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Updated: May 10, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

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Published on: March 30, 2017

Communication: Optical cooling of trans-stilbene.

S A Kovalenko1, A L Dobryakov, E Pollak

  • 1Department of Chemistry, Humboldt-Universität zu Berlin, Berlin, Germany. skovale@chemie.hu-berlin.de

The Journal of Chemical Physics
|July 5, 2013
PubMed
Summary
This summary is machine-generated.

Trans-stilbene molecules in solution exhibit distinct vibrational behaviors. Excitation without excess energy leads to cooling, while high energy excitation results in solvent-mediated cooling, impacting photoreaction rates.

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Area of Science:

  • Photochemistry
  • Molecular Spectroscopy
  • Physical Chemistry

Background:

  • Trans-stilbene is a key molecule for studying photochemical reactions.
  • Vibrational energy relaxation dynamics in solution are crucial for understanding reaction pathways.

Purpose of the Study:

  • To investigate the vibrational energy dynamics of trans-stilbene in n-hexane after photoexcitation.
  • To elucidate the role of solvent-molecule interactions in vibrational cooling and heating processes.

Main Methods:

  • Time-resolved Raman spectroscopy with ~100 fs resolution.
  • Excitation of trans-stilbene with varying amounts of excess vibrational energy (0-7000 cm(-1)).

Main Results:

  • Molecules excited with high excess energy initially show broad Raman linewidths that narrow over picoseconds due to solvent cooling.
  • Molecules excited without excess energy exhibit narrow linewidths that broaden over picoseconds due to solvent heating.
  • The nascent excited state population is colder than the solvent when excited without excess energy.

Conclusions:

  • Solvent collisions play a significant role in modulating the vibrational energy of photoexcited trans-stilbene.
  • Initial vibrational energy in the excited state can influence subsequent photoreaction rates, particularly in non-polar solvents.