Chemisorption-induced spin symmetry breaking in gold clusters and the onset of paramagnetism in capped gold nanoparticles

Article Abstract:

A model is presented to describe the induction of magnetic behavior on gold clusters upon chemisorption of one organic molecule with different chemical linkers. The problem of stability of the lowest lying singlet is addressed and it shows that for some linkers there exists a spin symmetry-breaking that lowers the energy and leads to preferential spin density localization on the gold atoms neighboring the chemisorption site.

Nanoparticles

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Magnetic circular dichroism spectra for colloidal gold nanoparticles in xerogels at 5.5k

Article Abstract:

The temperature dependent magnetic circular dichroism (MCD) measurement of colloidal gold nanoparticles and Au9 ((PPh3)(sub 8))(super 3+) cluster complex ions are experimented based on a high quality optically transparent xerogels. The MCD spectra of colloidal gold in xerogel represent the signature of an excited-state phenomenon for the surface plasmon transition at 523nm and temperature independent between 5.5 and 295K.

Colloid chemistry

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Spectral fingerprints of bacterial strains by laser-induced breakdown spectroscopy

Article Abstract:

The applicability of laser-induced breakdown spectroscopy (LIBS) in fingerprinting microorganisms is described. The results illustrate the potential of the LIBS method for the rapid and low false-positive classification of bacteria with minimum sample preparation.

Microorganisms, Fingerprints, Laser photochemistry, Laser spectroscopy

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