiotic molecule formamide (HCONH2), upon planetary atmospheres containing isocyanic acid in presence of di-hydrogen and, separately, of ammonia. In addition, ab initio molecular dynamics simulations coupled with a modern metadynamics technique have been performed in order to identify the most likely chemical pathways connecting HNCO to formamide. It turned out that the direct hydrogenation of HNCO is thermodynamically favored. Incidentally, the experimental results – supplied by a simplified kinetic model – also proved the favorability of the reaction HNCO + H2→ HCONH2which, moreover, spontaneously takes place in unbiased ab initio molecular dynamics simulations carried out under the effect of intense electric fields.

Comparative SIFT-MS, GC–MS and FTIR analysis of methane fuel produced in biogas stations and in artificial photosynthesis over acidic anatase TiO2 and montmorillonite

Journal of Molecular Spectroscopy Elsevier BV 348 (2018) 152-160

Authors:

Antonín Knížek, Ksenyia Dryahina, Patrik Španěl, Petr Kubelík, Ladislav Kavan, Markéta Zukalová, Martin Ferus, Svatopluk Civiš

Author Correction: High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth.

Scientific reports 8:1 (2018) 4266

Authors:

Martin Ferus, Petr Kubelík, Antonín Knížek, Adam Pastorek, John Sutherland, Svatopluk Civiš

Abstract:

A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.

Calibration-free quantitative elemental analysis of meteor plasma using reference laser-induced breakdown spectroscopy of meteorite samples

Astronomy & Astrophysics EDP Sciences 610 (2018) A73-A73

Authors:

Martin Ferus, Jakub Koukal, Libor Lenža, Jiří Srba, Petr Kubelík, Vojtěch Laitl, Ekaterina M Zanozina, Pavel Váňa, Tereza Kaiserová, Antonín Knížek, Paul Rimmer, Elias Chatzitheodoridis, Svatopluk Civiš

Abstract:

Aims. We aim to analyse real-time Perseid and Leonid meteor spectra using a novel calibration-free (CF) method, which is usually applied in the laboratory for laser-induced breakdown spectroscopic (LIBS) chemical analysis. Methods. Reference laser ablation spectra of specimens of chondritic meteorites were measured in situ simultaneously with a high-resolution laboratory echelle spectrograph and a spectral camera for meteor observation. Laboratory data were subsequently evaluated via the CF method and compared with real meteor emission spectra. Additionally, spectral features related to airglow plasma were compared with the spectra of laser-induced breakdown and electric discharge in the air. Results. We show that this method can be applied in the evaluation of meteor spectral data observed in real time. Specifically, CF analysis can be used to determine the chemical composition of meteor plasma, which, in the case of the Perseid and Leonid meteors analysed in this study, corresponds to that of the C-group of chondrites.

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