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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Time-resolved phase-sensitive second harmonic generation spectroscopy.

Paweł J Nowakowski¹, David A Woods¹, Colin D Bain¹

¹Department of Chemistry, Durham University, Durham, DH1 3LE, United Kingdom.

The Journal of Chemical Physics

|March 2, 2015

Summary

This summary is machine-generated.

A new phase-sensitive second harmonic generation (SHG) method reveals excited state dynamics at interfaces. This technique offers direct proportionality to concentration and independent determination of nonlinear susceptibility components.

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Area of Science:

Physical Chemistry
Surface Science
Spectroscopy

Background:

Probing excited state dynamics at interfaces is crucial for understanding chemical and physical processes.
Traditional methods like non-phase sensitive second harmonic generation (SHG) have limitations in sensitivity and data interpretation.

Purpose of the Study:

To present a novel time-resolved, phase-sensitive second harmonic generation (SHG) methodology.
To enable precise measurement of excited state dynamics and interfacial species.

Main Methods:

Utilized interference measurements between sample SHG and a reference local oscillator.
Employed lock-in detection to eliminate interference offsets.
Applied the technique to malachite green dye at the water/air interface.

Main Results:

Achieved direct proportionality between the observed signal and sample concentration.
Enabled independent determination of the real and imaginary parts of the 2nd order nonlinear susceptibility.
Demonstrated high sensitivity and rapid data acquisition for excited state dynamics.

Conclusions:

The developed phase-sensitive SHG technique is highly sensitive for interfacial studies.
It provides quantitative insights into excited state dynamics with improved accuracy.
The method offers a significant advancement for interfacial molecular dynamics research.