picoTAS

TRANSIENT ABSORPTION SPECTROMETER with pico second resolution

APPLICATIONS

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
Quantum-Dot
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.

SPECIFICATIONS

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

Source	passive Q-SW microchip laser	picosecond mode-locked laser
Wavelength	532 nm and/or 355 nm	532 nm and/or 355 nm and/or 266 nm
Pulse Width	<350 ps	<25 ps
Pulse Energy	>20 μJ	>80 μJ
Repetition Rate	100–1000 Hz (variable)	1000 Hz

Probe Light Source

Source	picosecond Supercontinuum Light Source
Pulse Width	<50–100 ps (dependent on wavelength)
Repetition Rate	20 MHz ± 5%

PC & Software

OS	Windows® 10
Function	Automatic 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

Brochure