Nanoscore GmbH





Observation of Transient Absorption Spectra of Excited Singlet/Triplet State
Measurement of Intersystem Crossing (ISC) Rate
Research of Electron Transfer, Charge Separation/Recombination Dynamics
Observation of Intermolecular Reaction, Excimer Generation etc.
Dynamics of Artificial Photosynthesis, Solar Energy Cell, Organic EL
Photon stimulated reactions
Organic Solar Cell,
Organic and molecular electronics
Fluorochrome-Labeled DNA

What is TAS?

Transient Absorption Spectroscopy (TAS) is a high-speed time resolved absorption measurement. A pulsed light (pump light) excites the target material. The subsequent processes are observed by time resolved spectroscopic analysis. In contrast to fluorescence spectroscopy, TAS can explore non-fluorescent reactions over a wide time regime such as short-lived radical species, intermediate and charge transfer states.

Why use picoTAS?

picoTAS has some distinct advantages over conventional transient absorption techniques. Other than the “Pump & Probe” method or the “Nanosecond Flash Photolysis” method, picoTAS can measure from the pico second regime to milli seconds. And it can detect fluorescent and non-fluorescent intermediates.
picoTAS has an ingenious way to remove overlaying luminescence signal and can obtain an accurate transient absorption (TA) signal of i.e. excited singlet and triplet states.


Models picoTAS-ns picoTAS-ps
Method RIPT method (Randomly Interleaved Pulse Train method)
Time Resolution (10%–90% rise time) <400 ps <100 ps
Delay Time resolution 10 ps, 20 ps, 50 ps, 100 ps, 200 ps, 500 ps, 1 ns, 2 ns, 5 ns, 10 ns, 20 ns
Full scale 100 ns–2 ms
Wavelength Range 410–1600 nm
Automatic Control wavelength scan, light intensity adjustment, shutter control
Sample Holder solution (optical path length is 2 mm), thin film
Pump Light Source
Sourcepassive Q-SW microchip laserpicosecond mode-locked laser
Wavelength532 nm and/or 355 nm532 nm and/or 355 nm and/or 266 nm
Pulse Width<350 ps<25 ps
Pulse Energy>20 μJ>80 μJ
Repetition Rate100–1000 Hz (variable)1000 Hz
Probe Light Source
Sourcepicosecond Supercontinuum Light Source
Pulse Width<50–100 ps (dependent on wavelength)
Repetition Rate20 MHz ± 5%
PC & Software
OSWindows® 10
FunctionAutomatic reconstruction of transient absorption temporal profile, curve fitting (nonlinear least square method), data storage in text format
Installation Requirement optical bench not required optical bench required