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Fiber-, bundle-, and chrysanthemum-like extra fine salicylic acid crystallites were prepared by neutralization method in the presence of polyvinyl pyrrolidone, citric acid, polyethylene glycol, and Tween-80 as modifiers, respectively. The bundle- and chrysanthemum-like extra fine salicylic acid crystallites were composed of leaf-like primary salicylic acid crystallites. The morphologies of the resultant...
The reciprocity method is applied to calculate the emission cross section of Yb 3+ in glasses, the error in σ em being less than ±15%. The effect of radiation trapping is quantitatively evaluated by the parameter [(I /I p I s ) c -(I p /I s ) m ]/(I p /I s ) c , and fluorescence lifetime is determined...
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