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Wyszukujesz frazę "pulse radiolysis" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
The mechanism and kinetics of ozone formation in a pulse radiolysis study of the Ar-O2 system
Autorzy:
Wojciechowski, K.
Sugier, D.
Wnorowski, K.
Kowalczyk, J.
Jówko, A.
Powiązania:
https://bibliotekanauki.pl/articles/147852.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
pulse radiolysis
argon
oxygen
ozone
Opis:
The mechanism and kinetics of O3 formation after an electron pulse have been studied in the Ar-O2 systems by time resolved optical measurements at gamma = 260 nm. The second order rate constant of energy transfer from excited Ar(4s,4p) states to O2 molecules: (1) Ar*,Ar** + O2 → O2* + Ar, was found to be (8.9 ± 2.1) x 10-10 cm3 s-1. It was found also the evidence of the third order process contribution to the energy transfer: (2) Ar*,Ar** + Ar + O2 → products, with the rate constant in the range (1.5-3.7) x 10-29 cm6 s-1. The rate constant of the deactivation of excited ozone molecules by O2 was found to be (5.1 ± 0.6) ´ 10-15 cm3 s-1.
Źródło:
Nukleonika; 2005, 50,suppl.2; 29-33
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Br2 '-, BrSCN'- and (SCN)2'-intermediates in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide. Pulse radiolysis study
Autorzy:
Grodkowski, J.
Nyga, M.
Mirkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/147848.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ionic liquids
pulse radiolysis
Br2
Opis:
The reactions of Br2 '- anion radicals with thiocyanate anions in the ionic liquid methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide (R4NNTf2) were studied by pulse radiolysis. Reaction of solvated electrons with BrCH2CH2Br (DBE), k = (1 2)×108 L.mol 1.s 1, leads to the production of Br2'- anion radicals. The intermediate absorption spectra following pulse radiolysis of DBE/SCN-/Br-/ solutions in R4NNTf2 correspond to Br2 '-, BrSCNo- and (SCN)2'- anion radicals. The participation of these radicals in the spectra changes with progressing reactions and depends on the concentration Br- and SCN- in the solution.
Źródło:
Nukleonika; 2005, 50,suppl.2; 35-38
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free radicals in chemistry, biology and medicine: contribution of radiation chemistry
Autorzy:
Bobrowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/147946.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
free radicals
pulse radiolysis
oxidative stress
ionic liquids
long range electron transfer
beta-amyloid peptide
Opis:
The scope of this article is limited to the concept of free radical and its historical background and a brief introduction to time-resolved techniques (pulse radiolysis, laser flash photolysis), which allowed direct observation of free radicals on real time. The selected contributions of pulse radiolysis to better understanding the role of free radical reactions in chemistry, biology and medicine are presented and some selected future research needs and opportunities in radiation chemistry are briefly addressed.
Źródło:
Nukleonika; 2005, 50,suppl.3; 67-76
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intermediates derived from p-terphenyl in the methyltributylammonium bis[(trifluoromethyl)sulfonyl]imide ionic liquid saturated with carbon dioxide : pulse radiolysis study
Autorzy:
Kocia, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/2173388.pdf
Data publikacji:
2022
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
carbon dioxide
ionic liquid
methyltributylammonium bis[(trifl uoromethyl)sulfonyl]imide
p-Terphenyl
pulse radiolysis
radical ions
Opis:
Radiation-induced processes in ionic liquid (IL) methyltributylammonium bis[(trifl uoromethyl)sulfonyl] imide ([MeBu3N][NTf2]) solutions containing p-terphenyl (TP) and saturated with carbon dioxide (CO2) were studied using nanosecond pulse radiolysis technique with UV-vis detection. The transient absorption spectra generated in these solutions were assigned to TP radical anions (TP•–) and triplet excited states (3TP*). Saturation of [MeBu3N][NTf2] solutions with carbon dioxide efficiently takes out presolvated electrons (e–presolv) and solvated electrons (e–solv). On the other hand CO2 is not a scavenger of excited states of TP (1TP*, 3TP*), which in the reaction with triethylamine (TEA) leads to the formation of TP•-.
Źródło:
Nukleonika; 2022, 67, 4; 73--80
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent upgrading of the nanosecond pulse radiolysis setup and construction of laser flash photolysis setup at the Institute of Nuclear Chemistry and Technology in Warsaw, Poland
Autorzy:
Szreder, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2173384.pdf
Data publikacji:
2022
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
computer-controlled systems
data collection software
data processing software
laser flash photolysis
pulse radiolysis
time-resolved techniques
Opis:
Modification of pulse radiolysis (PR) setup and construction of a new laser flash photolysis (LFP) setup at the Institute of Nuclear Chemistry and Technology (INCT) is described. Both techniques are dedicated to studying fast reactions in real time by direct observation of transients. Time resolution of the PR setup at INCT was ~11 ns, limited by the duration of the electron pulse. Implementation of a new spectrophotometric detection system resulted in a significant broadening of experimental spectral range with respect to the previous setup. Noticeable reduction of the noise-to-signal ratio was also achieved. The LFP system was built from scratch. Its time resolution was ~6 ns, limited by the duration of a laser pulse. LFP and PR were purposely designed to share the same hardware and software solutions. Therefore, components of the detection systems can be transferred between both setups, signifi cantly lowering the costs and shortening the construction/upgrading time. Opened architecture and improved experimental fl exibility of both techniques were accomplished by implementation of Ethernet transmission control protocol/Internet protocol (TCP/IP) communication core and newly designed software. This is one of the most important enhancements. As a result, new experimental modes are available for both techniques, improving the quality and reducing the time of data collections. In addition, both systems are characterized by relatively high redundancy. Currently, implementation of new equipment into the systems hardly ever requires programming. In contrast to the previous setup, daily adaptations of hardware to experimental requirements are possible and relatively easy to perform.
Źródło:
Nukleonika; 2022, 67, 3; 49--64
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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