判断题有激发光照射时,苯酚在pH=1时无荧光发射,在pH=13时有荧光发射。
判断题提高共轭度有利于增加化合物的荧光量子产率并产生红移。
判断题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。
单项选择题Which of the following group can enhance fluorescence intensity()。
A.—NH2 B.—COOH C.—NO2 D.—NO
单项选择题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