کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1240251 | 969112 | 2010 | 6 صفحه PDF | دانلود رایگان |
The diode laser atomic absorption spectroscopy (DLAAS) technique has been utilized to assess the degree of optical opacity of plasma at the wavelength of the Hα-line. The plasma is produced at atmospheric conditions by focusing a 6 ns Nd:YAG laser pulse at 1.064 μm on different solid target materials including aluminum, iron and titanium as major elements as well as flat pieces of plastic and wood characterized by a high content of hydrogen. The optical depth was investigated as a function of delay times ranging from 0 to 5 μs, and at laser fluences ranging from 7 to 19 J/cm2, all at a fixed gate time of 1 μs. The results show that the plasma associated with metallic targets is almost optically thin at the Hα-line over all fluences and at delay times ≥ 1 μs, but rather thick for hydrogen-rich targets (plastic and wood) over all delay times and fluences.
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 65, Issue 12, December 2010, Pages 1041–1046