نتایج جستجو برای: halogens
تعداد نتایج: 2719 فیلتر نتایج به سال:
DOI: 10.1002/aenm.201602328 precursors,[4] doping proves challenging for solution-synthesized MC nanostructures.[5] Recently, post-synthesis halide treatment of nanocrystals in solution has been developed which involves switching halogens for long chain surfactant molecules absorbed on the surface.[2,6] In fact, sorption of halogens can be realized as part of a one-pot synthesis using metal hal...
A box model study on photochemical interactions between VOCs and reactive halogen species in the marine boundary layer K. Toyota, Y. Kanaya, M. Takahashi , and H. Akimoto Frontier Research System for Global Change, Yokohama, Japan Also at Center for Climate System Research, The University of Tokyo, Tokyo, Japan Received: 1 August 2003 – Accepted: 28 August 2003 – Published: 1 September 2003 Cor...
The positron-emitting radiohalogens 18F, 75Br, 76Br, and 124I are reviewed regarding their relevance for positron emission tomography (PET) in oncology. Relevant production routes of these cyclotron-generated isotopes are given, followed by publications that deal with applications of these radiohalogens. This article tries to cover the whole literature for the non-conventional isotopes 75Br, 76...
The structure and properties of absorbed fluorine and chlorine atoms on GaAs surfaces are investigated. The energies of surface species' localized vibrations are determined. Our results show that localized As±Cl and Ga±Cl valence vibrations occur in the 40 and 50 meV regimes, respectively, while As±F and Ga±F vibrations are found in the 90 and 80 meV regimes, respectively. Comparisons are made ...
High-resolution photoelectron spectra of F2, Clz, Brz, Iz, IC1 and IBr are reported and interpreted in terms of the electronic structures of these molecules. Vertical and adiabatic ionization potentials as well as vibrational data are given for the ionized states arising from the removal of an electron from each molecular orbital. Where possible, these values are related to the emission spectra...
A bond charge model has been developed for the description of the pressure dependence for the Raman-active zone centre phonon frequencies of CI, Br and I. The increase in covalency of the intermolecular bonds shows up in increasing values of the bond charges under pressure. The halogens CI, Br and I form isomorphic molecular crystals. The structure is orthcrhombic with two molecules per primiti...
Although group (IV-VII) nonmetallic elements do not favor interacting with anionic species, there are counterexamples including the halogen bond. Such binding is known to be related to the charge deficiency because of the adjacent atom's electron withdrawing effect, which creates σ/π-holes at the bond-ends. However, a completely opposite behavior is exhibited by N2 and O2, which have electrosta...
Abstract: This paper describes a shearing interferometer with four diffraction gratings for dividing light waves. It allows us to use an extended white light source. This feature of the interferometer is discussed and demonstrated by experiments. By constructing the interferometer for testing transparent object, phase distribution of the light wave passing through an optical lens is measured wi...
UV-vis and Raman spectroscopy were used to study iodine molecules trapped in sII clathrate hydrate structures stabilized by THF, CH(2)Cl(2), or CHCl(3). The spectra show that the environment for iodine inside the water cage is significantly less perturbed than either in aqueous solution or in amorphous water-ice. The resonance Raman progression of I(2) in THF clathrate hydrate can be observed u...
This report details the synthesis of several benzonorbornadienes by Diels--Alder cycloaddition of cyclopentadiene derivatives with substituted benzyne intermediates, which were generated by low-temperature metal--halogen exchange of halobenzenes. General conditions were developed, allowing synthesis of most benzonorbornadienes described herein at the multigram scale with isolated yields approac...
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