Physics Today.

نویسنده

J N Howard

چکیده

Visualizing electronic orbitals. The image of an atom is really the image of the averaged likelihood that the electrons will be at various places. Physicists at Arizona State University have now imaged the cloud of bonding electrons in copper oxide and shown that they look just the drawings used for decades in quantum physics textbooks. Using a combination of x-ray diffraction and electron diffraction (to avoid multiple x-ray scattering problems), the scientists produced a three-dimensional map (shown here) of the hybridized "orbital hole" bonding copper with neighboring oxygen atoms in cuprite (Cu2O). They also found unexpected metal-metal covalent bonding, not clearly predicted by calculations. The researchers would like to apply their technique to the more complicated CuO2 superconductors and colossal magnetoresistance manganates. (J. M. Zuo, M. Kim, M. O'Keefe, J. C. H. Spence, Nature 401, 49, 1999.)

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