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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

Spectral quantum beating in mixed frequency/time-domain coherent multidimensional spectroscopy.

Andrei V Pakoulev1, Mark A Rickard, Nathan A Mathew

  • 1Department of Chemistry, University of Wisconsin, Madison, WI 53706, USA.

The Journal of Physical Chemistry. A
|July 14, 2007
PubMed
Summary

This study reveals spectral quantum beating in nickel tricarbonyl chelate by exciting two quantum states simultaneously. The observed beating pattern, influenced by excitation pulse width, offers insights into molecular dynamics.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Quantum Mechanics

Background:

  • Coherent multidimensional spectroscopy probes molecular dynamics by exciting and monitoring quantum states.
  • Simultaneous excitation of closely spaced quantum states can lead to observable quantum beating phenomena.
  • Spectral and temporal quantum beating manifest as changes in spectral lines and signal decay over time.

Purpose of the Study:

  • To investigate spectral quantum beating in a molecular system with nearly degenerate states.
  • To analyze the influence of excitation pulse characteristics on quantum beating.
  • To utilize triply vibrationally enhanced four-wave mixing for observing these dynamics.

Main Methods:

  • Performing coherent multidimensional spectroscopy in the mixed frequency/time domain.
  • Utilizing a nonrephasing, ground state bleaching coherence pathway.
  • Employing triply vibrationally enhanced four-wave mixing (TVE-FWM).
  • Varying the time delay between excitation pulses.

Main Results:

  • Observed spectral quantum beating between two nearly degenerate asymmetric carbonyl stretch modes.
  • The quantum beating exhibited line broadening and splitting, dependent on excitation pulse spectral width.
  • The observed phenomena evolved with the changing time delay between excitation pulses.

Conclusions:

  • Coherent multidimensional spectroscopy effectively reveals spectral quantum beating in systems with closely spaced energy levels.
  • The spectral width of excitation pulses plays a critical role in the manifestation of quantum beating.
  • This technique provides a sensitive method for studying vibrational dynamics in transition metal complexes.