Search results for: P. Cermak

Items from 1 to 20 out of 70 results

article

Analysis and theoretical modeling of the 18O enriched carbon dioxide spectrum by CRDS near 1.74 µm

E.V. Karlovets, P. Čermák, D. Mondelain, S. Kassi, more

Journal of Quantitative Spectroscopy and Radiative Transfer > 2018 > 217 > C > 73-85

The very weak absorption spectrum of the minor isotopologues of carbon dioxide near 1.74 µm (5702–5879 cm⁻¹) is studied by high sensitivity cavity ring down spectroscopy (CRDS) with an ¹⁸O enriched sample. The investigated spectral region corresponds to a transparency window of very weak opacity which is of particular interest for Venus. Very weak lines with intensity value as low as 10⁻³⁰ cm/molecule...

article

Thermoelectric and magnetic properties of Cr-doped single crystal Bi2Se3 – Search for energy filtering

P. Cermak, P. Ruleova, V. Holy, J. Prokleska, more

Journal of Solid State Chemistry > 2018 > 258 > C > 768-775

Thermoelectric effects are one of the promising ways to utilize waste heat. Novel approaches have appeared in recent decades aiming to enhance thermoelectric conversion. The theory of energy filtering of free carriers by inclusions is among the latest developed methods. Although the basic idea is clear, experimental evidence of this phenomenon is rare. Based on this concept, we searched suitable systems...

article

The CO2 absorption continuum by high pressure CRDS in the 1.74µm window

D. Mondelain, A. Campargue, P. Čermák, R.R. Gamache, more

Journal of Quantitative Spectroscopy and Radiative Transfer > 2017 > 203 > C > 530-537

The very weak absorption continuum of CO₂ is studied by Cavity Ring Down Spectroscopy in three 20cm⁻¹ wide spectral intervals near the centre of the 1.74µm window (5693–5795cm⁻¹). For each spectral interval, a set of room temperature spectra is recorded at pressures between 0 and 10bar thanks to a high pressure CRDS spectrometer. The absorption continuum is retrieved after subtraction of the contributions...

article

The absorption spectrum of water vapor in the 2.2μm transparency window: High sensitivity measurements and spectroscopic database

A. Campargue, S.N. Mikhailenko, S. Vasilchenko, C. Reynaud, more

Journal of Quantitative Spectroscopy and Radiative Transfer > 2017 > 189 > C > 407-416

The weak absorption spectrum of water vapor in the important 2.2μm transparency window is investigated with very high sensitivity. Overall, about 400 absorption lines were measured by Cavity Ring Down Spectroscopy (CRDS) and Optical-Feedback-Cavity Enhanced Laser Spectroscopy (OF-CEAS) in five spectral intervals: 4248.2–4257.3, 4298.4–4302.6, 4336.8.5-4367.5, 4422.4-4441.2 and 4514.6-4533.7cm⁻¹. The...

article

First laboratory detection of an absorption line of the first overtone electric quadrupolar band of N2 by CRDS near 2.2μm

P. Čermák, S. Vasilchenko, D. Mondelain, S. Kassi, more

Chemical Physics Letters > 2017 > 668 > C > 90-94

The extremely weak 2–0 O(14) electric quadrupole transition of N₂ has been detected by very high sensitivity Cavity Ring Down spectroscopy near 4518cm⁻¹. It is the first N₂ absorption line in the first overtone band reported so far from laboratory experiments. By combining a feedback narrowed Distributed Feedback laser diode with a passive cell tracking technique, a limit of detection of αmin∼1.2×10...

article

The CO2 absorption spectrum in the 2.3µm transparency window by high sensitivity CRDS: (II) Self-absorption continuum

D. Mondelain, S. Vasilchenko, P. Čermák, S. Kassi, more

Journal of Quantitative Spectroscopy and Radiative Transfer > 2017 > 187 > C > 38-43

The CO₂ absorption continuum near 2.3µm is determined for a series of sub atmospheric pressures (250–750Torr) by high sensitivity Cavity Ring Down Spectroscopy. An experimental procedure consisting in injecting successively a gas flow of CO₂ and synthetic air, keeping constant the gas pressure in the CRDS cell, has been developed. This procedure insures a high stability of the spectra baseline by...

article

The CO2 absorption spectrum in the 2.3µm transparency window by high sensitivity CRDS: (I) Rovibrational lines

S. Vasilchenko, M. Konefal, D. Mondelain, S. Kassi, more

Journal of Quantitative Spectroscopy and Radiative Transfer > 2016 > 184 > C > 233-240

The absorption of carbon dioxide is very weak near 2.3µm which makes this transparency window of particular interest for the study of Venus’ lower atmosphere. As a consequence of the weakness of the transitions located in this region, previous experimental data are very scarce and spectroscopic databases provide calculated line lists which should be tested and validated by experiment. In this work,...

