Abstract
Previously attempted optical methods to study the expansion of a laser-ablated plume have relied on emission/absorption time-of-flight (TOP) profiles of atoms or ions.1,2 However, different transitions of the same atomic or ionic species can exhibit misleading differences in velocities and velocity distributions/ as shown in Fig. 1. Besides, the temperature obtained based on a shifted Maxwellian fit to such a TOP profile is artificially large due to the line-of-sight integration effect intrinsic to two-dimensional fluorescent imaging of a three-dimensional plume. The solution to these problems is a direct determination of plasma temperatures using the line intensity ratio method.
© 1996 Optical Society of America
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