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  • Updated 14 months ago
    The electronic-state configurations for molecules can be described by the primary quantum number n, the angular momentum quantum number Λ, the spin quantum number S, which remains a good quantum number, the quantum number Σ (S, S-1, ..., -S), and the projection of the total angular momentum quantum number onto the molecular symmetry axis Ω, which can be derived as Ω=Λ+Σ.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Fundamentals/Selection_rules_and_transition_moment_integral
  • Updated 14 months ago
    Through a careful study of multiple model compounds of known oxidation states and spin configurations, from Ni(I), to low- and high-spin Ni(III) up to Ni(IV), a relationship is derived between the position of the L 3 edge and the ratio of the integrals of the L 3 and L 2 edges.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/X-ray_Spectroscopy/XANES%3A_Application
  • Updated 14 months ago
    This rule states that the absorption coefficient is proportional to the square of the transition moment integral, or |<i|H|f>| 2 , where i is the unaffected core energy level before it interferes with the neighboring atoms, H is the interaction, and f is the final state in which the core energy level has been affected and a photoelectron has been ejected.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/X-ray_Spectroscopy/EXAFS%3A_Theory
  • Updated 14 months ago
    This page has no content. Enrich ChemWiki by contributing.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Kinetics/Rate_Laws/Gas_Phase_Kinetics/Bimolecular_SN2_Reactions/Rice-Ramsperger-Kassel-Marcus_(RRKM)_Model
  • Updated 14 months ago
    In order to observe resonance, the frequency of the microwaves must correspond to the splitting of the spin states of the electron, which is determined by the strength of the magnetic field. The peaks seen in figure 12 correspond to specific quantitative parameters that describe the coupling of the electron and the nucleus, thus corresponding to the distance between the nuclei and the electron.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Magnetic_Resonance_Spectroscopies/Electron_Paramagnetic_Resonance/EPR%3A_Application
  • Updated 14 months ago
    Geometry of Transition Metals Complexes Bonding in Transition Metal Complexes MO Theory of Octahedral Complexes MO Theory of Tetrahedral Complexes Electronic Properties High and Low Spin Complexes Effects of Spin States on Physiological Function: Example Hemoglobin Reactions of Transition Metal Complexes Labile and Inert Complexes Markus Theory and its Applications Unit VI: Metal Clusters Transition Metal Nanoparticles Synthesis
    http://chemwiki.ucdavis.edu/Wikitexts/UC_Davis/UCD_Chem_226
  • Updated 14 months ago
    Cut the sodium to approximately the appropriate size while there is still a small amount of oil remaining on the metal. Finely powdered sodium metal should never be handled in the open as exposure to moisture will both reduce the quality of the reagent as well as potentially cause large fires which are difficult to extinguish. To extinguish a metal fire, it is ideal to either use an appropriate Metal "Class D" fire extinguisher or to pour large quantities of SAND over the fire.
    http://chemwiki.ucdavis.edu/Reference/Lab_Techniques/Reagent_Specific_Hazards/Sodium
  • Updated 14 months ago
    The attached PDF gives a reliable method for the titration of butyl lithium, and other alkyl lithium reagents. The content was lifted from the Black Research Group and some Andy Myers lecture notes.I have added/changed the wording to make it more accessible to beginners.
    http://chemwiki.ucdavis.edu/Reference/Lab_Techniques/Reagent_Specific_Hazards/Alkyl_Lithium_Titration
  • Updated 14 months ago
    Methyl esters can be produced by dissolving the acid in methanol and adding a slight excess of TMS-diazomethane. The reaction is complete when the yellow color of the TMS-diazomethane has faded. When the reaction is complete, quench by slowly adding acetic or formic acid until the yellow color has vanished, and gas evolution ceases. TMS-diazomethane is available as a 2M solution in hexanes, but a preparation can be found in Organic Syntheses, Coll.
    http://chemwiki.ucdavis.edu/Reference/Lab_Techniques/Reagent_Specific_Hazards/TMS-Diazomethane
  • Updated 14 months ago
    Based on scattering theory, one can say that at high energy, EXAFS region, for the scattering of the photoelectron or auger electron are very weak, the main contribution of the scattering to the wave function of the final state is from the path that the excited electron is scattered only once.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/X-ray_Spectroscopy/XANES%3A_Theory/XANES%3A_Theory2
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