Nd:YAG-CO_2 double-pulse laser induced breakdown spectroscopy of organic films

Weidman, Matthew; Baudelet, Matthieu; Palanco, S.; Sigman, Michael E.; Dagdigian, Paul J.; Richardson, Martin

doi:10.1364/oe.18.000259

Cited by 45 publications

(26 citation statements)

References 37 publications

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“…This can be enhanced for both nanosecond and femtosecond ablation events through a variety of means including plasma plume excitation using a second laser pulse [14]. Enhanced emission from molecular species in dual-pulse experiments has also been reported for nanosecond ablation events and has been used for identification of molecular overlayers [28]. In this section, we will highlight differences between single pulse nanosecond and femtosecond laser-induced breakdown spectroscopy of relatively thin, organic molecular overlayers residing on surfaces for the purpose of sensing of these molecular layers [29,30].…”

Section: Laser-induced Breakdown Spectroscopymentioning

confidence: 99%

Ultrafast Laser-Based Spectroscopy and Sensing: Applications in LIBS, CARS, and THz Spectroscopy

Leahy-Hoppa

Miragliotta

Osiander

et al. 2010

Sensors

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Ultrafast pulsed lasers find application in a range of spectroscopy and sensing techniques including laser induced breakdown spectroscopy (LIBS), coherent Raman spectroscopy, and terahertz (THz) spectroscopy. Whether based on absorption or emission processes, the characteristics of these techniques are heavily influenced by the use of ultrafast pulses in the signal generation process. Depending on the energy of the pulses used, the essential laser interaction process can primarily involve lattice vibrations, molecular rotations, or a combination of excited states produced by laser heating. While some of these techniques are currently confined to sensing at close ranges, others can be implemented for remote spectroscopic sensing owing principally to the laser pulse duration. We present a review of ultrafast laser-based spectroscopy techniques and discuss the use of these techniques to current and potential chemical and environmental sensing applications.

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Section: Laser-induced Breakdown Spectroscopymentioning

confidence: 99%

Ultrafast Laser-Based Spectroscopy and Sensing: Applications in LIBS, CARS, and THz Spectroscopy

Leahy-Hoppa

Miragliotta

Osiander

et al. 2010

Sensors

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“…intensity of the specific spectral features) is proportional to concentration(s) of the analyte(s) contributing to it. In some cases molecular emissions are also be observed [4–5]. The standard atomic and ionic emission wavelengths are tabulated in NIST database [6].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced breakdown spectroscopy-based investigation and classification of pharmaceutical tablets using multivariate chemometric analysis

Myakalwar

Sreedhar

Barman

et al. 2011

Talanta

116

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We report the effectiveness of laser-induced breakdown spectroscopy (LIBS) in probing the content of pharmaceutical tablets and also investigate its feasibility for routine classification. This method is particularly beneficial in applications where its exquisite chemical specificity and suitability for remote and on site characterization significantly improves the speed and accuracy of quality control and assurance process. Our experiments reveal that in addition to the presence of carbon, hydrogen, nitrogen and oxygen, which can be primarily attributed to the active pharmaceutical ingredients, specific inorganic atoms were also present in all the tablets. Initial attempts at classification by a ratiometric approach using oxygen to nitrogen compositional values yielded an optimal value (at 746.83 nm) with the least relative standard deviation but nevertheless failed to provide an acceptable classification. To overcome this bottleneck in the detection process, two chemometric algorithms, i.e. principal component analysis (PCA) and soft independent modeling of class analogy (SIMCA), were implemented to exploit the multivariate nature of the LIBS data demonstrating that LIBS has the potential to differentiate and discriminate among pharmaceutical tablets. We report excellent prospective classification accuracy using supervised classification via the SIMCA algorithm, demonstrating its potential for future applications in process analytical technology, especially for fast on-line process control monitoring applications in the pharmaceutical industry.

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“…It should be noted that TEPS likely does not rely on the electron scattering of the Townsend effect, as suggested by the acronym; however, the exact nature of the reheating process is not clear though it has been studied in the past [32,38]. Regardless, the long interaction time of the TEA laser that is associated with TEPS (commonly, 50% energy in a 100 to 200 ns peak with another 50% in a 1 to 10 μs tail), as well as the sustainment of the plasma for a longer period than for DP-LIBS with only near-IR wavelengths makes TEPS an alternative and potentially superior technique for creating ionic, atomic, and molecular species from a starting LIBS plasma [34,39]. Consequently, TEPS could provide even greater sensitivity over other DP-LIBS methods, making it useful for understanding its application to LAMIS.…”

Section: Introductionmentioning

confidence: 99%

Mid-IR enhanced laser ablation molecular isotopic spectrometry

Brown

Ford

Akpovo

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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A double-pulsed laser-induced breakdown spectroscopy (DP-LIBS) technique utilizing wavelengths in the mid-infrared (MIR) for the second pulse, referred to as double-pulse LAMIS (DP-LAMIS), was examined for its effect on detection limits compared to single-pulse laser ablation molecular isotopic spectrometry (LAMIS). A MIR carbon dioxide (CO2) laser pulse at 10.6 μm was employed to enhance spectral emissions from nanosecond-laser-induced plasma via mid-IR reheating and in turn, improve the determination of the relative abundance of isotopes in a sample. This technique was demonstrated on a collection of 10 BO and 11 BO molecular spectra created from enriched boric acid (H3BO3) isotopologues in varying concentrations. Effects on the overall ability of both LAMIS and DP-LAMIS to detect the relative abundance of boron isotopes in a starting sample were considered. Least-squares fitting to theoretical models was used to deduce plasma parameters and understand reproducibility of results. Furthermore, some optimization for conditions of the enhanced emission was achieved, along with a comparison of the overall emission intensity, plasma density, and plasma temperature generated by the two techniques.

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Nd:YAG-CO_2 double-pulse laser induced breakdown spectroscopy of organic films

Cited by 45 publications

References 37 publications

Ultrafast Laser-Based Spectroscopy and Sensing: Applications in LIBS, CARS, and THz Spectroscopy

Ultrafast Laser-Based Spectroscopy and Sensing: Applications in LIBS, CARS, and THz Spectroscopy

Laser-induced breakdown spectroscopy-based investigation and classification of pharmaceutical tablets using multivariate chemometric analysis

Mid-IR enhanced laser ablation molecular isotopic spectrometry

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