Rosario C. Sausa, "Time-resolved imaging and optical spectroscopy of plasma plumes during pulsed laser material deposition," Appl. Opt. 56, B123-B133 (2017)
We employ fast imaging photography and emission spectroscopy to study plasma plumes resulting from the 248-nm ablation of barium strontium titanate, and we utilize x-ray diffraction analysis and scanning electron microscopy to characterize the deposited thin films. Hydrodynamic plume analyses yield initial velocities of approximately , whereas spectral simulations of the Ba I lines between 739 and 770 nm yield temperatures of approximately 17000 K at early times in vacuum. Analyses of the Stark broadened Ba II lines at 614 and 649 nm reveal an electron number density of approximately near the surface. Several Pa of oxygen reduces these values while improving the film quality.
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Clusters labeled A through H shown in Fig. 4 are assigned as follows: (A) Ti I and Ti II line clusters ; (B) Ti I lines (); (C) Ti I and Ti II lines (); (D) Ti I line cluster ; (E) Ti I and Ti II line clusters ; (F) Ti I line cluster (); (G) Ti I line cluster (); (H) Ti I line cluster ().
The following Ti lines are observed experimentally to the blue of the Ba I line, but are difficult to see in Fig. 4 because of its poor resolution: Ti I (453.3) [–]; Ti (453.48) [–]; and Ti I (453.57) [–].
Table 2.
Ba I Emissions and Corresponding Transitions in the Region between 739 and 767 nm at Reported in the Literature [42–46]
The values correspond to and .
Values obtained from a polynomial fit of the data reported by Duan et al. [49]. We excluded their value for the 614-nm transition at 30,000 K because it was not consistent with their data set.
Tables (3)
Table 1.
Emission Wavelength, Assignment, and Transition of Selected Species in Fig. 4 in the Range between 300 and 860 nma
Clusters labeled A through H shown in Fig. 4 are assigned as follows: (A) Ti I and Ti II line clusters ; (B) Ti I lines (); (C) Ti I and Ti II lines (); (D) Ti I line cluster ; (E) Ti I and Ti II line clusters ; (F) Ti I line cluster (); (G) Ti I line cluster (); (H) Ti I line cluster ().
The following Ti lines are observed experimentally to the blue of the Ba I line, but are difficult to see in Fig. 4 because of its poor resolution: Ti I (453.3) [–]; Ti (453.48) [–]; and Ti I (453.57) [–].
Table 2.
Ba I Emissions and Corresponding Transitions in the Region between 739 and 767 nm at Reported in the Literature [42–46]
The values correspond to and .
Values obtained from a polynomial fit of the data reported by Duan et al. [49]. We excluded their value for the 614-nm transition at 30,000 K because it was not consistent with their data set.
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