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Photofragmentation of the fluorene cation: I. New experimental procedure using sequential multiphoton absorption
Nguyen-Thi Van-Oanh1, Pierre Désesquelles, Stéphane Douin
1Laboratoire de Photophysique Moléculaire, CNRS, Fédération de Recherche Lumière Matière, Bât 210, Université Paris-Sud XI, Orsay, France. vanoanh@lcp.u-psud.fr
The Journal of Physical Chemistry. A
|April 28, 2006
Summary
Researchers studied how fluorene cations lose hydrogen after absorbing multiple photons. They found the absorption process is non-Poissonian, providing key data on photon absorption cross sections.
Area of Science:
- Physical Chemistry
- Chemical Physics
- Molecular Spectroscopy
Background:
- Fluorene cations are studied to understand molecular dissociation dynamics.
- Multiphoton absorption is a key process in molecular photoionization.
- Understanding dissociation rates is crucial for molecular physics.
Purpose of the Study:
- Investigate the hydrogen-loss channel of fluorene cations.
- Characterize the multiphoton absorption process.
- Determine the dissociation rate constant evolution and photon absorption cross section.
Main Methods:
- Utilized a supersonic molecular beam and time-of-flight mass spectrometry.
- Prepared fluorene cations via resonantly enhanced multiphoton ionization.
- Analyzed the hydrogen-loss channel induced by sequential multiphoton absorption.
Main Results:
- Demonstrated that the multiphoton absorption process is non-Poissonian.
- Determined the absolute photon absorption cross section for fluorene cations.
- Provided insights into the dissociation dynamics of excited molecular cations.
Conclusions:
- The study elucidates the non-Poissonian nature of multiphoton absorption in fluorene cations.
- Established a method for determining dissociation rates over a broad energy range.
- Offers fundamental data for molecular photoionization and dissociation research.