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Radiative cooling of cationic carbon clusters, CN+, N = 8, 10, 13-16.

F-Q Chen1, N Kono, R Suzuki

  • 1School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China.

Physical Chemistry Chemical Physics : PCCP
|January 9, 2019
PubMed
Summary
This summary is machine-generated.

Highly excited carbon cluster cations cool rapidly via radiative cooling. Cooling rates vary with cluster size, peaking at N=8 and minimizing at N=13, indicating stabilization through photon emission.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Spectroscopy

Background:

  • Carbon clusters are fundamental building blocks in various chemical processes.
  • Understanding their stability and energy dissipation is crucial for chemical synthesis and astrophysics.
  • Radiative cooling is a key mechanism for energy loss in excited molecular systems.

Purpose of the Study:

  • To investigate the radiative cooling dynamics of highly excited carbon cluster cations.
  • To determine the size-dependent cooling rate constants for specific carbon cluster sizes.
  • To elucidate the role of electronic excitation in the cooling process.

Main Methods:

  • Experiments were conducted using an electrostatic storage ring.
  • Radiative cooling rates were measured for carbon cluster cations (CN+) with N = 8, 10, 13-16.
  • Cooling rate constants were analyzed as a function of cluster size.

Main Results:

  • Cooling rate constants were found to vary significantly with cluster size.
  • A maximum cooling rate of 2.6 × 104 s-1 was observed at N = 8.
  • A minimum cooling rate of 4.4 × 103 s-1 was observed at N = 13.
  • High cooling rates suggest photon emission from electronically excited states.

Conclusions:

  • Radiative cooling is an efficient stabilization mechanism for excited carbon cluster cations.
  • The observed size-dependent cooling rates highlight the influence of cluster structure on energy dissipation.
  • Photon emission from electronic transitions plays a significant role in stabilizing these molecular ions.