Measurement Technique of Boron Isotopic Ratio by Laser-induced Breakdown Spectroscopy

Niki, Hideaki; Yasuda, Takashi; Kitazima, Iwao

doi:10.1080/18811248.1998.9733817

Cited by 34 publications

(17 citation statements)

References 8 publications

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“…In the recently developed technique of Laser Ablation Molecular Isotopic Spectrometry (LAMIS)212223, radiative molecular transitions from diatomic molecules are used to extract the isotopic composition of a sample under ambient atmospheric conditions. A similar method has been demonstrated in earlier work by Niki et al 24,. where rarefied atmospheric conditions were used.…”

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confidence: 54%

Standoff Detection of Uranium and its Isotopes by Femtosecond Filament Laser Ablation Molecular Isotopic Spectrometry

Hartig

Ghebregziabher

Jovanovic

2017

Sci Rep

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The ability to perform not only elementally but also isotopically sensitive detection and analysis at standoff distances is impor-tant for remote sensing applications in diverse ares, such as nuclear nonproliferation, environmental monitoring, geophysics, and planetary science. We demonstrate isotopically sensitive real-time standoff detection of uranium by the use of femtosecond filament-induced laser ablation molecular isotopic spectrometry. A uranium oxide molecular emission isotope shift of 0.05 ± 0.007 nm is reported at 593.6 nm. We implement both spectroscopic and acoustic diagnostics to characterize the properties of uranium plasma generated at different filament-uranium interaction points. The resulting uranium oxide emis-sion exhibits a nearly constant signal-to-background ratio over the length of the filament, unlike the uranium atomic and ionic emission, for which the signal-to-background ratio varies significantly along the filament propagation. This is explained by the different rates of increase of plasma density and uranium oxide density along the filament length resulting from spectral and temporal evolution of the filament along its propagation. The results provide a basis for the optimal use of filaments for standoff detection and analysis of uranium isotopes and indicate the potential of the technique for a wider range of remote sensing applications that require isotopic sensitivity.

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mentioning

confidence: 54%

Standoff Detection of Uranium and its Isotopes by Femtosecond Filament Laser Ablation Molecular Isotopic Spectrometry

Hartig

Ghebregziabher

Jovanovic

2017

Sci Rep

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“…Despite the fact that utilizing molecular emission for the determination of isotopic abundance ratio in a sample is a concept with a long history [5,6], it has been relatively recently that isotope ratios were measured through molecular spectra with laser as the excitation source. The first study utilizing the laser induced plasma for isotopic analysis based on molecular spectra was reported by Niki et al [7] in 1998. Under operation at a reduced pressure of 4 hPa, they demonstrated the marked differences in the BO A 2  -X 2  (0, 2) molecular bands emitted from the two isotopologues, 10 BO and 11 BO, and reported that the isotopic compositions of the two isotopologues could be measured from their relative peak heights [7].…”

Section: Introductionmentioning

confidence: 99%

“…The first study utilizing the laser induced plasma for isotopic analysis based on molecular spectra was reported by Niki et al [7] in 1998. Under operation at a reduced pressure of 4 hPa, they demonstrated the marked differences in the BO A 2  -X 2  (0, 2) molecular bands emitted from the two isotopologues, 10 BO and 11 BO, and reported that the isotopic compositions of the two isotopologues could be measured from their relative peak heights [7]. The claimed detectability was only 5% (i.e., able to detect > 5% difference in isotopic abundance) from the natural abundance of boron [7].…”

Section: Introductionmentioning

confidence: 99%

“…Under operation at a reduced pressure of 4 hPa, they demonstrated the marked differences in the BO A 2  -X 2  (0, 2) molecular bands emitted from the two isotopologues, 10 BO and 11 BO, and reported that the isotopic compositions of the two isotopologues could be measured from their relative peak heights [7]. The claimed detectability was only 5% (i.e., able to detect > 5% difference in isotopic abundance) from the natural abundance of boron [7]. In our first demonstration studies of LAMIS under atmospheric pressure, we used a nanosecond-pulsed laser for isotopic analysis of boron [2,3], also utilizing the BO A 2  -X 2  + band.…”

