ISSN:
1432-0630
Keywords:
PACS: 52.25.Qt; 52.50.Jm; 52.70.Kz
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract. Optical absorption spectroscopy in combination with laser-induced fluorescence imaging is applied to determine spatially and temporally resolved number densities within laser-produced titanium plasmas, expanding into vacuum and low-pressure nitrogen. Contour mapping of species number density and subsequent volumetric integration to yield the total number of absorbing species in the plume are demonstrated for Ti I expanding into vacuum. The results obtained indicate that for an incident KrF energy density of ∼4 J cm-2 the total plume content is 〉1017 Ti neutrals and ions. The ground-state neutral and ground-state ion yields are both observed to increase linearly with laser fluence above thresholds of ∼2.2 J cm-2 and ∼3.7 J cm-2, respectively. Reduction in absorption linewidths and spatial widening of the corresponding LIF images, observed for plume expansion in the presence of low-pressure ambient gases, reflects the reduction in species velocities and randomisation of the velocity distributions of plume species with increasing ambient pressure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003390051547
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