The colour of the gem minerals is the result of d electron transition of the groups of transition ions which are in the act of the crystal field.

The UV-Vis spectrum investigation was made on a series of the low valence dinuclear complexes, especially for λ>300nm, it is for d-d electron transition character.

These camouflage protective functions may be attributed to the electronic transition of a-naphthaquinone in lithospermum erythro.

The fittings suggest the absorption in the near IR region is ascribed to at least two electronic transition,i.

The results also show that there are electronic transitions Fe 3+ (3d) →Ce 3+ (4f) that may be the origin of transition centers of 1.

In this paper, the electron transition spectra characteristic of rare earth complexes was expatiated, and actuality of research was summarized.

This paper discusses the essence of compounds' coloration with d-d electron transition and charge transfer of transition metal ions and some affecting factors.

By means of living example, this thesis analyses the internal factors from the substance structure synthetically-various forms of electron transition, etc.

With dx(x = 1-9) structure of the transition metal complexes are light,d track transitions,in d-d transitions.

This paper uses point charge model,adjusts the value of R1 and R2,to theoretically explain the absorption spectrum of Cr5+ in the alkali lead borotellurite glass,identifies some major peaks in the results of the experiment,and calculates d-d transition and g-factor.