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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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Fluorescence-Detected Two-Dimensional Electronic Spectroscopy of a Single Molecule.

Sanchayeeta Jana1, Simon Durst1, Markus Lippitz1

  • 1Experimental Physics III, University of Bayreuth, 95447 Bayreuth, Germany.

Nano Letters
|September 27, 2024
PubMed
Summary

We developed a new technique combining single-molecule spectroscopy and 2D spectroscopy to study ultrafast dynamics in individual dibenzoterrylene (DBT) molecules at room temperature. This method offers new insights into energy transfer in single quantum systems.

Keywords:
fluorescence-detected two-dimensional electronic spectroscopy (F-2DES)nonlinear opticssingle-molecule spectroscopy (SMS)ultrafast spectroscopy

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Quantum Optics

Background:

  • Single-molecule fluorescence spectroscopy offers high sensitivity but is limited to nanosecond temporal resolution.
  • Ensemble-averaged two-dimensional spectroscopy reveals ultrafast dynamics (femtoseconds) but lacks single-molecule specificity.
  • Bridging these techniques is crucial for understanding ultrafast processes at the single-quantum level.

Purpose of the Study:

  • To combine single-molecule detection with coherent 2D spectroscopy.
  • To achieve femtosecond temporal resolution for individual quantum emitters.
  • To investigate ultrafast energy transfer dynamics in single dibenzoterrylene (DBT) molecules.

Main Methods:

  • Utilized a confocal microscope setup for single-molecule excitation with phase-modulated femtosecond pulse trains.
  • Employed single-photon counting detectors for fluorescence detection.
  • Implemented a phase-sensitive detection scheme to measure nonlinear 2D spectra.

Main Results:

  • Successfully demonstrated coherent 2D spectroscopy on individual dibenzoterrylene (DBT) molecules at room temperature.
  • Measured nonlinear 2D spectra for a significant portion of the studied DBT molecules.
  • Achieved high temporal resolution for single quantum emitters.

Conclusions:

  • The developed method successfully combines single-molecule sensitivity with ultrafast temporal resolution.
  • This technique opens new avenues for studying energy transfer and other ultrafast phenomena in single quantum objects.
  • Applicable to a broad range of single emitters for fundamental research.