Applications

在闪光光解模式下，使用 HARPIA 光谱系统，测量溶液中的四苯基卟吩的纳秒光谱动态 测量条件：脉冲重频 1.8 kHz, 泵浦光波长 343 nm, 泵浦光能量 5.4 μJ。

The flash photolysis experiment is designed for measuring long-lived states of molecular systems. It is extensively used to study light-induced processes in organic molecules, polymers, nanoparticles, semiconductors, as well as photosynthesis and light-induced conformational changes in plants and other biological systems.

The principle of flash photolysis is analogous to the femtosecond transient absorption (TA) experiment but with the delay in a nanosecond–microsecond range. In the femtosecond TA, the delay between pump and probe pulses is varied by moving the mechanical delay stage, while in flash photolysis, the delayed probe pulse is obtained from an electronically triggered external probe laser.

HARPIA-TA spectrometer offers an optional flash photolysis extension. Exceptional optical stability of PHAROS or CARBIDE lasers, reduction of electronic jitter, and tedious analysis of experimental data allow measuring the flash photolysis signals with sub-10 ns temporal resolution.