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Dive into the research topics where Krisztina Imrik is active.

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Featured researches published by Krisztina Imrik.


Physical Chemistry Chemical Physics | 2004

Laser spectrometry and kinetics of selected elementary reactions of the acetonyl radical

Krisztina Imrik; Edit Farkas; Gábor Vasvári; Istvan Szilagyi; Dariusz Sarzyński; Sándor Dóbé; T. Bérces; Ferenc Márta

The laser induced fluorescence excitation spectrum (LIF) and the ultraviolet absorption spectrum (TA) of the acetonyl radical (CH3C(O)CH2) were remeasured by using the time-resolved fast discharge flow (DF) and laser flash photolysis (LP) experimental techniques (T = 298 K). The absorption cross section of σ(acetonyl, 207 nm) = (3.16 ± 0.61) × 10−18 cm2 molecule−1 was determined calibrated against the acetyl-peroxyl radical (CH3C(O)O2) in LP/TA measurements. The kinetics of the reactions of CH3C(O)CH2 with the open shell reaction partners O2 (1), NO (2), NO2 (3) and H (4) were studied by using the DF method with LIF detection of the acetonyl radical at 298 ± 1 K and 2.85 ± 0.05 mbar He pressure. The rate constants for the overall reactions were determined in units of cm3 molecule−1 s−1 to be k1 = (3.49 ± 0.51) × 10−13, k2 = (1.04 ± 0.19) × 10−11, k3 = (3.25 ± 0.65) × 10−11 and k4 ≥ 3 × 10−10 with 2σ accuracy given. The acetonyl radical was found to react similarly to alkyl radicals by comparison with literature results. A reduced reactivity was observed toward O2 and NO that might be attributed to the resonance stabilisation of the acetonyl radical. No such effect was observed for the NO2 and H atom reactions.


Reaction Kinetics and Catalysis Letters | 2003

Competitive bromination kinetics of CH3Br and CH2ClBr

Krisztina Imrik; Dariusz Sarzyński; Sándor Dóbé; T. Bérces; Ferenc Márta

The relative-rate method with gas-chromatographic product analysis was applied to study the kinetics of the reactions Br + CH3Br → CH2Br + HBr (1) and Br + CH2ClBr → CHClBr + HBr (2) The rate coefficient ratio of k1/ k2 = (1.6 ± 0.2) exp[(-15.2 ± 0.3) kJ mol-1/ RT] was determined in the temperature range of 353 - 410 K.


Reaction Kinetics and Catalysis Letters | 2002

Kinetic study of the reaction of CH3O with Br and Br2

Istvan Szilagyi; Krisztina Imrik; Dariusz Sarzińsky; Sándor Dóbé; T. Bérces

The title reactions have been studied at room temperature by applying the discharge flow method coupled with laser induced fluorescence detection of methoxy radicals and resonance fluorescence detection of bromine atoms. The following rate constants were determined: CH3O + Br Õ products (1) k1 (298 K) = (3.4 ± 0.4 (1σ)) × 1013 cm3 mol-1 s-1, CH3O + Br2 Õ products (2) k2 (298 K) £ 5 × 108 cm3 mol-1 s-1.


Reaction Kinetics and Catalysis Letters | 2001

Kinetic and Spectroscopic Study of C2H5C(O)O2 Radicals Using Laser Flash Photolysis and UV Absorption Spectrometry

Ákos Bencsura; Krisztina Imrik; Sándor Dóbé; T. Bérces

Rate constant for the self-combination reaction of the propionylperoxy radical was measured at room temperature using laser photolysis - transient absorption technique. The observed rate coefficient is (1.44 ± 0.14)x10−11 cm3 molecule−1 s−1 at 298 K.


International Journal of Chemical Kinetics | 2001

Direct kinetic parameters for the reaction of Br atoms with neopentane

Krisztina Imrik; Sándor Dóbé; T. Bérces


Reaction Kinetics and Catalysis Letters | 2004

Polar effect in the reaction of CH3O with HBr

Edit Farkas; Gergely Kovács; Krisztina Imrik; Istvan Szilagyi; Sándor Dóbé; Ferenc Márta


Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics | 1998

Kinetics of the reactions of bromine atoms with a series of aliphatic aldehydes at 298 K

Istvan Szilagyi; Krisztina Imrik; Sándor Dóbé; T. Bérces


Archive | 2007

Szabadgyök - molekula és molekula - molekula komplexek keletkezése és szerepük gázfázisú elemi reakciók kinetikájában és dinamikájában = Formation and role of radical-molecule and molecule-molecule complexes in the kinetics and dynamics of gas phase elementary reactions

Sándor Dóbé; Ákos Bencsura; T. Bérces; Edit Farkas; Krisztina Imrik


Archive | 2007

Égésekben szerepet játszó OH-gyök és H-atom reakciók kinetikája = The kinetics of OH-radical and H-atom reactions of importance in combustion

T. Bérces; Krisztina Imrik


Reaction Kinetics and Catalysis Letters | 2003

Competitive bromination kinetics of CH 3 Br and CH 2 ClBr

Krisztina Imrik; Dariusz Sarzyński; Sándor Dóbé; T. Bérces; Ferenc Márta

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Sándor Dóbé

Hungarian Academy of Sciences

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T. Bérces

Hungarian Academy of Sciences

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Ferenc Márta

Hungarian Academy of Sciences

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Edit Farkas

Hungarian Academy of Sciences

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Dariusz Sarzyński

Wrocław Medical University

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Ákos Bencsura

Hungarian Academy of Sciences

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Gergely Kovács

Hungarian Academy of Sciences

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Gábor Vasvári

Hungarian Academy of Sciences

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