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.
- Market-leading sensitivity
- 330 nm – 24 μm spectral range
- Probe delay ranges from 2 to 8 ns
- Pump pulse energies down to nJ
- Cryostat and peristaltic pump support
- 100 fs – 20 ps tunable pulse duration
- 4 mJ maximum pulse energy
- 20 W maximum output power
- Single-shot – 1 MHz repetition rate
- Automated harmonic generators (up to 5th harmonic)
- 190 fs – 20 ps tunable pulse duration
- 2 mJ maximum pulse energy
- 80 W maximum output power
- Single-shot – 2 MHz repetition rate
- Air-cooled version
- 515 nm, 343 nm, 258 nm, and 206 nm outputs
- Simple selection of active harmonic
- Simultaneous or switchable outputs
- Customizable or high-power and -energy models
2D matrix engineering for homogeneous quantum dot coupling in photovoltaic solids
J. Xu, O. Voznyy, M. Liu, A. R. Kirmani, G. Walters, R. Munir, M. Abdelsamie, A. H. Proppe, A. Sarkar, F. P. G. de Arquer et al., Nature Nanotechnology 6 (13), 456-462 (2018).