Dr. Dayong Tan [Institute of Advanced Science Facilities]

Title: X-ray Raman spectroscopy to probe the light elements at extreme conditions

Language: English

Time: 14:00-15:00, November 11, 2024, Monday

Place: Onsite：Conference room 410, HPSTAR (SH)

          Online: https://meeting.tencent.com/dm/gLvK9YWEqS23  Meeting ID: 594-531-445

Host: Dr. Wenge Yang

Abstract:

High-pressure synchrotron radiation X-ray Raman spectroscopy is a powerful tool for investigating the electronic states and local atomic structures of light elements (Z<10, such as carbon, nitrogen, and oxygen) under extreme temperature and pressure conditions. However, practical challenges, including prolonged collection times (days) and high energy resolution (approaching 1 eV), hinder widespread use among researchers. Several techniques such as capillary collimators, vacuum transmission, arrays of crystal analyzers, and coherent light will be introduced to develop the X-ray Raman spectrometer. As a unique technology, X-ray Raman is utilized to explore the electronic states and local atomic structures of oxygen in amorphous silicates derived from impact glasses and melts produced in a laser-heated diamond anvil cell. The destructive and reconstructive shock metamorphic effects are anticipated to be analyzed through various structures and their corresponding changes in temperature, pressure, and time. Additionally, this report will also present some techniques and their associated achievements related to dynamic and static high pressure.

Biography:

Dr. Dayong TAN obtained his PhD in "Mineralogy, Petrology and Mineral Deposit Geology" from the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, in 2009. Following his graduation, he served as an engineer and later as a senior engineer at the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS). From 2013 to 2016, he worked as a lab manager at the Center for High Pressure Science & Technology Advanced Research (HPSTAR). Since 2021, he has been employed as a beamline scientist at the Institute of Advanced Science Facilities, Shenzhen (IASF). In March 2017, he was awarded the 1st prize for science and technology by Guangdong province, and in January 2022, he received support from the Shenzhen Pengcheng Peacock Plan (Class-C). His research interests include high-pressure probing technologies (laser Raman, X-ray diffraction, and X-ray spectroscopy) and high-pressure mineralogy, specifically the dynamic and static compression effects on minerals.