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Etude des mécanismes de désexcitation de C60 : ionisation retardée et émission C2

Abstract : This thesis is dedicated to the study of C60 fullerene cooling mechanisms after a nanosecond laser excitation. In this temporal mode, absorbed energy is redistributed to all cluster's degrees of freedom causing a fragmentation cascade by emission of C2 molecules. A process of delayed ionisation is highlighted for each size of produced clusters. Then the formed cations can fragment by emission of C2. Our experimental device is made of a time-resolved velocity-map imaging spectrometer combined with a Wiley-McLaren time-of-flight mass spectrometer. It allows extracting the kinetic energy spectra from the photoelectrons or photoions that result from the C60 relaxation chain. These spectra are compared with a statistical model based on Weisskopf's formalism. A Monte Carlo algorithm was developed in order to rebuild the C60 time-of-flight spectrum. The information extracted from simulations, like the internal energies or the branching ratios at each decay stage, perfectly complete the analysis of the involved processes.
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https://tel.archives-ouvertes.fr/tel-00092829
Contributor : Bruno Climen <>
Submitted on : Tuesday, September 12, 2006 - 1:17:27 PM
Last modification on : Thursday, October 15, 2020 - 9:00:22 AM
Long-term archiving on: : Monday, April 5, 2010 - 11:37:34 PM

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  • HAL Id : tel-00092829, version 1

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Bruno Climen. Etude des mécanismes de désexcitation de C60 : ionisation retardée et émission C2. Physique Atomique [physics.atom-ph]. Université Claude Bernard - Lyon I, 2006. Français. ⟨tel-00092829⟩

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