Optical spectroscopy of emission from CN plasma formed by laser ablation

Abstract

The characterization of a plasma plume is a key issue in laser ablation and deposition studies. The formation, composition and propagation of laser-produced plasmas used for pulsed laser deposition (PLD) of CN have been studied under film growth conditions. The plume was generated by focusing 1064 nm, 9 ns pulses from Nd:YAG laser on carbon target under nitrogen ambient. We investigated the different species, such as CII, CI, C 2 , NII and CN, in laser ablated CN plasma using optical emission spectroscopy. The spectral characteristics of the plasmas were measured to determine the plasma properties as gas pressure was changed from 10 −5 to 90 mTorr. The intensities of molecular species did not depend on gas ambient whereas ion intensities did. The vibrational temperature shows dependence with gas pressure.

Laser-Induced Breakdown Spectroscopy (LIBS) of Organic Compounds: A Review

“…The CN violet system continues to be studied from numerous perspectives because of its occurrence in many emission sources. 62–66 In particular, many investigations have used optical emission spectroscopy of the violet system bands 67 to diagnose plasma parameters, 68 to determine any influence of the organic material’s molecular structure on the observed emissions from CN species, and to examine the influence of the excitation parameters on their formation, temporal and spatial dynamics, 69,70 and their sensitivity to the composition and pressure of the background gas. 71 These findings serve as a framework to understand the events taking place and also to clarify the formation mechanisms involved in laser ablation of organic materials.…”

Spectroscopic analysis of coal plasma emission produced by laser ablation

“…Therefore, plasma diagnostics of coal mineral can provide valuable information about the reaction mechanisms that are involved in combustion and gasification processes [6]. Otherwise, studies of the influence of sample morphology on laser ablation of coal, comparing both temperature and electron density of the coal plasma with the different particle size have been done [7]. Moreover, morphological changes of pulverized coal have been analyzed in [8].…”

Dynamics of C2 formation in laser-produced carbon plasma in helium environment

“…Laser ablation has the unique advantage that most of the molecules are formed in their excited states, and hence, spectroscopic measurements offer an excellent means to investigate their evolution and dynamics. 9,10 Hence, LPP evolution and its species dynamics have been studied and monitored extensively in the past using various spectroscopy diagnostic tools; among these techniques are optical emission spectroscopy (OES), 11,12 laser-induced florescence (LIF), 13 optical emission spectroscopy time-of-flight measurements, 14,15 and fast intensified charge coupled device (ICCD) photography. [16][17][18][19] In this article, we report on the dynamics of C 2 species in laser ablated carbon plumes using emission spectroscopy and monochromatic fast photography.…”