Correlations between angular momenta of coincident product pairs
摘要:
The correlation between angular momenta of the coincident product pairs formed in an elementary dissociation process has been investigated. Doppler shift measurements are used in connection with state-specific detection of scattered photofragments by laser-induced fluorescence. The method is demonstrated in the photodissociation of H2O2 and D2O2 at 193 and 266 nm where Doppler profiles of OH (OD) absorption lines are used to determine the (average) rotational energy of the OH (OD) partner molecule coincidently formed in the same elementary fragmentation process. At high product rotations the partner molecules are generated with comparable angular momenta, while at low rotational excitation a more complex correlation is observed. In addition to the partner fragment distribution, dissociation energies were determined to be 197 kJ/mol for HO–OH and 204 kJ/mol for DO–OD, which are significantly lower than the previously recommended values.
Reversible O−O Bond Cleavage and Formation between Mn(IV)-Peroxo and Mn(V)-Oxo Corroles
作者:Sun Hee Kim、Hyejin Park、Mi Sook Seo、Minoru Kubo、Takashi Ogura、Jan Klajn、Daniel T. Gryko、Joan Selverstone Valentine、Wonwoo Nam
DOI:10.1021/ja1066465
日期:2010.10.13
Mn(IV)-peroxo and Mn(V)-oxo corroles were synthesized and characterized with various spectroscopic techniques. The intermediates were directly used in O-O bond cleavage and formation reactions. Upon addition of proton to the Mn(IV)-peroxo corrole, the formation of the Mn(V)-oxo corrole was observed. Interestingly, addition of base to the Mn(V)-oxo corrole afforded the formation of the Mn(IV)-peroxo
End-On and Side-On Peroxo Derivatives of Non-Heme Iron Complexes with Pentadentate Ligands: Models for Putative Intermediates in Biological Iron/Dioxygen Chemistry
作者:Gerard Roelfes、Vladislav Vrajmasu、Kui Chen、Raymond Y. N. Ho、Jan-Uwe Rohde、Charon Zondervan、Rene M. la Crois、Ebe P. Schudde、Martin Lutz、Anthony L. Spek、Ronald Hage、Ben L. Feringa、Eckard Münck、Lawrence Que
DOI:10.1021/ic034065p
日期:2003.4.1
series of iron(II) complexes with pentadentate N5 ligands that react with H(2)O(2) to generate transient low-spin Fe(III)-OOH intermediates. These intermediates have low-spiniron(III) centers exhibiting hydroperoxo-to-iron(III) charge-transfer bands in the 500-600-nm region. Their resonance Raman frequencies, nu(O)(-)(O), near 800 cm(-)(1) are significantly lower than those observed for high-spin counterparts
Spatial Distribution of Free Radicals as studied by Electron Spin Resonance
作者:ROBERT C. SMITH、S. J. WYARD
DOI:10.1038/191897a0
日期:1961.8
THE spatial distribution of freeradicals produced by irradiation is of interest in radiation chemistry and radiation biology. Although there have been many theoretical treatments of this problem, direct experimental evidence has so far been lacking. Electronspinresonance spectroscopy provides a means of measuring the distribution of freeradicals; and we report here a preliminary investigation by
The kinetics of the reactions of BrOradicals with HO2 and DO2 radicals, HO2 + BrO → products (1) and DO2 + BrO → products (3), have been studied by the mass spectrometric discharge flow method at ...
The disproportionation of DO2 radicals studied by infrared laser spectroscopy
作者:N.A. Martin、B.A. Thrush
DOI:10.1016/0009-2614(88)85212-6
日期:1988.12
The rate coefficient for the bimolecular disproportionation of DO2radicals has been measured at total pressures between 6 and 15 Torr using flash photolysis and tunable diode laserspectroscopy. The rate coefficient at temperatures between 297 and 354 K can be expressed as 2.0 × 10−14 exp(+920/T) cm3 molecule−1 s−1. The measured strength of the ν2 band of DO2 at 1020 cm−1 is 107±30 cm−2 (STP atm)−1