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A study of Si‐L and O‐K ELNES in plant material: SiO2, Ca‐ and Zn‐silicate in Minuartia

The formation of vacuolar precipitates containing silicon and calcium, as well as the accumulation of metal‐silicates in cell walls of Minuartia has been investigated by electron microscopy, energy‐dispersive X‐ray analysis and electron spectroscopic imaging. The bond state of the elements concerned is examined by analysing energy‐loss near‐edge structures (ELNES), particularly the Si‐L2,3 and the O‐K ELNES. Experimental ELNES results are compared with local densities of unoccupied states calculated by molecular orbital methods and results of XANES calculations.