title: Formation and emission characteristics of CN molecules in laser induced low pressure He plasma and its applications to N analysis in coal and fossilization study.
abstract: Presented in this paper are the results of an experimental study on the laser induced plasma emission of a number of CN free samples (urea, sucrose) with 40 mJ pulse energy using He and N₂ ambient gases. It is shown that the CN emission has its exclusive sources in the molecules produced as the result of chemical bonding either between the ablated C and N ions in the He plasma or between the ablated C and dissociated N from the N₂ ambient gas. The emission intensities in both cases are found to have the highest values at the low gas pressure of 2 kPa. The emission in He gas is shown to exhibit the typical characteristics related to a shockwave generated excitation mechanism. The experiments using He ambient gas further demonstrate the feasible laser-induced breakdown spectroscopy application to quantitative and sensitive N analysis of coal and promising application for practical in situ carbon dating of fossils.
authors.forename: Kurnia
authors.initials: K
authors.lastname: Lahna
authors.forename: Rinaldi
authors.initials: R
authors.lastname: Idroes
authors.forename: Nasrullah
authors.initials: N
authors.lastname: Idris
authors.forename: Syahrun Nur
authors.initials: SN
authors.lastname: Abdulmadjid
authors.forename: Koo Hendrik
authors.initials: KH
authors.lastname: Kurniawan
authors.forename: May On
authors.initials: MO
authors.lastname: Tjia
authors.forename: Marincan
authors.initials: M
authors.lastname: Pardede
authors.forename: Kiichiro
authors.initials: K
authors.lastname: Kagawa
mesh_terms: D002244:Carbon / Q000032:analysis*; D003031:Coal / Q000032:analysis*; D005580:Fossils; D006371:Helium / Q000737:chemistry*; D007834:Lasers; D009584:Nitrogen / Q000032:analysis*; D058626:Plasma Gases / Q000737:chemistry*; D011312:Pressure; D013050:Spectrometry, Fluorescence; D013997:Time Factors; D014508:Urea / Q000737:chemistry
chemical_list: D003031:Coal; D058626:Plasma Gases; D006371:Helium; D002244:Carbon; D014508:Urea; D009584:Nitrogen