Section: Introductionmentioning

confidence: 99%

“…In all the above examples, the minor isotopes were present at relatively high abundances. The boron figures quoted above were all from boron samples with natural isotopic 5 abundance [2,3,[7][8][9][10] (the minor isotope, 10 B is ~ 19.9% [12]) whereas the atom percentages of 2 H in the OH/OD LAMIS study [11] ranged from 6% to 97%. There are many isotopes with natural abundances around or less than 1% (e.g., 13 C ~1.1%, 15 N ~0.4%, 18 O ~0.2%, 235 U ~0.7% [12]).…”

Section: Introductionmentioning

confidence: 99%

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Reduction of spectral interferences and noise effects in laser ablation molecular isotopic spectrometry with partial least square regression – a computer simulation study

Mao

Chan

Zorba

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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The fundamental analytical accuracies and precisions attainable by laser ablation molecular isotopic spectrometry (LAMIS), with emphasis on the impacts from spectral interferences and measurement noise, were investigated by means of computer simulation. The study focused on the analysis of a minor isotope at sub-to single-percentage abundance level. With a natural abundance about 1.1% for 13 C, the C 2 Swan band (d 3 Π ga 3 Π u) with  = +1 was selected as a representative system. The characteristics (e.g., noise amplitude and distribution, signal strength, and signal-to-background ratio) of the simulated spectra were experimentally characterized. Partial least square (PLS) regression was used to extract isotopic information from the simulated molecular spectra. In the absence of any spectral interference and with the use of a calibration set consisting of eleven isotopic standards, the theoretical accuracies and precisions with signal accumulation from 100 laser shots are about 0.002% and 0.001%, respectively, in absolute percentage abundance of 13 C. The theoretical analytical accuracies slightly degrade, but are adequate for many applications, to 0.004% and 0.008% respectively, for calibrations involving only three and two isotopic standards. It was found that PLS regression is not only immune to both source-flicker and photon-shot noise, but is also effective in differentiating the spectral patterns from the analyte against those from spectral interferences. The influences of spectral interference from single or multiple atomic emission lines were simulated, and new ways to minimize their impacts were formulated and demonstrated. It was found that the wavelength range selected for the computation of the normalization factor should not contain any spectralinterfering peak, and a properly chosen wavelength range increases the tolerance of spectral interference by at least one order of magnitude. With matrix-matched calibration standards, the precisions (expressed as RSDs of the determined 13 C isotopic abundances) degrade from ~1‰ in 2 the absence of spectral interference, to ~3‰, 10‰ and 20‰ with spectral-interfering peaks that are 10, 100 and 1000, respectively, stronger than the molecular bandhead of the analyte. The study concluded that PLS regression is a powerful and indispensable tool for extraction of isotopic information from LAMIS spectra.

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Determination of the isotopic composition of enriched materials using laser ablation molecular isotopic spectrometry: partial least squares and multivariate curve resolution for the determination of 15N content in enriched urea

Santos

Pasquini

2020

Anal Bioanal Chem

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Measurement Technique of Boron Isotopic Ratio by Laser-induced Breakdown Spectroscopy

Cited by 34 publications

References 8 publications

Standoff Detection of Uranium and its Isotopes by Femtosecond Filament Laser Ablation Molecular Isotopic Spectrometry

Standoff Detection of Uranium and its Isotopes by Femtosecond Filament Laser Ablation Molecular Isotopic Spectrometry

Reduction of spectral interferences and noise effects in laser ablation molecular isotopic spectrometry with partial least square regression – a computer simulation study

Determination of the isotopic composition of enriched materials using laser ablation molecular isotopic spectrometry: partial least squares and multivariate curve resolution for the determination of 15N content in enriched urea

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