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Onset of carbon cluster formation inferred from light emission in a laser-induced expansion

1991; American Physical Society; Volume: 66; Issue: 11 Linguagem: Inglês

10.1103/physrevlett.66.1430

1092-0145

P. Monchicourt,

Diamond and Carbon-based Materials Research

Space-time analysis of the light emitted from C, ${\mathrm{C}}_{2}$, and ${\mathrm{C}}_{3}$ has been performed in a laser-evaporated carbon expansion. The measured propagation velocities and concentration evolutions display the aggregation process as a half-collision governed by momentum conservation. ${\mathrm{C}}_{2}$ and ${\mathrm{C}}_{3}$ clusters are produced with strong electron excitation, the energy excess of which is removed by photon emission instead of collisional cooling.