Laser Ablation Molecular Isotopic Spectrometry: Parameter influence on boron isotope measurements

Mao, Xianglei; Bol’shakov, Alexander A.; Perry, Dale L.; Sorkhabi, Osman; Russo, Richard E.

doi:10.1016/j.sab.2011.06.007

Cited by 84 publications

(72 citation statements)

References 36 publications

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“…Multivariate regression is still preferable because unresolved or partially-resolved data can be utilized in addition to the resolved features (as confirmed for boron isotopes [32]). Such supplemental information can be contained in unresolved and overlapping R-branches of the CN bands seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Laser ablation molecular isotopic spectrometry of carbon isotopes

Bol’shakov

Mao

Jain

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

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Quantitative determination of carbon isotopes using Laser Ablation Molecular Isotopic Spectrometry (LAMIS) is described. Optical emission of diatomic molecules CN and C 2 is used in these measurements. Two quantification approaches are presented: empirical calibration of spectra using a set of reference standards and numerical fitting of a simulated spectrum to the experimental one. Formation mechanisms of C 2 and CN in laser ablation plasma are briefly reviewed to provide insights for implementation of LAMIS measurements. A simulated spectrum of the 12 C 2 Swan system was synthesized using four constituents within 473.5-476.5 nm.Simulation included three branches of 12 C 2 (1-0), branches R(0-0) and R(1-1), and branch P(9-8) of 12 C 2 . Spectral positions of the tail lines in R(0-0) and R(1-1) were experimentally measured, since they were not accurately known before. The Swan band (1-0) of the isotopologue 13 C 12 C was also simulated. Fitting to the experimental spectrum yielded the ratio 13 C/ 12 C = 1.08% in a © 2015. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ good agreement with measurements by isotope ratio mass spectrometry. LAMIS promises to be useful in coal, oil and shale exploration, carbon sequestration monitoring, and agronomy studies.

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Section: Resultsmentioning

confidence: 99%

Laser ablation molecular isotopic spectrometry of carbon isotopes

Bol’shakov

Mao

Jain

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…For the present measurements, the delay time was 5 s after the laser pulse and the densities of electrons and ions are expected to be low. Hence, the plasma continuum due to ionelectron recombination should be significantly decayed [2,37]. For example, using a similar setup with an uraninite ore sample but at other wavelengths, we previously reported that the intense plasma continuum emission undergoes rapid decay at 1 s delay [23].…”

Section: Determination Of Lamis-libs Base Spectra For 235 U and 238 Umentioning

confidence: 97%

“…In contrast, because the vibrational and rotational motions of a molecule heavily depend on its reduced mass, the additional vibrational and rotational energy levels in a molecule greatly amplify the isotopic effects on optical spectra. Consequently, isotopic shifts exhibited in molecular spectra may exceed those in atomic spectra by two to three orders of magnitude [1][2][3], and become readily measurable in an atmosphericpressure plasma. Isotopic LAMIS signatures from a number of elements, including H, B, C, N, O, Sr and Zr [1][2][3][4][5][6], have already been reported.…”

Section: Introductionmentioning

confidence: 99%

Combination of atomic lines and molecular bands for uranium optical isotopic analysis in laser induced plasma spectrometry

Mao

Chan

Choi

et al. 2017

J Radioanal Nucl Chem

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“…In this respect, recent research on formation dynamics of C 2 and CN molecules has benefited from selective isotopic labeling with 13 C atoms. 26 Concerning dicarbon radicals, measurements of 12 C 13 C, when the 12 C− 13 C bonding is not native in a solid mixture of benzoic acid (C 7 O 2 H 6 )-12 C and amorphous carbon-13 C, have demonstrated that recombination is a plausible route to produce C 2 species. 26 Concerning dicarbon radicals, measurements of 12 C 13 C, when the 12 C− 13 C bonding is not native in a solid mixture of benzoic acid (C 7 O 2 H 6 )-12 C and amorphous carbon-13 C, have demonstrated that recombination is a plausible route to produce C 2 species.…”

Section: ■ Introductionmentioning

confidence: 99%

Exploring the formation routes of diatomic hydrogenated radicals using femtosecond laser-induced breakdown spectroscopy of deuterated molecular solids

Serrano

Moros

Laserna

2015

J. Anal. At. Spectrom.

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In recent years, laser-induced breakdown spectroscopy (LIBS) has expanded beyond the multielemental analysis capability by exploring molecular solids and the optical emissions from diatomic radicals. Despite the many efforts to this end, the greatest emphasis has been placed on the study of the dynamics and the optical and temporal behavior of CN and C 2 emissions in order to elucidate the main chemical reactions occurring in the plasma. Other diatomic species, whose emission bands also appear in the visible and nearultraviolet regions of the LIBS spectrum, remain virtually unexplored. This research focuses, for the first time, on elucidating the formation pathways of CH, NH, and OH radicals in femtosecond laser-produced plasmas of molecular solids. As the origin of diatomic species is not easily traceable to a single formation route due to the occurrence of primary and secondary processes within the plasma plume, isotopic labeling of some molecules has been used as a diagnostics tool. Deuterated isotopologues of urea, terephthalic acid and anthracene have been evaluated. The dominant routes have been identified through a comparison of the observed isotopic patterns. Findings reveal the direct release of native molecular bonds as a significant source that populates femtosecond laser-produced plasmas with NH radicals. Additional reactions of native hydrogen from molecules and atmospheric nitrogen also contribute to form such species. Oxygen from the atmosphere competes with nitrogen in these reactions to populate plasmas with OH radicals. Alternatively, the direct connection between C 2 and CH emissions verify that this radical derives from diatomic carbon fragments as precursors. These new findings entail a further step towards the use of molecular emissions as diagnostics tools in the analytical applications of laser-induced plasmas of organic compounds.

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Laser Ablation Molecular Isotopic Spectrometry: Parameter influence on boron isotope measurements

Cited by 84 publications

References 36 publications

Laser ablation molecular isotopic spectrometry of carbon isotopes

Laser ablation molecular isotopic spectrometry of carbon isotopes

Combination of atomic lines and molecular bands for uranium optical isotopic analysis in laser induced plasma spectrometry

Exploring the formation routes of diatomic hydrogenated radicals using femtosecond laser-induced breakdown spectroscopy of deuterated molecular solids

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