Carroll E C, Hill M P, Madsen D, Malley K R, Larsen D S
Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, USA.
Rev Sci Instrum. 2009 Feb;80(2):026102. doi: 10.1063/1.3070516.
Time-resolved measurement of population dynamics extending over femtosecond to millisecond time scales typically requires a combination of transient absorption techniques involving different laser systems and detection schemes. The spectrometer design presented here facilitates transient absorption measurements over 12 decades with a single ultrafast laser system by picking pump and probe pulses independently from the laser oscillator pulse train. Unamplified pulses seed a photonic crystal fiber to a supercontinuum probe source for spectrally resolved measurements. The utility of the system is demonstrated by measuring triplet state dynamics following photoexcitation of vitamin B(6) in aqueous solution.
时间分辨测量跨越飞秒到毫秒时间尺度的种群动态通常需要结合涉及不同激光系统和检测方案的瞬态吸收技术。这里介绍的光谱仪设计通过从激光振荡器脉冲序列中独立选取泵浦脉冲和探测脉冲，利用单个超快激光系统实现了跨越12个数量级的瞬态吸收测量。未放大的脉冲作为种子注入光子晶体光纤，形成用于光谱分辨测量的超连续探测源。通过测量水溶液中维生素B(6)光激发后的三重态动力学，证明了该系统的实用性。
