2023.11.02

The Plasma Quantum Processes Unit holds monthly seminars to disseminate the research activities of the Unit. This time, Dr. Yuri Ralchenko from National Institute of Standards and Technology (NIST), USA (https://www.nist.gov/people/yuri-ralchenko ), will give a lecture titled “The Scales of Atomic Spectroscopy: from Nuclear Radii to Kilonovas”.
We hope many of you will join us.

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【Date】　November 9 (Thu.) 2023, 13:30-14:45

【Format】　Hybrid

【Place】　Seminar room 501, 5th floor Research Building, NIFS

【Zoom Conference room】　Pre-registration is required at here

【Speaker】Yuri Ralchenko (NIST, USA)

【Title】The Scales of Atomic Spectroscopy: from Nuclear Radii to Kilonovas

【Abstract】

　Atomic spectra, produced by both neutral atoms and charged ions, can supply a vast amount of detailed information on physical events happening on scales differing by many orders of magnitude. In this talk, we will present an overview of the recent activities at the NIST Atomic Spectroscopy Group on measurement, interpretation, analysis, and dissemination of spectroscopic data of very diverse nature. In particular, precise determination of both relative and absolute nuclear charge radii changes in highly-charged high-Z elements that involves accurate EUV measurements and highly-advanced atomic structure calculations will be discussed in detail. Then, a state-of-the-art transition-edge-sensor microcalorimeter was used to perform precise x-ray measurements of forbidden transitions in F-like heavy ions for tests of modern QED theories. Finally, the status of the NIST atomic databases including the recent database of lanthanide/actinide opacities for kilonova modeling and the recent developments will be presented.

【Contact】　I. Murakami