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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 23, Number 2
BKCSDE 23(2)
February 20, 2002

Title	Mass Spectrometric Study of Carbon Cluster Formation in Laser Ablation of Graphite at 355 nm
Author	Young-Mi Koo, Young-Ku Choi, Kee Hag Lee, Kwang-Woo Jung
Keywords	Graphite, Clusters, Laser ablation, Time-of-flight mass spectrometry.
Abstract	The ablation dynamics and cluster formation of C_n⁺ ions ejected from 355 nm laser ablation of a graphite target in vacuum are investigated using a reflectron time-of-flight (RTOF) mass spectrometer. At low laser fluence, odd-numbered cluster ions with 3 ≤ n ≤ 15 are predominantly produced. Increasing the laser fluence shifts the maximum size distribution towards small cluster ions, implying the fragmentation of larger clusters within the hot plume. The temporal evolution of C_n⁺ ions was measured by varying the delay time of the ion extraction pulse with respect to the laser irradiation, providing significant information on the characteristics of the ablated plume. Above a laser fluence of 0.2J/cm² , large cluster ions (n ≥30) are produced at relatively long delay times, indicating that atoms or small carbon clusters aggregate during plume propagation. The dependence of the intensity of ablated C_n⁺ ions on delay time after laser irradiation shows that the most probable velocity of each cluster ion decreases with cluster size.
Page	309 - 314
Full Text	PDF

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