Stokes位移是指分子的荧光发射波长总比其相应的磷光发射波长要长。

Which of the following group can enhance fluorescence intensity（）。

A.—NH₂
B.—COOH
C.—NO₂
D.—NO

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Which factor has no effect on the fluorescence quantum yield molecule（）。

A.molecular structure
B.the presence of heavy atoms
C.the concentration of the solution
D.the temperature of solution

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