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Laser Ablation Molecular Isotopic Spectrometry for Molecules Formation Chemistry in Femtosecond-Laser Ablated Plasmas

Journal Article · · Analytical Chemistry
 [1];  [2];  [2];  [3]
  1. Peac Inst. of Multiscale Sciences, Chengdu, Sichuan (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Applied Spectra, Inc., Fremont, CA (United States)

Recently, laser ablated molecular isotopic spectrometry (LAMIS) has expanded its capability to explore molecules formation mechanism in laser-induced plasma in addition to isotope analysis. LAMIS is a powerful tool for tracking the origination of atoms that is involved in formation of investigated molecules by labeling atoms with their isotopic substitution. The evolutionary formation pathways of organic molecules, especially of C2 dimers and CN radicals, were frequently reported. However, very little is known about the formation pathways for metallic radicals and heterodimers in laser ablated plasma. This research focuses on elucidating the formation pathways of AlO radicals in femtosecond laser ablated plasma from 18O-labeled Al2O3 pellet. Plasmas expanding with strong forward bias in the direction normal to the sample surface were generated in the wake of a weakly ionized channel created by a femtosecond laser. The formation mechanism of AlO and influence of air were investigated with multiple plasma diagnostic methods such as monochromatic fast gating imaging, spatiotemporal resolved optical emission spectroscopy, and LAMIS. An advanced LAMIS fitting procedure was used to deduce the spatiotemporal distributions of Al18O and Al16O number densities and also their ratios. We found that the Al16O/Al18O number density ratio is higher for plasma portion closer to the sample surface, which suggests that chemical reactions between the plasma plume and ambient air are more intense at the tail of the plasma. The results also reveals that direct association of free Al and O atoms is the main mechanism for the formation of AlO at the early stage of the plasma. Finally, to the contrast, chemical reactions between plasma materials and ambient oxygen molecules and the isotope exchange effect are the dominant mechanisms of the formation of AlO and evolution of Al16O/Al18O number density ratio at the late stage of the plasma.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1479321
Journal Information:
Analytical Chemistry, Journal Name: Analytical Chemistry Journal Issue: 14 Vol. 89; ISSN 0003-2700
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Mass spectrometric analysis of the Mg plasma produced by double-pulse femtosecond laser irradiation journal January 2018
Spatial and temporal distribution of metal atoms and their diatomic oxide molecules in femtosecond laser-induced plasmas journal January 2018
Optical spectroscopy of laser-produced plasmas for standoff isotopic analysis journal June 2018
Influence of distance between sample surface and geometrical focal point on CN emission intensity from femtosecond laser-induced PMMA plasmas journal July 2019
Compressed Ultrafast Spectral-Temporal Photography journal May 2019
Vibrationally-resolved excitation and dissociation collision strengths of AlO+ by electron-impact using the R-matrix method journal July 2019

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