Comment by Phillips - Ultrafast Process
7 pages
English
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Comment by Phillips - Ultrafast Process

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7 pages
English

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Ultrafast Processes David Phillips Itryerial College Lorlu'otl. So~itlz Keri ritlgtoil, Lonclotz, UK S W7 2AZ Cornrnentary on: Picosecond jet spectroscopy and photochemistry: Energy redistribution and its impact on coherence, isomerisation, dissociation and solvation, Ahmed H. Zewail, Fumrlng Dircu~~c. Cl7e1n. Soc., 1983, 75, 3 15-330 Ultrafast techniques have really come into their own since the development over the past decade of reliable, relatively inexpensive femtosecond lasers, but in the 1980's. ~~ltrafast still meant picoseconds, and the chosen paper typifies work in this time-domain. The whole si~b,ject of course owes its inspiration to George Porter. who with Norrish pioneered flash photolysis.' first in the nlilli-, then micro-. and ultin~ately nano- and picosecond time-domains. In the 1960's and 70's. the basic theories of non-radiative decay of photo-excited molecules was put on a firm footing by the pioneering work of Hochstrasser, Jortner. Robinson and many others,' and this permitted a broad understanding of decay proces5es observed experimentally in sinlple di- and tri- atomic moleci~les through to large polyatomic systems. However almost all data o~i large molecules up to this time had been obtained in the condensed phase. or in "bulb" experiments on gases at low pressures in the so-called isolated nioleci~le limit, i.r. pressures such that collision with other tnolecules would not occur during the lifetime of the excited state. ...

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