Date: 16:00-18:00, Friday, January 18, 2019
Place: 1F, Lecture room 101, Faculty of Science Building 1
Contributor: Takafumi Hirata
日 時：2019年1月18日（金）16:00～18:00
場 所：理学部1号館 1階 101教室
講演者：平田岳史
Title: New Directions in non-traditional geochemistry
Abstract:
The mass spectrometer utilising an
atmospheric pressure plasma as an ion source (ICP-MS) is
likely to become a significant and cost-effective tool for many isotopic
measurements (Galler et al., 2007). Twenty-one years have passed since the first
landmark publication in laser ablation ICP-MS by Alan Gray in 1985, and the
recent progress in analytical capability achieved by the LA-ICPMS technique has
shown that the technique is coming of age.
It is also much more versatile, permitting
isotopic analysis for the elements which have been thought intractable, and
allowing the in-situ isotopic analysis on small areas from sample materials. Recent progress in the ICP-MS
technique is dramatic improvements in precision and accuracy of the isotopic
ratio measurements. Moreover, laser
ablation sampling technique combined with the ICP-MS technique (LA-ICPMS) is
now widely accepted as one of the most sensitive and rapid analytical tools for
elemental and isotopic analysis of solid materials. The continuous development of LA-ICPMS
techniques has provided more precise elemental and isotopic data. With a better understanding of the mechanism
of the laser ablation process, and with a higher elemental sensitivity of the
LA-ICPMS technique, the precision of the isotopic ratio measurement has
successively improved. However, we
should not be too hasty to open the champagne, as there remain many problems to
be solved in order to make it a truly routine and mature analytical tool, and
experimentation still remains crucial. Faced
with this, we are still struggling to achieve better analytical results or
capability of the technique. One of the major
development in the laser technology to come to light in these ten years was the
recent application of a femtosecond (fs) lasers for solving various microanalytical
problems, and several groups have been independently employing this
technology. Here several scientific
achievements, such as setting up the new laser or development of
non-traditional stable isotope geochemistry using heavy elements, achieved by
the research group at the Geochemical Research Center, will be highlighted in
this talk. Quench your thirst for
knowledge.