11. Laser Induced Opto Acoustic Spectroscopy (LIOAS) Setup

Technique 

The sample is excited with a ns laser pulse. Relaxation to the ground state leads to a rapid heat dissipation resulting in a pressure wave which is recorded by a fast microphone. The characteristics of this wave carry information on slowly decaying excited states.

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Units

Q-switched Nd-YAG laser system with optical parametric oscillator, detection.

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Instrument type

Homemade

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Complexity level

Medium

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Applications

This instrument provides indirect evidences for the presence and energy or quantum yield for the population of long lived excited states (e.g. triplet) which decay non-radiatively to the ground state.