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7440-23-5Relevant articles and documents
Dynamics of Nonadiabatic Reactions. 4. Effect of Enhanced Collision Energy in the Four-Center Reaction F2 + Na2 ---> F + NaF + Na*
Polanyi, J. C.,Thomas, D. F.,Visticot, J.-P.
, p. 4730 - 4733 (1989)
The four-center reaction F2 + Na2 ---> F + NaF + Na(32P) has been studied in a crossed molecular-beam experiment.The excitation function for the production of this electronically excited state has been measured over two ranges of collisiomn energy -5.8-6.8 and 9.4-15.4 kcal/mol.This cross section has been scaled for comparison with that of the three-center reaction F + Na2 ---> NaF + Na*(32P) (see the experimental results reported in the preceeding paper in this issue).The three-center reaction cross section to form Na*(32P) is also a rising function of collision energy.The three-center reaction to form Na*(32P) is connected adiabatically to the ground reactant state while the four-center reaction increases from ca. 1 to 8 Angstroem2, while that for the three-center reaction increases from ca.4 to 125 Angstroem2.Both reactions appear to involve a barrier to the production of the Na*(32P).In the case of four-center reaction, the steeply rising excitation function may result from the changing nonadiabatic behavior with increasing collision energy.
Dynamics of Nonadiabatic Reactions. 2. F + Na2 ---> NaF + Na*
Arrowsmith, P.,Bly, S. H. P.,Charters, P. E.,Chevrier, P.,Polanyi, J. C.
, p. 4716 - 4723 (1989)
Chemiluminescence from the reaction F + Na2 ---> NaF + Na*(i) has been measured for six electronically excited states of Na: the upper state of the D line, 32P, and the more energetic states i=32D, 52S, 42D, 6s
Dynamics of Nonadiabatic Reactions. 3. Effect of Enhanced Collision Energy in F + Na2 ---> NaF + Na*
Polanyi, J. C.,Reiland, W.,Stanners, C. D.,Thomas, D. F.,Visticot, J.-P.
, p. 4723 - 4729 (1989)
A crossed-molecular-beam study has been performed of the three-center reaction F + Na2 ---> NaF + Na(i). The relative cross sections for producing many of the electronic states of Na ( states i ranging from 32P to 72P) have been measured at two collision energies 4.7 and 122.8 kcal/mol.The crosss sections decreased rapidly with increasing electronic excitation, the falloff being less steep at higher collision energy.The excitation function for populating the 32P state was measured and found to increase with increasing collision energy, suggesting tha presence of a barrier to the production of this lowest electronically excited state.The barrier height for this pathway was 4.5 kcal/mol.The excitation function for 32D, 52S, and 42D states could be inferred from the measured relative cross sections; they also increased with increasing collision energy.We have performed phase space and information theory calculations at the same level of approximation to obtain distributions over electronically excited states of sodium reaction products and have compared these with experimental results.Information theory predicts a much more rapid decrease in the cross sections with increassing electronic excitation than does the phase space theory.Comparing the experimental results with phase space theory, we find that, for enhanced reagent collision energy, the distribution of the reaction product over electronically excited states is nonstatistical.In particular the first excited state (32P) is populated at at rate an order of magnitude greater than would be expected from statistical considerations.Higher states are formed in an approximately statistical distribution.The observed dynamical bias may originate in the fact that only the 32P state can be accessed by an adiabatic pathway.
Formation of porous carbon materials with in situ generated NaF nanotemplate
Huang, Chih-Hao,Chang, Yu-Hsu,Wang, Hsiao-Wan,Cheng, Soofin,Lee, Chi-Young,Chiu, Hsin-Tien
, p. 11818 - 11822 (2006)
Porous carbon materials with pore sizes from 3 to 200 nm were synthesized by reacting hexafluorobenzene with Na liquid at 623 K. NaF crystals, a byproduct formed in the reaction, acted as nanotemplate to assist the pore formation. By employing hexafluorobenzene to react with Na incorporated within the channels (diameter 200 nm) of anodized aluminum oxide (AAO) membranes at 323-623 K, the carbon material can be fabricated into aligned porous nanotube arrays (ca. 250 nm in diameter, ca. 20 nm in wall thickness, ca. 0.06 mm in length, and ca. 3-90 nm in pore diameter). These materials were characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray energy dispersive spectroscopy, electron diffraction, thermal gravimetric analysis, and nitrogen physical adsorption experiments.
