Hydrogen analysis in solid samples by utilizing He metastable atoms induced by TEA CO2 laser plasma in He gas at 1 atm

Ramli, Muliadi; Idris, Nasrullah; Fukumoto, Ken-ichi; Niki, Hideaki; Sakan, Fujio; Maruyama, Tadashi; Kurniawan, Koo Hendrik; Lie, Tjung Jie; Kagawa, Keiichiro

doi:10.1016/j.sab.2007.10.007

Cited by 33 publications

(20 citation statements)

References 30 publications

(36 reference statements)

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“…The experimental setup employed in this work is basically similar to those used in our previous works, [21][22] which is schematically presented in Fig. 1 for easy reference.…”

Section: Methodsmentioning

confidence: 99%

“…These excited He atoms were shown to provide the He assisted excitation (HAE) mechanism for the delayed excitation and emission of the ablated analyte atoms when the plasma becomes relatively cooled and free from the charged particles [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. The benefits of using ambient He gas in LIBS applications have been amply demonstrated in a number of cases according to our previous works, [15][16][17][18][19][20][21][22][23][24][25][26][27][28] including C analysis of steel products [29][30]. Nevertheless its application to C analysis of stones has yet to appear in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of carbon detection sensitivity in laser induced breakdown spectroscopy with low pressure ambient helium gas

Idris

Pardede

Jobiliong

et al. 2019

Spectrochimica Acta Part B: Atomic Spectroscopy

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Carbon detection is usually difficult to carry out with high sensitivity and minimally destructive effect. While the conventional laser induced breakdown spectroscopy (LIBS) method operated with atmospheric ambient air is well known as a powerful and versatile analytical tool, it suffers nevertheless from the low sensitivity of C detection when measured in both atmospheric and low pressure ambient air with the more adverse effect found in the former case. This was shown to have its origin in the serious time mismatching effect between the formation of the shock wave plasma by the ablated major host elements and the premature fast passage of the much lighter ablated C atom. However, this study shows the result of high sensitivity C analysis of stone samples using LIBS technique with relatively low laser pulse energy of 60 mJ and low pressure He ambient gas without showing visible surface damage. The helium gas provides the additional delayed excitation by the He metastable excited states through the Penning-like ionization process. The C emission intensities measured from the jasper and black stone in 2.6 kPa He ambient gas are in general significantly higher than those measured in 0.5 kPa ambient air. The enhancement is shown to increase reaching an 8 fold enhancement with increased laser energy up to 60 mJ before undesirable surface damage is created. A further measurement of C emission using pelletized KBr mixtures with various CaCO 3 concentrations reveals a straight calibration line of rather large slope with extrapolated zero intercept and estimated detection limit of around 0.6 ppm, demonstrating its potential application for highly sensitive quantitative analysis of C with minimal destructive effect.

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“…The experimental setup employed in this work is basically similar to those used in our previous works, [21][22] which is schematically presented in Fig. 1 for easy reference.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of carbon detection sensitivity in laser induced breakdown spectroscopy with low pressure ambient helium gas

Idris

Pardede

Jobiliong

et al. 2019

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…The early recognition of the favorable intensity enhancement effect of He ambient gas 1–4 in laser-induced breakdown spectroscopy (LIBS) 5–12 has since stimulated a long series of investigative and corroborative experiments using either single-pulse 7 or double-pulse 13–23 laser setups, supporting and clarifying the much desired effect. Its benefits have been further demonstrated for high-sensitivity and high-resolution spectrochemical analysis, especially for light elements such as H and D. 24–36 The important advantages of the He ambient gas have been often suggested to have their origin in the role of He metastable excited states for the delayed excitation of the ablated elements in the He gas plasma. Despite a variety of circumstantial evidence from experimental results reported in the literature, 29–32 additional concrete experimental data are still needed for the establishment of the suggested role of the He metastable excited states.…”

Section: Introductionmentioning

confidence: 99%

Spectral and Dynamic Characteristics of Helium Plasma Emission and its Effect on a Laser-Ablated Target Emission in a Double-Pulse Laser-Induced Breakdown Spectroscopy (LIBS) Experiment

et al. 2015

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A systematic study has been performed on the spectral characteristics of the full spectrum of He emission lines and their time-dependent behaviors measured from the He gas plasmas generated by a nanosecond neodymium-doped yttrium aluminum garnet laser. It is shown that among the major emission lines observed, the triplet He(I) 587.6 nm emission line stands out as the most prominent and long-lasting line, associated with de-excitation of the metastable triplet (S = 1) excited state (1s1 3d1). The role of this metastable excited state is manifested in the intensity enhancement and prolonged life time of the Cu emission with narrow full width half-maximum, as demonstrated in an orthogonal double-pulse experiment using a picosecond laser for the target ablation and a nanosecond laser for the prior generation of the ambient He gas plasma. These desirable emission features are in dire contrast to the characteristics of emission spectra observed with N2 ambient gas having no metastable excited state, which exhibit an initial Stark broadening effect and rapid intensity diminution typical to thermal shock wave-induced emission. The aforementioned He metastable excited state is therefore responsible for the demonstrated favorable features. The advantage of using He ambient gas in the double-pulse setup is further confirmed by the emission spectra measured from a variety of samples. The results of this study have thus shown the potential of extending the existing laser-induced breakdown spectroscopy application to high-sensitivity and high-resolution spectrochemical analysis of wide-ranging samples with minimal destructive effect on the sample surface.

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“…The emission spectra of LIB plasma produced by a CO 2 laser in different gases have been reported recently by us [14][15][16]. For He, it has been demonstrated by time-integrated and time-resolved OES [17] that a TEA-CO 2 laser with the help of a metal sub-target generates helium breakdown plasma in which the helium meta-stable excited state is produced.…”

Section: Introductionmentioning

confidence: 92%

Time-resolved optical emission spectroscopic measurements of He plasma induced by a high-power CO2 pulsed laser

Camacho

Díaz

Santos

et al. 2011

Spectrochimica Acta Part B: Atomic Spectroscopy

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Hydrogen analysis in solid samples by utilizing He metastable atoms induced by TEA CO2 laser plasma in He gas at 1 atm

Cited by 33 publications

References 30 publications

Enhancement of carbon detection sensitivity in laser induced breakdown spectroscopy with low pressure ambient helium gas

Enhancement of carbon detection sensitivity in laser induced breakdown spectroscopy with low pressure ambient helium gas

Spectral and Dynamic Characteristics of Helium Plasma Emission and its Effect on a Laser-Ablated Target Emission in a Double-Pulse Laser-Induced Breakdown Spectroscopy (LIBS) Experiment

Time-resolved optical emission spectroscopic measurements of He plasma induced by a high-power CO2 pulsed laser

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