@article{
 title = {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},
 type = {article},
 year = {2015},
 identifiers = {[object Object]},
 keywords = {ambient helium,configuration,deuterium,double pulse,gas plasma,he gas plasma,he metastable excited state,hydrogen analysis,laser-induced breakdown spectroscopy,libs,low-pressure,picosecond laser,quantitative-analysis,samples,single,spark},
 pages = {115-123},
 volume = {69},
 id = {9f95041a-34dc-3ecf-9d50-1c572b572f0f},
 created = {2018-11-01T17:24:49.851Z},
 file_attached = {false},
 profile_id = {6c08603e-f5fc-34c8-a4d1-319cca2e54f4},
 group_id = {18670495-6d76-3294-a982-97e5d10d5ff5},
 last_modified = {2018-11-01T17:24:49.851Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 citation_key = {Jobiliong2015},
 private_publication = {false},
 abstract = {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 (1s(1) 3d(1)). 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 N-2 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.},
 bibtype = {article},
 author = {Jobiliong, E and Suyanto, H and Marpaung, A M and Abdulmadjid, S N and Idris, N and Hedwig, R and Ramli, M and Pardede, M and Suliyanti, M M and Kagawa, K and Fukumoto, K I and Tjia, M O and Lie, T J and Lie, Z S and Kurniawan, K H},
 journal = {Applied Spectroscopy},
 number = {1}
}

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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 (1s(1) 3d(1)). 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 N-2 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.","bibtype":"article","author":"Jobiliong, E and Suyanto, H and Marpaung, A M and Abdulmadjid, S N and Idris, N and Hedwig, R and Ramli, M and Pardede, M and Suliyanti, M M and Kagawa, K and Fukumoto, K I and Tjia, M O and Lie, T J and Lie, Z S and Kurniawan, K H","journal":"Applied Spectroscopy","number":"1","bibtex":"@article{\n title = {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},\n type = {article},\n year = {2015},\n identifiers = {[object Object]},\n keywords = {ambient helium,configuration,deuterium,double pulse,gas plasma,he gas plasma,he metastable excited state,hydrogen analysis,laser-induced breakdown spectroscopy,libs,low-pressure,picosecond laser,quantitative-analysis,samples,single,spark},\n pages = {115-123},\n volume = {69},\n id = {9f95041a-34dc-3ecf-9d50-1c572b572f0f},\n created = {2018-11-01T17:24:49.851Z},\n file_attached = {false},\n profile_id = {6c08603e-f5fc-34c8-a4d1-319cca2e54f4},\n group_id = {18670495-6d76-3294-a982-97e5d10d5ff5},\n last_modified = {2018-11-01T17:24:49.851Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Jobiliong2015},\n private_publication = {false},\n abstract = {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. 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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. 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