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Related Experiment Videos

Energy distributions in multiple photon absorption experiments.

K Mehlig1, K Hansen, M Heden

  • 1Department of Experimental Physics, Goteborg University and Chalmers University of Technology, SE-41296 Goteborg, Sweden.

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

The Poisson distribution approximation for photon absorption in molecular fragmentation fails with realistic laser beams. Our calculations reveal a power-law energy distribution for Gaussian beams, crucial for understanding fullerene and carbon cluster fragmentation.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Molecular Dynamics

Background:

  • Molecular fragmentation experiments often involve multiphoton absorption.
  • Poisson distributions are commonly used to model photon absorption but are inaccurate for realistic laser profiles.
  • Spatial variations in laser beams significantly affect photon absorption distributions.

Purpose of the Study:

  • To calculate the distribution of absorbed energy in molecules undergoing photofragmentation.
  • To investigate the limitations of the Poisson distribution approximation for realistic laser beam profiles.
  • To analyze the impact of laser and molecular beam parameters on energy absorption.

Main Methods:

  • Development of a theoretical model to calculate absorbed energy distributions.

Related Experiment Videos

  • Simulation of photofragmentation with Gaussian laser beam profiles.
  • Analysis of energy distributions for varying laser and molecular beam parameters.

    • Main Results:

    • The spatially averaged absorbed energy distribution for a Gaussian laser beam exhibits power-law behavior at low energies.
    • A cutoff energy is observed, proportional to laser fluence.
    • The power-law exponent varies between -1 and -5/2 depending on beam parallelism.

    Conclusions:

    • The Poisson approximation is inadequate for realistic laser-induced molecular fragmentation.
    • The calculated power-law energy distributions provide a more accurate model.
    • Experimental fullerene and carbon cluster abundance spectra validate the model for reconstructing internal energy distributions in excited C60.