13587-54-7Relevant articles and documents
Isotope effects in the deactivation of O( 1 D) atoms by XCl and XF (X=H,D)
Chichinin
, p. 425 - 432 (2000)
The method of time-resolved laser magnetic resonance (LMR) was used to study the deactivation of O(1D) by HCl, DCl, HF, and DF at room temperature. For O(1D)+XF(X=H,D), the effect of deuteration on the rates of physical quenching and
Dissociative recombination of H+ (H2 O)3 and D+ (D2 O)3 water cluster ions with electrons: Cross sections and branching ratios
Oejekull, J.,Andersson, P. U.,Naagaard, M. B.,Pettersson, J. B. C.,Markovic, N.,et al.
, p. 1 - 8 (2009/12/02)
Dissociative recombination (DR) of the water cluster ions H+ (H2 O)3 andD+ (D2 O)3 with electrons has been studied at the heavy-ion storage rin g CRYRING (Manne Siegbahn Laboratory, Stockholm University). For the first time, absolute DR cross sections have been measured for H+ (H2 O)3 inthe energy range of 0.001-0.8 eV, and relative cross sections have been measured for D+ (D2 O)3 in the energy range of 0.001-1.0 eV. The DR cro ss sections for H+ (H2 O)3 are larger than previously observed for H+ (H2 O)n (n=1,2), which is in agreement with the previously observed trend indicating that the DR rate coefficient increases with size of the watercluster ion. Branching ratios have been determined for the dominating p roduct channels. Dissociative recombination of H+ (H2 O)3 mainly resultsin the formation of 3 H2 O+H (probability of 0.95±0.05) and with a possible minor channel resulting in 2 H2 O+OH+ H2 (0.05±0.05). The dominating channels for DR of D+ (D2 O)3 are 3 D2 O+D (0.88± 0.03) and 2 D2 O+OD+ D2 (0.09±0.02). The branching ratios are comparable to earlier DR results for H+ (H2 O)2 and D+ (D2 O)2, which gave 2 X2 O+X (X=H,D) with a probability of over 0.9.
Photoinitiated H- and D-atom reactions with N2O in the gas phase and in N2O-HI and N2O-DI complexes
Boehmer, E.,Shin, S. K.,Chen, Y.,Wittig, C.
, p. 2536 - 2547 (2007/10/02)
Reactions of H atoms with N2O have two product channels yielding NH + NO and OH + N2.Both channels were observed via NH A3Π X3Σ and OH A2Σ X2Π laser-induced fluorescence spectra.Photoinitiated reactions with N2O-HI complexes yield a much lower / ratio than under the corresponding bulk conditions at the same photolysis wavelength.For hot D-atom reactions with N2O, this effect is somewhat more pronouced.These results can be interpreted in terms of entrance channel geometric specificity, namely, biasing hydrogen attack toward the oxygen.Another striking observation is that the OH and OD rotational level distributions (RLD) obtained under bulk conditions differ markedly from those obtained under complexed conditions, while the NH as well as the ND RLD are similar for the two environments.In addition, OH Doppler profiles change considerably in going from bulk to complexed conditions, while such an effect is not observed for NH.The changes observed with the OH RLD are most likely due to OH-halogen interactions and/or entrance channel specificity.Under bulk conditions, the Doppler shift measurements indicate a large amount of N2 internal excitation (i.e., ca. 25 000 cm-1) for the OH (Υ = 0) levels monitored.This is consistent with a reaction mechanism involving an HNNO intermediate.The hot hydrogen atom first attaches to the terminal nitrogen of N2O and forms an excited HNNO intermediate having a relatively elongated N-N bond compared with N2O.Then the H atom migrates from nitrogen to oxygen and exits to the N2 + OH product channel, leaving N2 vibrationally excited.A simple Franck-Condon model can reconcile quantitatively the large amount of N2 vibrational excitation.