article

A new list of line positions and strengths of 15NH3 in the range 6369–6578cm−1 at room temperature

J. El Romh, P. Cacciani, F. Taher, P. Čermák, more

Journal of Molecular Spectroscopy > 2016 > 326 > C > 122-129

The spectrum of ¹⁵NH₃ has been investigated at room temperature in the 6367–6578cm⁻¹ region using an external cavity tunable diode laser spectrometer. Particular care was taken to discriminate ¹⁵NH₃ from the main species ¹⁴NH₃ present as an impurity in the spectra. As a result, a new list of line positions and line strengths has been proposed for this isotopologue. Together 3002 transitions have been...

article

The HD spectrum near 2.3μm by CRDS-VECSEL: Electric quadrupole transition and collision-induced absorption

S. Vasilchenko, D. Mondelain, S. Kassi, P. Čermák, more

Journal of Molecular Spectroscopy > 2016 > 326 > C > 9-16

The HD absorption spectrum is investigated near 2.3μm with the help of a newly developed Cavity Ring Down Spectrometer (CRDS) using a VECSEL (Vertical External Cavity Surface Emitting Laser) as light source. The HD CRDS spectra were recorded for a series of ten pressure values in the range 50–650Torr. The sensitivity of the recordings – noise equivalent absorption of the spectra on the order of α_min...

article

Oak (Quercus spp.) response to climate differs more among sites than among species in central Czech Republic

M. Rybnicek, P. Cermak, O. Prokop, T. Zid, more

Dendrobiology > 2016 > 75

Climatic parameters are the main environmental factors affecting tree growth. The main aim of the presented study was to determine whether different oak species growing under contrasting environmental conditions show different sensitivity to climatic parameters. Four oak stands with Quercus robur, Quercus petraea, Quercus polycarpa and Quercus dalechampii growing in the same area were evaluated. Standard...

article

Evolution of magnetism in Pd-substituted Ce2RhIn8 single crystals

M. Kratochvilova, K. Uhlirova, J. Prokleska, S. Danis, more

Physica B: Physics of Condensed Matter > 2015 > 468-469 > Complete > 96-100

The evolution of magnetism and superconductivity in Ce ₂ Rh _1−x Pd _x In ₈ solid solutions has been studied within the entire concentration range by means of thermodynamic and magnetic measurements at ambient pressure and at temperatures between 0.35K and room temperature. For this purpose, single crystals with Pd concentrations x=0, 0.10, 0.15, 0.30, 0.45, 0.55, 0.85...

article

Exploring Growth Variability and Crown Vitality of Sessile Oak (Quercus petraea) in the Czech Republic

M. Rybníček, P. Čermák, T. Žid, T. Kolář, more

Geochronometria > 2015 > Vol. 42, no.1 > 17--27

Unraveling climatic effects on growth of oak — Europe’s most ecologically and economically important forest species — has been the subject of many recent studies; however, more insight based on field data is necessary to better understand the relationship between climate and tree growth and to adapt forest management strategies to future climate change. In this report, we explore the influence of...

article

A review of the development of portable laser induced breakdown spectroscopy and its applications

J. Rakovský, P. Čermák, O. Musset, P. Veis

Spectrochimica Acta Part B: Atomic Spectroscopy > 2014 > 101 > C > 269-287

In this review, we present person-transportable laser induced breakdown spectroscopy (LIBS) devices that have previously been developed and reported in the literature as well as their applications. They are compared with X-ray fluorescent (XRF) devices, which represent their strongest competition. Although LIBS devices have advantages over XRF devices, such as sensitivity to the light elements, high...

article

High-field magnetization and magnetic phase diagrams in Nd2RhIn8 and Tb2RhIn8

P. Javorský, K. Pajskr, M. Klicpera, P. Čermák, more

Journal of Alloys and Compounds > 2014 > 598 > Complete > 278-281

We present magnetic phase diagrams of Nd ₂ RhIn ₈ and Tb ₂ RhIn ₈ determined by magnetization and magnetoresistivity measurements on single crystals, including high-field magnetization up to 60T. Both compounds order antiferromagnetically with the c-axis as the easy magnetization axis. Their magnetic phase diagrams are qualitatively rather similar. At low temperatures...

article

Investigation of double beta decay of 100Mo to excited states of 100Ru

R. Arnold, C. Augier, A.S. Barabash, A. Basharina-Freshville, more

Nuclear Physics, Section A > 2014 > 925 > Complete > 25-36

Double beta decay of ¹ ⁰ ⁰ Mo to the excited states of daughter nuclei has been studied using a 600 cm ³ low-background HPGe detector and an external source consisting of 2588 g of 97.5% enriched metallic ¹ ⁰ ⁰ Mo, which was formerly inside the NEMO-3 detector and used for the NEMO-3 measurements of ¹ ⁰ ⁰ Mo. The half-life for the two-neutrino...

