Krisztina Imrik
Hungarian Academy of Sciences
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Featured researches published by Krisztina Imrik.
Physical Chemistry Chemical Physics | 2004
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
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
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
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
Krisztina Imrik; Sándor Dóbé; T. Bérces
Reaction Kinetics and Catalysis Letters | 2004
Edit Farkas; Gergely Kovács; Krisztina Imrik; Istvan Szilagyi; Sándor Dóbé; Ferenc Márta
Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics | 1998
Istvan Szilagyi; Krisztina Imrik; Sándor Dóbé; T. Bérces
Archive | 2007
Sándor Dóbé; Ákos Bencsura; T. Bérces; Edit Farkas; Krisztina Imrik
Archive | 2007
T. Bérces; Krisztina Imrik
Reaction Kinetics and Catalysis Letters | 2003
Krisztina Imrik; Dariusz Sarzyński; Sándor Dóbé; T. Bérces; Ferenc Márta