Carbon Isotope Separation and Molecular Formation in Laser-Induced Plasmas by Laser Ablation Molecular Isotopic Spectrometry

TitleCarbon Isotope Separation and Molecular Formation in Laser-Induced Plasmas by Laser Ablation Molecular Isotopic Spectrometry
Publication TypeJournal Article
Year of Publication2013
AuthorsDong, Meirong, Xianglei Mao, Jhanis J. Gonzalez, Jidong Lu, and Richard E. Russo
JournalAnalytical Chemistry
Volume85
Start Page2899
Issue5
Pagination2899 - 2906
Date Published03/2013
ISSN0003-2700
Abstract

Laser ablation molecular isotopic spectrometry (LAMIS) recently was reported for rapid isotopic analysis by measuring molecular emission from laser-induced plasmas at atmospheric pressure. This research utilized the LAMIS approach to study C2 molecular formation from laser ablation of carbon isotopic samples in a neon gas environment at 0.1 MPa. The isotopic shift for the Swan system of the C2 Δν = 1 band was chosen for carbon isotope analysis. Temporal and spatial resolved measurements of 12C2, 12C13C, and 13C2 show that C2 forms from recombination reactions in the plasma. A theoretical simulation was used to determine the temperature from the molecular bands and to extract the isotopic ratio of 12C/13C derived from 12C2, 12C13C, and 13C2. Our data show that the ratio of 12C/13C varies with time after the laser pulse and with distance above the sample. 12C/13C deviates from the nominal ratio (2:1) at early times and closest to the sample surface. These measurements provide understanding of the chemical processes in the laser plasma and analytical improvement using LAMIS.

DOI10.1021/ac303524d
Short TitleAnal. Chem.
DOI10.1021/ac303524d