Seminar- “Dark Solar Wind” with Dr. Jae Hyeok Chang
Physics Seminar
September 27, 2023
11:00 AM - 12:00 PM
Location
SES 2214
Calendar
Download iCal FileAbstract: The study of the effects of pressure on materials is fundamental to understanding a broad range of problems in chemistry, Earth and planetary sciences, physics, materials science. Increasing pressure on materials can radically alter the physical and chemical properties of materials. Tremendous progress and breakthroughs in the development of ultrahigh-pressure diamond-anvil cell techniques have been made in the past several decades. For example, the behavior of materials at pressures comparable to those found near the Earth’s inner core (i.e., roughly to >300 GPa) can be studied under sustained conditions with unprecedented accuracy, precision, and sensitivity. High-pressure spectroscopy provides essential and often unique information about the properties of materials under these conditions. For instance, vibrational infrared (IR) spectroscopy provides detailed information on bonding properties of crystals, glass, and melts, thereby yielding a microscopic description of thermochemical properties. Infrared measurements also provide information on electronic excitations including crystal-field, charge-transfer, excitonic spectra of insulating and semiconducting materials, interband and intraband transitions in metals, and pressure-induced metallization of insulators.
Using synchrotron radiation for infrared studies substantially improves our ability to probe microscopic samples including in situ measurements under extreme P-T conditions due to its high brightness, broad-spectrum distribution, and diffraction-limited performance. In this presentation, I will introduce the developments of the synchrotron based infrared spectroscopy with diamond anvil cell techniques, an overview of the high-pressure IR facilities at National Synchrotron Light Source-II, Brookhaven National Laboratory, and related scientific highlights.
Date posted
Sep 21, 2023
Date updated
Sep 21, 2023