Spectroscopic investigation of molecular formation in laterally colliding laser-produced carbon plasmas
- 16 January 2019
- journal article
- research article
- Published by Optica Publishing Group in Applied Optics
- Vol. 58 (3), 561-570
- https://doi.org/10.1364/ao.58.000561
Abstract
We report detailed spectroscopic investigation of carbon dimer production in the stagnation layer formed due to laterally colliding plasma plumes under vacuum and ambience. Two spatially separated Nd:YAG laser pulses are used to generate plasma plumes in close proximity to a solid graphite target. A comparative optical emission spectroscopic study of a stagnation layer and a single carbon plasma plume is carried out in order to find the optimum experimental conditions for carbon dimer () production. Significant enhancement in the production is observed in the stagnation layer as compared to that observed in the single plume. Further, a substantial increase in carbon dimer formation is monitored by introducing gas. Along with carbon dimer, carbon nitride (CN) emission is also observed in the emission spectra. Spatiotemporal evolution of and CN emission reveals that the yield of carbon dimer production is at a maximum close to the target surface, and decreases with an increase in time as well as spatial position. On the contrary, CN emission increases with the target distance. The dominant pathways for CN formation are suggested, and it is demonstrated that acts as a precursor to CN formation. The above observation is correlated with cooling of ejected carbon species in the collisional regime and the estimated vibrational temperature of .
This publication has 40 references indexed in Scilit:
- Laser produced plasma sources for nanolithography—Recent integrated simulation and benchmarkingPhysics of Plasmas, 2013
- Generation of various carbon nanostructures in water using IR/UV laser ablationJournal of Physics D: Applied Physics, 2013
- Colliding plasma experiments to study astrophysical-jet relevant physicsAstrophysics and Space Science, 2009
- High-resolution investigations of C2and CN optical emissions in laser-induced plasmas during graphite ablationJournal of Physics B: Atomic, Molecular and Optical Physics, 2002
- Charge-exchange collisions in interpenetrating laser-produced magnesium plasmasLaser and Particle Beams, 2001
- A study of molecule formation during laser ablation of graphite in low-pressure nitrogenJournal of Physics D: Applied Physics, 1998
- Carbon molecules, ions, and clustersChemical Reviews, 1989
- Recent developments for plasma edge diagnostics using atomic beamsJournal of Nuclear Materials, 1989
- C60: BuckminsterfullereneNature, 1985
- Temperature and density of an expanding laser produced plasmaPlasma Physics, 1974