article

Spectroscopy of 14NH3 and 15NH3 in the 2.3μm spectral range with a new VECSEL laser source

P. Čermák, J. Hovorka, P. Veis, P. Cacciani, more

Journal of Quantitative Spectroscopy and Radiative Transfer > 2014 > 137 > Complete > 13-22

A spectroscopic study of ammonia molecule in the 2.3μm water atmospheric window is presented. Compared to previous experimental works a narrow, broadly tunable, continuous laser source was applied in order to obtain high resolution spectra in this range. It was the first application of the newly developed Vertical External Cavity Surface Emitting Laser (VECSEL). The analysis of the absorption spectra...

article

Crystal structure and its stability in CeCuAl3 single crystal

M. Klicpera, P. Javorský, P. Čermák, A. Rudajevová, more

Intermetallics > 2014 > 46 > Complete > 126-130

We present the crystal structure investigation of CeCuAl ₃ compound. Our X-ray diffraction study confirms unambiguously BaNiSn ₃ -type structure as the crystal structure of CeCuAl ₃ in whole temperature range. Moreover, phase transition around 300 °C was found by our high-temperature powder X-ray diffraction measurement. This transition preserves BaNiSn ₃ -type structure,...

article

Specific heat study of R2RhIn8 (R=Y, La, Lu) compounds

P. Čermák, M. Diviš, M. Kratochvílová, P. Javorský

Solid State Communications > 2013 > 163 > Complete > 55-59

We present a detailed specific heat analysis of the non-magnetic R ₂ RhIn ₈ (R=Y, La, Lu) compounds, crystallizing in the tetragonal Ho ₂ CoGa ₈ -type structure. We focus on the lattice contribution and analyze the characteristic parameters in the Debye and Einstein models. The most prominent feature is the presence of low energy phonons in these compounds. We also...

article

Observation of methane nuclear spin isomers in gas phase at low temperature

P. Čermák, P. Cacciani, J. Cosléou, M. Khelkhal, more

Journal of Molecular Spectroscopy > 2012 > 279 > Complete > 37-43

A spectroscopic study of methane spectra in the range around 6764cm ⁻¹ was performed at different temperatures (from 55 to 200K). The recorded spectra were used to increase the precision of transitions lower states energy determination and to retrieve the self-collisional broadening parameter. Both the newly obtained results and the quality of the experimental data were used to evaluate our...

article

Experiment TGV-2 – Search for double beta decay of 106Cd

N.I. Rukhadze, Ch. Briançon, V.B. Brudanin, P. Čermák, more

Nuclear Physics B (Proceedings Supplements) > 2012 > 229-232 > Complete > 478

New limits (at 90% C.L.) on double beta decay of Cd106−T1/2(0νEC/EC)>1.7×1020yr and T1/2(2νEC/EC)>4.2×1020yr were obtained in a preliminary calculation of data accumulated for 12900 h on the TGV-2 spectrometer.

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Search results for: P. Cermak

Analysis and theoretical modeling of the 18O enriched carbon dioxide spectrum by CRDS near 1.74 µm

Thermoelectric and magnetic properties of Cr-doped single crystal Bi2Se3 – Search for energy filtering

The CO2 absorption continuum by high pressure CRDS in the 1.74µm window

The absorption spectrum of water vapor in the 2.2μm transparency window: High sensitivity measurements and spectroscopic database

First laboratory detection of an absorption line of the first overtone electric quadrupolar band of N2 by CRDS near 2.2μm

The CO2 absorption spectrum in the 2.3µm transparency window by high sensitivity CRDS: (II) Self-absorption continuum

The CO2 absorption spectrum in the 2.3µm transparency window by high sensitivity CRDS: (I) Rovibrational lines

A new list of line positions and strengths of 15NH3 in the range 6369–6578cm−1 at room temperature

The HD spectrum near 2.3μm by CRDS-VECSEL: Electric quadrupole transition and collision-induced absorption

Oak (Quercus spp.) response to climate differs more among sites than among species in central Czech Republic

Evolution of magnetism in Pd-substituted Ce2RhIn8 single crystals

Exploring Growth Variability and Crown Vitality of Sessile Oak (Quercus petraea) in the Czech Republic

A review of the development of portable laser induced breakdown spectroscopy and its applications

High-field magnetization and magnetic phase diagrams in Nd2RhIn8 and Tb2RhIn8

Investigation of double beta decay of 100Mo to excited states of 100Ru

Spectroscopy of 14NH3 and 15NH3 in the 2.3μm spectral range with a new VECSEL laser source

Crystal structure and its stability in CeCuAl3 single crystal

Specific heat study of R2RhIn8 (R=Y, La, Lu) compounds

Observation of methane nuclear spin isomers in gas phase at low temperature

Experiment TGV-2 – Search for double beta decay of 106Cd

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