34160-02-6Relevant articles and documents
Emission spectra of KrXeCl*, KrXeBr*, KrXeI*, ArKrF*, and ArKrCl*
Brashears, H.C.,Setser, D.W.,Yu, Y.-C.
, p. 10 - 17 (1981)
Sensitized reactions of Xe and Kr with halogen donors in the presence of high buffer gas pressures of Kr and Ar, respectively, have led to the observation of five emission bands in the ultraviolet region of the spectrum.These broad structureless bands are assigned to the mixed rare gas-halide trimers KrXeCl*, KrXeBr*, KrXeI*, ArKrF*, and ArKrCl*.Despite an extensive search, no emission corresponding to KrXeF* could be found and this mixed trimer may be unstable because of interaction with a lower repulsive state.The positions and half-widths of the five emission bands are characterized, and the formation mechanism of the mixed trimers in these experiments is discussed.
Excitation spectra for the photoassociation of Kr-F and Xe-I collision pairs in the ultraviolet (208-258 nm)
Jones, R. B.,Schloss, J. H.,Eden, J. G.
, p. 4317 - 4334 (1993)
Photoassociation, the bound a photon by a colliding pair of atoms, has been studied experimentally in the Kr-F and Xe-I systems and is demonstrated to be an effective tool for deducing molecular interaction potentials and for determining the dependence of the relative electronic transition moment on internuclear separation (R) in small molecules having dissociative ground states.Specifically, the excitation ( action ) spectrum for the photoassociation of thermalized Kr(4p6 1S0)-F(2p5 2P) collision pairs, measured at 300 K in the 208-250nm wavelength region, reveals deeply modulated Franck-Condon structure associated with transitions of Kr-F pairs from the ground state's thermal and vibrational continua to the lowest 27 bound vibrational states (v' = 0-26) of the KrF(B2Σ) excited state.Under these conditions, photoassociation occurs in a narrow (ΔR = 0.7-0.8 Angstroem) Franck-Condon region in which the difference potential is a single valued function of R.Similar spectra have been observed for Xe(1S0)-K(2P) pairs in the 208-258 nm spectral region that arise from bound a limited range in R and, for XeI, μ is found to fall by a factor of 2 in the ca. 0.4 Angstroem region extending from R-ReB ca. 0.25-0.62 Angstroem.The XeI ground state (X 2Σ1/2+) potential in the 3.0R5.0 Angstroem interval, derived from photoassociation spectra, is similar to that deduced from scattering experiments.Excited and ground state structural constants derived from numerical quantum simulations of the experimental spectra are presented.
Ion Recombination Rates in Rare-Gas Cation-Halide Anion Systems. 2. KrF* and XeCl*
Mezyk, Stephen P.,Cooper, Ronald,Sherwell, John
, p. 3152 - 3158 (1991)
The emission spectroscopy/pulse radiolysis method of determining three-body ionic recombination rate constants in rare-gas-halogen source gas mixtures has been extended to systems where the emission is produced by both ionic and nonionic pathways.This has enabled recombination coefficient measurements to be done over a large pressure range for irradiated Kr/SF6 and Xe/CFCl3 gas mixtures.The rate constants measured for both these systems show the typical pressure dependence of an increase to a maximum value of ca. 2.5E15 M-1 s-1 (ca. 4E-6 cm3 s-2), before the onset of the diffusion-controlled reaction.These values have been compared to the predictions of the Langevin-Harper diffusion-controlled and the Bates termolecular recombination models.The large discrepancies between theory and experiment have shown that other recombination processes dominate the ionic recombination.
Photodissociation of Kr2F(4 2Γ) in the ultraviolet and near-infrared: Wavelength dependence of KrF (B 2Σ) yield
Schloss,Tran,Eden
, p. 5423 - 5428 (1996)
The photoabsorption spectrum of the 4 2Γ excited state of Kr2F has been measured in the 280-850 nm region by fluorescence suppression spectroscopy. Both the 9 2Γ←4 2Γ and 6 2Γ←4 2Γ bands, peaking at 320 and ～710 nm, respectively, have been observed - the latter for the first time. Although the position of the ultraviolet band is consistent with both theory and previous experiments, its spectral width is ～40% of that measured by Greene and McCown [Appl. Phys. Lett. 54, 1965 (1989)] in absorption experiments in a pulsed discharge. The relative yield of KrF(B) produced in the photodissociation of Kr2F(4 2Γ) was found to be independent of wavelength over the 280-360 nm and 590-840 nm spectral intervals and the mechanism responsible for photodissociation appears to be predissociation of the Kr2F 9 2Γ and 6 2Γ states by potentials correlated with the KrF(D) + Kr and KrF(C) + Kr limits, respectively.
Photochemistry with fast sample renewal using cluster beams: Formation of rare-gas halides in charge-transfer reactions in NF3-doped rare-gas clusters
Moussavizadeh,Von Haeften,Museur,Kanaev,Castex,Von Pietrowski,Moeller
, p. 327 - 333 (2008/10/08)
Charge transfer reactions in free clusters are observed in a photoluminescence study on doped rare-gas clusters (Rg clusters, Rg = Ar, Kr and Xe). Following photoexcitation into the first absorption bands of Rg clusters, fluorescence from free RgF* excimers ejected from the clusters and from Rg2F* excimers localized in the interior of the clusters is observed. The results show that the reaction dynamics in clusters differs considerably from that in the gas and solid phase.
