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Diagnostics of laser-ablated carbon plumes by photoionization using a tunable laser (1999)

Kawashima, T. ; Sasaki, K. ; Wakasaki, T. ; [et al.]

Springer

Applied physics 69 (1999), S. S767

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ISSN: 1432-0630

Keywords: PACS: 36.40.Sx; 61.46.+w; 81.15.Fg

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract. Tunable laser pulses at wavelengths from 250 to 880 nm were fired at plumes produced by laser ablation of a carbon target in He atmosphere. We observed an electrical current due to photoionization, which roughly reflected the behavior of carbon clusters in the plume. The photoionization current had dynamic temporal variations, comprising a rapid increase at the beginning (TD〈0.2 ms, where TD is the time after a YAG laser pulse for laser ablation irradiates the target), a gradual increase for 0.2〈TD〈3 ms, and a slow decrease for TD〉7 ms. The increasing phase of the photoionization current was synchronized with the decreasing phase of C2 radical density. For He gas pressures lower than 0.8 Torr no photoionization current was detected. The growth rate of the photoionization current was higher for a higher He gas pressure.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s003390051525

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Distributions of C2 and C3 radical densities in laser-ablation carbon plumes measured by laser-induced fluorescence imaging spectroscopy (2002)

Sasaki, K. ; Wakasaki, T. ; Matsui, S. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 91 (2002), S. 4033-4039

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: We measured temporal variations of the distributions of C2 and C3 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 C2 and C3 contained in plumes were evaluated by integrating the density distributions. The experimental observations have shown that the gas-phase production of C2 is comparable to the direct production from the target, while C3 is mainly produced in gas phase by three-body reactions between C and C2. In addition, we have discussed a scenario for the temporal evolution of heavy clusters (Cn with n≥4). The present results are useful for understanding initial formation processes of carbon clusters in laser-ablation plumes. © 2002 American Institute of Physics.