Observation of Na223Πg-13Σ +u bound-free emissions generated from Na(3p) in a reactive oxidation process
Grantier,Gole
, p. 417 - 422 (2000)
The chemiluminescent reaction products of the (Na,Na2)+Br halogenation system at concentrations in excess of 1012 cm-3 are considered. In a purely reaction driven environment evidence is obtained for the formation of the Na2 23Πg excited state and bound-free emission associated with the 23Πg-13Σu+ band system.
Complete analysis of the Na+3 fragmentation in collision with He atoms
Barat,Brenot,Dunet,Fayeton,Picard,Babikov,Sizun
, p. 233 - 238 (1999)
An experimental investigation of the fragmentation mechanisms of Na+3 cluster ions in collision with He atoms at 263 eV centre-of-mass energy is presented. The relative populations of the three fragmentation pathways are determined. In particular, the kinematics of the three-body breakup is studied in detail. The analysis of the correlation between the velocity vectors of the fragments allows one to estimate the relative role of the electronic excitation or momentum transfer in the population of each pathway. The discussion of the fragmentation dynamics is based on a concomitant theoretical study.
REACTION OF HYDRATED ELECTRONS WITH ALKALI METAL CATIONS IN ALKALINE AQUEOUS SOLUTIONS
Telser, Th.,Schindewolf, U.
, p. 5378 - 5382 (1986)
Confirming experiments of Walker et al. and Hart et al., we show by flash photolysis and pulse radiolysis that the decay of hydrated electrons in aqueous alkaline solutions leads to an intermediate which by illumination with soft UV light (λ > 250 nm) rev
Thermodynamic study of sodium-iron oxides Part II. Ternary phase diagram of the Na-Fe-O system
Huang, Jintao,Furukawa, Tomohiro,Aoto, Kazumi
, p. 67 - 72 (2003)
Studies on ternary phase diagrams of the Na-Fe-O system have been carried out from the thermodynamic point of view. Thermodynamic data of main ternary Na-Fe oxides Na4FeO3(s), Na3FeO3(s), Na5FeO4(s) and Na8Fe2O 7(s) have been assessed. A user database has been created by reviewing literature data together with recent DSC and vapor pressure measurements by the present authors. New ternary phase diagrams of the Na-Fe-O system have been constructed from room temperature to 1000 K. Stable conditions of the ternary oxides at 800 K were presented in predominance diagram as functions of oxygen pressure and sodium pressure.
Ba3N - A new binary nitride of an alkaline earth metal
Steinbrenner,Simon
, p. 228 - 232 (1998)
Reacting Ba and N2 in the stoichiometric ratio 6 : 1 at 670 K, homogenizing the product at 570 K in the presence of Na and subsequently distilling off the Na yields Ba3N. This new subnitride decomposes into Ba2N and Ba at 830 K. Its structure represents a hexagonal rod packing of Ba6/2N chains (anti-TiI3 type, space group P63/mcm; a = 764.18(2) pm, c = 705.01(5) pm; Ba in 6 g with x = 0.2721(2), N in 2 b). The peculiarity of a very spaceous packing of these rods is addressed and discussed as possibly due to a quantum size effect.
KINETICS OF IRON-SODIUM DISILICATE REACTIONS AND WETTING.
Tomsia,Pask
, p. 523 - 528 (1981)
Chemical bonding in glass-to-metal combination was investigated for maximum adherence conditions. Thermogravimetric and sessile drop measurements were used to study kinetics of redox reactions between sodium disilicate glass and iron. This study was undertaken to evaluate the nature of the reactions between iron and sodium disilicate (NS//2) as a function of time, temperature, and nature of the ambient atmosphere.