微分谱 meaning in English

differential spectrum

From absorption spectra and the second - order derivative spectra , three absorption speaks of excitons were clearly resolved . at the same time , the first exciton absorption peak got stronger with decreasing nanocrystals size . blue shifts due to quantum confinement were observed obviously
纳晶吸收谱及二次微分谱的测量结果表明，纳晶在室温出现了三个激子吸收峰，第一激子吸收峰随纳晶半径减小而增强，同时清楚地观察到纳晶受限导致的光谱蓝移。