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Journal Articles

The 5$$nu$$$$_{rm NH}$$ and 5$$nu$$$$_{rm ND}$$ vibrational bands of partially deuterated ammonia species

Akagi, Hiroshi; Yokoyama, Keiichi; Yokoyama, Atsushi; Wada, Akira

Journal of Molecular Spectroscopy, 231(1), p.37 - 49, 2005/05

 Times Cited Count:2 Percentile:12.11(Physics, Atomic, Molecular & Chemical)

Absorption spectra of gaseous samples containing NH$$_{2}$$D and NHD$$_{2}$$ have been measured in 11580-11880 and 15280-15610 cm$$^{-1}$$ regions, corresponding to the 5$$nu$$$$_{rm ND}$$ and 5$$nu$$$$_{rm NH}$$ vibrational bands, respectively. Photoacoustic spectroscopy has been utilized for the measurement. The molecular constants of NH$$_{2}$$D in the 5$$nu$$$$_{rm ND}$$ state and NHD$$_{2}$$ in the 5$$nu$$$$_{rm NH}$$ state have been determined by the analysis of the obtained absorption spectrum. Comparing the constants with those of the vibrational ground states, structural changes caused by the stretching excitations have been elucidated. The HND bond angles are decreased by these excitations. The dependence of the molecular constants on the stretching quantum number has been also derived by simple Birge-Sponer and Dunham analyses.

Journal Articles

Damage diagnostic of localized impact erosion by measuring acoustic vibration

Futakawa, Masatoshi; Naoe, Takashi*; Kogawa, Hiroyuki; Ikeda, Yujiro

Journal of Nuclear Science and Technology, 41(11), p.1059 - 1064, 2004/11

 Times Cited Count:12 Percentile:63.39(Nuclear Science & Technology)

High power spallation targets for neutron sources are developing in the world. Mercury target will be installed at the material and life science facility in J-PARC, which will promote innovative science. The mercury target is subject to the pressure wave caused by the proton bombarding mercury. The pressure wave propagation induces the cavitation in mercury that imposes localized impact damage on the target vessel. The impact erosion is a critical issue to decide the lifetime of the target. The electric Magnetic Impact Testing Machine, MIMTM, was developed to produce the localized impact erosion damage and evaluate the damage formation. Acoustic vibration measurement was carried out to investigate the correlation between damage and acoustic vibration. It was confirmed that the acoustic vibration is useful to predict the damage due to the localized impact erosion and to diagnose the structural integrity.

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