title: Study of hydrogen and deuterium emission characteristics in laser-induced low-pressure helium plasma for the suppression of surface water contamination.
abstract: An experimental study was conducted in search of the experimental condition required for the much needed suppression of spectral interference caused by surface water in hydrogen analysis using laser-induced low-pressure helium plasma spectroscopy. The problem arising from the difficulty in distinguishing hydrogen emission from hydrogen impurity inside the sample and that coming from the water molecules was overcome by taking advantage of similar emission characteristics shared by hydrogen and deuterium demonstrated in this experiment by the distinct time-dependent and pressure-dependent variations of the D and H emission intensities from the D-doped zircaloy-4 samples. This similarity allows the study of H impurity emission in terms of D emission from the D-doped samples and thereby separating it from the H emission originating from the water molecules. Employing this strategy has allowed us to achieve the large suppression of water induced spectral interference from the previous minimum of 400 microg/g to the current value of 30 microg/g when a laser beam of 34 mJ under tight focusing condition was employed. Along with this favorable result, this experimental condition has also provided a much better (about 6-fold higher) spatial resolution, although these results were achieved at the expense of reducing the linear calibration range from the previous 4 300 microg/g to the present 200 microg/g.
authors.affiliation: Department of Mechanical Engineering, Faculty of Engineering, Diponegoro University, Tembalang Campus, Semarang 50275, Indonesia.
authors.lastname: Munadi
authors.forename: Marincan
authors.initials: M
authors.lastname: Pardede
authors.forename: Rinda
authors.initials: R
authors.lastname: Hedwig
authors.forename: Maria Margaretha
authors.initials: MM
authors.lastname: Suliyanti
authors.forename: Tjung Jie
authors.initials: TJ
authors.lastname: Lie
authors.forename: Zener Sukra
authors.initials: ZS
authors.lastname: Lie
authors.forename: Koo Hendrik
authors.initials: KH
authors.lastname: Kurniawan
authors.forename: Kiichiro
authors.initials: K
authors.lastname: Kagawa
authors.forename: Muliadi
authors.initials: M
authors.lastname: Ramli
authors.forename: Kenichi
authors.initials: K
authors.lastname: Fukumoto
authors.forename: Tadashi
authors.initials: T
authors.lastname: Maruyama
authors.forename: May On
authors.initials: MO
authors.lastname: Tjia