کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5364694 1388319 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanism of ablation of CdS at laser wavelengths in the visible and in the UV
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Mechanism of ablation of CdS at laser wavelengths in the visible and in the UV
چکیده انگلیسی

The mechanisms of laser ablation of CdS targets at different laser wavelengths have been investigated. (CdS)n+ cluster formation is only observed upon 532 nm ablation. The time and energy distributions of neutral S, S2, Cd and CdS show significant dependence on laser wavelength. Bimodal distributions are observed at 266 and 308 nm. For the former, the average kinetic energy increases significantly with mass, taking values in the range of 0.3-1.7 eV. At 308 nm the slow component of the time distribution disappears at distances above the target larger than 1 cm. At this wavelength, the observed time distribution appears to reflect mainly the dynamics of the expansion. At 532 nm the time distribution is monomodal and the average kinetic energies are below 0.2 eV. Clear indications of the participation of thermal (at 532 nm) and non-thermal mechanisms (at 266 nm) have been found. It is tentatively concluded that the cluster formation observed upon ablation at 532 nm can be related to the thermal ablation mechanisms in which the low kinetic energy of the species in the plume and their similar velocities favor the aggregation processes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 253, Issue 15, 30 May 2007, Pages 6339-6342
نویسندگان
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