Recent content by ycheff

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    Is the O3 Molecule Polar Due to Fractional Charges and Nonlinear Geometry?

    Oxygen atoms are in different states of oxidation. Their fractional charges are different. Molecular geometry is nonlinear. Hence, dipolar momentum is non-vanishing.
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    Why is it that cocaine crystals aren't transparent

    Material also can include impurities with other refractive index.
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    D2sp3 and sp3d2 Configurations of [Cr(NH3)6]3+ Ligand Complex

    d2sp3 https://books.google.ru/books?id=7ecDAAAAMBAJ&pg=PA755&dq=d2sp3++Cr%5BNH3%5D3%2B&hl=en&sa=X&ei=T3rrVPGBM4LvywOYt4CIDA&ved=0CBMQ6AEwAA#v=onepage&q=d2sp3%20%20Cr%5BNH3%5D3%2B&f=false
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    Graduate NaLaF4:Er3+ up-conversion spectrum in glass an ceramics

    Width is wider, intensity is lower. And vice versa. Integral is approximately the same. Try to get spectra at low temperature (liquid N2) - without phonons.
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    Graduate Ferromagnetism for 3d, 4f metals

    Read here...
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    Graduate Value of L for the ground state of Vanadium (II)

    V(ii) - v+
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    Graduate Trouble Collecting IR Spectrum of a-Si:H

    Si-H bond has fundamental frequency near 4.4 μm, second harmonic - 2.25 μm, third - 1.54 μm...
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    Graduate What caused the secondary peak in our photoluminescence experiment?

    It may be QD1 and QD2 with different size dispersions.
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    Graduate Can negative dielectric possible

    Any metal has negative dielectric constant at frequencies higher then plasmon frequency.
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    Graduate Meaning of σ & π Bonds in Molecules Quantum Mechanics

    Read also: Enrico Fermi "Molecules, Crystals and Quantum Statistics".
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    Graduate How to find the ground state of He atom

    See in Schiff L.I. "Quantum mechamics"
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    Hybridized orbitals (can't understand diagram)

    1s2 - (or [He]) - closed shell. It can't hybridize. Too much energy gap between 1s and 2s.
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    Hybridized orbitals (can't understand diagram)

    B has three 2p orbitals. And one 2s. Empty orbital doesn't hybridize.
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    Graduate What Factors Influence the Lifetimes of He S=1,0 States in Quantum Mechanics?

    Hydrogen atom (H I) is analog of helium ion (He II). For He II: 22S1/2 -> 12S1/2 t > 1 msec (Bull. Amer. Phys. Soc, 1962, v. 7, p. 258)
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    Graduate What Factors Influence the Lifetimes of He S=1,0 States in Quantum Mechanics?

    I don't know value for helium ion, for hydrogen atom: 22S1/2 -> 12S1/2 t= 2 msec