瞬态吸收光谱
瞬态吸收(TA)实验能够对光激发样品的随时间变化的吸收情况进行定量表征。该实验需要两束光脉冲:一束是飞秒窄带宽泵浦脉冲,用于激发样品;另一束是延迟的宽带宽探测脉冲,用于测量样品透射率的变化。所得到的差分吸收信号会作为探测波长以及泵浦脉冲与探测脉冲之间时间延迟的函数被测量。
瞬态吸收光谱比稳态吸收光谱或荧光衰减光谱等要复杂得多。它不仅能提供系统激发态的信息,还能给出基态和激发态中所有中间演化瞬态以及非辐射态的相关信息。
在 HARPIA-TA 系统中,瞬态吸收实验可以轻松进行定制,从而更深入地了解光活性系统的超快动力学特性。例如,测量瞬态反射而非吸收,能提供更多关于材料表面光动力学的细节;进行泵浦强度分辨吸收实验,有助于估算湮灭和饱和过程;使用不同的线偏振或圆偏振泵浦脉冲开展瞬态吸收实验,则可以获得分子聚集特性或与分子水平手性相关的光谱。
当瞬态光谱学不足以满足需求时,HARPIA-TA 光谱仪可以进行扩展,分别借助 HARPIA-TB 模块和 HARPIA-TF 模块来开展时间分辨多脉冲光谱学和荧光光谱学实验。
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瞬态吸收光谱
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