Distributions of C[sub 2] and C[sub 3] radical densities in laser-ablation carbon plumes measured by laser-induced fluorescence imaging spectroscopy

Sasaki, K.; Wakasaki, T.; Matsui, S.; Kadota, K.
April 2002
Journal of Applied Physics;4/1/2002, Vol. 91 Issue 7, p4033
Academic Journal
We measured temporal variations of the distributions of C[sub 2] and C[sub 3] radical densities in carbon plumes produced by laser ablation of graphite in ambient He gas. Laser-induced fluorescence imaging spectroscopy was used for the measurement. The temporal variations of total numbers of C[sub 2] and C[sub 3] contained in plumes were evaluated by integrating the density distributions. The experimental observations have shown that the gas-phase production of C[sub 2] is comparable to the direct production from the target, while C[sub 3] is mainly produced in gas phase by three-body reactions between C and C[sub 2]. In addition, we have discussed a scenario for the temporal evolution of heavy clusters (C[sub n] with n ≥ 4). The present results are useful for understanding initial formation processes of carbon clusters in laser-ablation plumes.


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