نتایج جستجو برای: water cluster

تعداد نتایج: 746887  

Journal: :The journal of physical chemistry letters 2015
Adam H C West Bruce L Yoder David Luckhaus Clara-Magdalena Saak Maximilian Doppelbauer Ruth Signorell

Angle-resolved photoelectron spectroscopy of the unpaired electron in sodium-doped water, methanol, ammonia, and dimethyl ether clusters is presented. The experimental observations and the complementary calculations are consistent with surface electrons for the cluster size range studied. Evidence against internally solvated electrons is provided by the photoelectron angular distribution. The t...

Journal: :Dalton transactions 2012
Xiao-Na Li Bo Xu Xun-Lei Ding Sheng-Gui He

Vanadium oxide cluster anions (V(x)O(y)(-), x = 2-3; y = 3-7) are produced by laser ablation and reacted with water in a fast flow reactor. A time-of-flight mass spectrometer is used to detect the cluster distribution before and after the reactions. Reaction channels of molecular hydrogen elimination (for V(2,3)O(3)(-)), water association (for V(2)O(5)(-) and V(3)O(6,7)(-)) and the coexistence ...

2009
Antony J. Ward Gregory J. Arrow Thomas Maschmeyer Anthony F. Masters Peter Turner Jack K. Clegg

The title compound (NH(4))(4)[Mo(8)O(24)(O(2))(2)(H(2)O)(2)]·4H(2)O, consists of an octa-molybdate cluster with a crystallographic centre of symmetry. The clusters pack in a cubic close packing arrangement defining channels containing water mol-ecules and ammonium cations, which exhibit hydrogen bonding with neighbouring clusters. Hydrogen bonding also exists between the coordinated water mol-e...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

during natural gas processing, water in natural gas may cause to hydrates formation in pipelines which may lead to serious damages to process equipments. given the problems raised by present of water in natural gas, glycol solvent uses to remove water.in contact of glycol with gas always an amount of btex and voc absorb along with water, which on glycol recovery process, these substances separa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت معلم تهران - دانشکده علوم 1370

determination of uranium in natural water and complex solutions using ion exchange chromatography: a combined procedure using ion exchange chromatography and uv-vis spectrophotometry techniques has been developed to measure uranum in natural water and complex solutions. after conditicing , one hundred milli liters of sample solutions have been passed through an ion exchange column,pachked with ...

Journal: :Journal of the American Chemical Society 2013
E Sanz C Vega J R Espinosa R Caballero-Bernal J L F Abascal C Valeriani

Among all of the freezing transitions, that of water into ice is probably the most relevant to biology, physics, geology, or atmospheric science. In this work, we investigate homogeneous ice nucleation by means of computer simulations. We evaluate the size of the critical cluster and the nucleation rate for temperatures ranging between 15 and 35 K below melting. We use the TIP4P/2005 and the TI...

2012
H Schöbel C Leidlmair P Bartl S Denifl T D Märk O Echt P Scheier

Helium droplets were co-doped with C60 and ammonia, water or carbon dioxide and the resulting cluster size distributions of the produced cationic complexes are presented. Mass spectra obtained by electron ionization were recorded with high mass resolution of m/m ~ 6000 (FWHM). Series of C60(H2O)n, C60(NH3)n and C60(CO2)n complexes for n up to 20 molecules attached to the C60 were observed amon...

2003
Henna Ruuska Tapani A. Pakkanen Richard L. Rowley

Interaction energies of a water molecule with a model Cu(111) surface were investigated using the cluster model approach and high-level ab initio methods. Potential energy scans were calculated for a Cu10 model cluster and a water molecule with a second-order Møller-Plesset (MP2) method using a RECP/6-31+G* basis set and counterpoise correction (CP) for the basis set superposition error (BSSE)....

Journal: :Physics 2021

In water, single electrons can cluster with water molecules to form a quasiparticle that oscillates in size, behavior could influence the equilibration speed of chemical reactions system. &nbsp

Journal: :Journal of the American Chemical Society 2008
Matthew F Bush Richard J Saykally Evan R Williams

Infrared laser action spectroscopy is used to characterize divalent calcium ions solvated by up to 69 water molecules. The spectrum for Ca(2+)(H2O)12 indicates that in the predominant structure, eight inner-shell water molecules solvate the metal ion and donate one hydrogen bond to one of four second-shell, double-acceptor water molecules. Eight-coordinate solvation is consistent with results f...

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