Characterization of ground‐state neutral and ion transport during laser ablation of Y1Ba2Cu3O7−xusing transient optical absorption spectroscopy

1989 ◽  
Vol 55 (22) ◽  
pp. 2345-2347 ◽  
Author(s):  
D. B. Geohegan ◽  
D. N. Mashburn
Keyword(s):  
Laser Ablation ◽  
Optical Absorption ◽  
Ion Transport ◽  
Absorption Spectroscopy ◽  
Ground State ◽  
Optical Absorption Spectroscopy

Optical Absorption Spectroscopy of DNA-Wrapped HiPco Carbon Nanotubes

2019 ◽  
Vol 943 ◽  
pp. 95-99
Author(s):  
Li Jun Wang ◽  
Kazuo Umemura
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Optical Characterization ◽  
Optical Absorption Spectroscopy ◽  
Double Stranded Dna

Optical absorption spectroscopy provides evidence for individually dispersed carbon nanotubes. A common method to disperse SWCNTs into aqueous solution is to sonicate the mixture in the presence of a double-stranded DNA (dsDNA). In this paper, optical characterization of dsDNA-wrapped HiPco carbon nanotubes (dsDNA-SWCNT) was carried out using near infrared (NIR) spectroscopy and photoluminescence (PL) experiments. The findings suggest that SWCNT dispersion is very good in the environment of DNA existing. Additionally, its dispersion depends on dsDNA concentration.

Use of optical absorption spectroscopy for the characterization of an Ar−Ti magnetron discharge

2007 ◽  
Vol 13 (6) ◽  
pp. 483-488 ◽  
Author(s):  
Nikolay Britun ◽  
Mireille Gaillard ◽  
Yong Mo Kim ◽  
Kab Seog Kim ◽  
Jeon-Geon Han
Keyword(s):  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Optical Absorption Spectroscopy ◽  
Magnetron Discharge

scholarly journals Characterization of Ground State Neutral and Ion Transport During Laser Ablation of 1:2:3 Superconductors by Transient Optical Absorption Spectroscopy

1989 ◽  
Vol 169 ◽  
Author(s):  
David B. Geohegan ◽  
Douglas N. Mashburn
Keyword(s):  
Laser Ablation ◽  
Optical Absorption ◽  
Ground State ◽  
Velocity Component ◽  
Film Growth ◽  
Growth Conditions ◽  
Optical Absorption Spectroscopy ◽  
Low Velocity ◽  
Ion Probe ◽  
Order Of Magnitude

AbstractOptical absorption in the plume produced by excimer laser ablation of Y1Ba2Cu3O7‐x under film growth conditions has been observed for the first time and used to characterize the transport of ground state Y, Ba, and Cu neutrals as well as Y+ and Ba+ ions. Spatially and temporally resolved absorption measurements (0.6 mm, 20 ns resolution) indicate significant ground state number densities at times following the laser pulse that are up to an order of magnitude longer than the duration of fluorescence from excited states. Time‐of‐flight absorbance profiles result in velocity distributions that are broadened significantly toward lower velocities and reveal a low velocity component (<10 5 cm s_1) to the ablation process which is not observed using emission spectroscopy. Electric ion probe measurements of the time dependence of Y+ ions confirm the existence of the new, slow velocity component. Electron densities >1016 cm‐3 in the white plasma close to the pellet have been estimated using spectrally broadened emission lines. The effects of oxygen ambient pressures and the detection of YO, BaO, and CuO also are reported. This technique is applicable as an situ monitor of the kinetic energy of ablated species during low temperature deposition of epitaxial 1:2:3 superconducting thin films.

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