Abstract
The techniques of LEED-Spot Profile Analysis (LEED-SPA) and He+ ion channeling have been used to investigate the response of molybdenum and bismuth single crystals to pulsed laser irradiation. Samples of molybdenum with (100) orientations were irradiated with a Q-switched, frequency- doubled Nd:YAG laser under ultra-high vacuum conditions. Good epitaxial regrowth of the melted surfaces was indicated by the appearance of a well-defined LEED pattern. Analysis of the spot profiles as a function of incident electron energy and annealing time at 1000°C indicates the initial formation of random island structures on the surface which coalesce toward a flat surface with prolonged heating. Samples which had been disordered in the near surface region by Ar+ ion bombardment exhibited a sharp LEED pattern after pulsed laser melting.
The (0001), (\(\bar 1\)010), and 2\(\bar 1\) \(\bar 1\)l0) surfaces of bismuth were pulsed laser melted using a Q-switched ruby laser. Channeling, Nomarski Interference Contrast microscopy (NIC), and selective chemical etching indicate that the (0001) surface regrows epitaxially with no increase indisorder after pulsed laser melting at low laser fluences. Both the (\(\bar 1\)010) and (2\(\bar 1\) \(\bar 1\)0) surfaces show a marked increase in disorder after irradiation. The responses of these metals and the data are explained using a thermomechanical stress model in which the materials plastically deform in response to the high thermal gradients induced during pulsed laser irradiation.
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© 1986 Martinus Nijhoff Publishers, Dordrecht
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Helms, A.L., Cho, CC., Bernasek, S.L., Draper, C.W., Jacobson, D.C., Poate, J.M. (1986). Defect Structures on Metal Surfaces Induced by Pulsed Laser Irradiation: Characterization by Leed-Spot Profile Analysis and He+ Ion Channeling. In: Draper, C.W., Mazzoldi, P. (eds) Laser Surface Treatment of Metals. NATO ASI Series, vol 115. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4468-8_15
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