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Femtosecond Spectroscopy of Chemically Reactive Solids: a Methodology

Published online by Cambridge University Press:  15 February 2011

Weining Wang ,
Marc M. Wefers  and
Keith A. Nelson
Weining Wang
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139
Marc M. Wefers
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139
Keith A. Nelson
Affiliation:
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

An experimental methodology for recording femtosecond time-resolved observations of irreversible change in solids is described. The central problem posed is that the trime-dependent evolution must be observed on a single-shot (i.e. real-time) basis since the sample may be permanently altered after each excitation event. Preliminary demonstrations of real-time femtosecond spectroscopic observations are presented. In addition, one-shot data acquisition techniques open up the possibility of excitation intensities that greatly exceed optical damage threshholds of most samples. Since only one excitation pulse is used, cumulative damage mechanisms may be circumvented. Even if the sample is damaged in a single shot, in some cases the events of interest may be observed before damage occurs. The use of timed sequences of high-intensity excitation pulses to drive large-amplitude, coherent lattice vibrations is discussed. If successful, such large-amplitude lattice vibrations could assist crystalline chemical reactions or structural phase transitions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 296: Symposium Y – Structure and Properties of Energetic Materials , 1992 , 129
Copyright
Copyright © Materials Research Society 1993

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