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Related Experiment Video

Updated: Aug 12, 2025

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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Pulse overlap ambiguities in multiple quantum coherence spectroscopy.

Ulrich Bangert, Lukas Bruder, Frank Stienkemeier

|February 1, 2023

Summary

This summary is machine-generated.

Ultrafast spectroscopy can be affected by pulse overlap. We found that arbitrary pulse ordering creates parasitic coherences that last longer than expected, impacting data interpretation.

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Last Updated: Aug 12, 2025

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Area of Science:

Physical Chemistry
Quantum Optics
Spectroscopy

Background:

Coherent two-dimensional electronic spectroscopy (2D ES) is a powerful technique for studying ultrafast dynamics.
Femtosecond laser pulses are used, and their duration can influence the dynamics observed.
Pulse overlap effects can complicate the interpretation of experimental results, especially when dynamics occur on similar timescales as pulse duration.

Purpose of the Study:

To investigate the impact of pulse overlap effects on experimental data in coherent spectroscopy.
To analyze the formation and characteristics of coherences arising from arbitrary temporal pulse ordering.
To understand the implications for interpreting results from two-dimensional electronic spectroscopy and related techniques.

Main Methods:

Performed one-dimensional coherence scans.
Studied pulse overlap effects in well-defined two-level systems.
Analyzed the resulting coherences and their lifetimes.

Main Results:

Observed parasitic multiple-quantum coherences due to arbitrary temporal pulse ordering during overlap.
Found that these unexpected coherences exhibited lifetimes significantly longer than the pulse coherence time (1.85 times longer).
Demonstrated that pulse overlap effects can introduce artifacts that are not immediately apparent.

Conclusions:

Arbitrary temporal ordering during pulse overlap in coherent spectroscopy can lead to artifactual coherences.
The observed coherence lifetimes exceeding pulse coherence time have significant implications for data analysis.
Careful consideration of pulse overlap effects is crucial for accurate interpretation of higher-order coherent 2D electronic spectroscopy experiments.