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Updated: Nov 24, 2025

Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
Fifth-order two-quantum absorptive two-dimensional electronic spectroscopy of CdSe quantum dots
Patrick Brosseau1, Samuel Palato1, Hélène Seiler1
1Department of Chemistry, McGill University, Montreal, Quebec H3A 0B8, Canada.
Abstract:
Two-quantum variants of two-dimensional electronic spectroscopy (2DES) have previously been used to characterize multi-exciton interactions in molecules and semiconductor nanostructures though many implementations are limited by phasing procedures or non-resonant signals. We implement 2DES using phase-cycling to simultaneously measure one-quantum and two-quantum spectra in colloidal CdSe quantum dots. In the pump-probe geometry, fully absorptive spectra are automatically acquired by measuring the sum of the rephasing and nonrephasing signals. Fifth-order two-quantum spectroscopy allows for direct access to multi-exciton states that may be obscured in excited state absorption signals due to population relaxation or third-order two-quantum spectra due to the non-resonant response.
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