Raymond Jeanloz

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Jeanloz in 2011 Raymond Jeanloz at CTBTO Science and Technology conference.jpg
Jeanloz in 2011

Raymond Jeanloz is a professor of Earth and planetary science (EPS) and Astronomy at the University of California, Berkeley. [1] Educated at the California Institute of Technology, Amherst College and at Deep Springs College, [2] his research contributions have been fundamental to understanding of the composition of the Earth and the behavior of materials under high temperatures and pressures. [3] Jeanloz has created tools and experiments that enable him to recreate and study deep interior conditions in a laboratory setting, [4] He is working with colleagues to investigate the conditions inside supergiant exoplanets. [5]

Contents

Jeanloz has chaired the National Research Council Board on Earth Sciences and Resources. [6] He is a co-editor of the Annual Review of Earth and Planetary Sciences [7] and serves on the Board of Directors of Annual Reviews. [8]

Jeanloz is also active in connecting science and policy in areas including international policy, resources and the environment, and science education. [4] [9] He has been particularly prominent in informing national and international security and nuclear weapons policy, [9] chairing the Committee on International Security and Arms Control at the National Academy of Sciences. [10] In 2009 he received the Leo Szilard Lectureship Award from the American Physical Society for "contributions to development of sound public policy for nuclear weapons management and nuclear non-proliferation." [3] Jeanloz became an Annenberg Distinguished Visiting Fellow at Stanford University's Hoover Institution in 2012. [11]

Education

Raymond Jeanloz is one of four children of Roger W. Jeanloz, a professor in biological chemistry and molecular pharmacology at Harvard Medical School, and his wife Dorothea. [12] Raymond Jeanloz grew up in Massachusetts and spent two years at Deep Springs College, located in the Deep Springs Valley [2] between the White Mountains and Inyo Mountains in California. [13] His initial interests were in comparative literature and music. While he had some early exposure to geology, his interest in that field developed late in his undergraduate program. [14] Having also tried Hampshire College [4] [15] and taken a "gap period" of several months, Jeanloz completed his B.A. in geology at Amherst College in Massachusetts in 1975. [16] [14]

Jeanloz applied to the California Institute of Technology (Caltech) in part because of the Caltech Seismological Laboratory. His thesis advisor at Caltech was Thomas J. Ahrens. Jeanloz credits Ahrens and others for their mentorship and support, in helping him to learn about areas where he lacked scientific background and in encouraging him to explore new areas of research. [14] In 1979, Jeanloz received his Ph.D. from Caltech [16] for the thesis Physics of mantle and core minerals (1979). [17]

Career

Jeanloz joined the faculty at Harvard University in 1979, [4] working at the intersection of materials science and physics. [14] He taught there until 1981. [4] In 1982, [18] he moved to the University of California, Berkeley where he became a professor of Earth and planetary science and of Astronomy. [19]

Jeanloz is a member of the National Academy of Sciences. He advises the US Government, the University of California and its national laboratories on a wide variety of issues including national security. He has chaired the Committee on International Security and Arms Control, and has been recognized by the Federation of American Scientists and the American Physical Society for shaping government policy. [4] [10] [3]

Research

Jeanloz was an early researcher in mineral physics, and was one of those who proposed the field for recognition by the American Geophysical Union (AGU). [20] His work has connected mineral physics, chemistry, and materials science. [4] [16]

Nowadays, when people ask me, "What should I do?" I say, "Consider at least one possibility is to create a new field." – Raymond Jeanloz [14]

Jeanloz studies processes that occur under high temperatures and pressures, conditions that are characteristic of the interiors of planets and the core-mantle boundary of the Earth. [21] [22] [14] [15] Jeanloz studies planetary interiors and the properties of materials at high pressures to characterize the processes by which planets evolve over geological time periods. [23] [24] [14] [15] In the interiors of planets, pressure on materials can be millions of times higher than those at the Earth’s surface and materials can behave in very different ways. [4] Jeanloz has examined the properties and state equations of materials including alkali halides, alkaline-earth monoxides, silicate perovskite and iron. [15]

Jeanloz has created tools and experiments that enable him to recreate and study deep interior conditions in a laboratory setting, often by generating extremely high pressure in tiny amounts. [4] [24] He and his students have created new materials that can only be synthesized at extreme pressures, including ultra-hard diamond-like substances. [16] He has used diamond tips to simulate compression, creating diamond anvil cells capable of producing 4 to 5 million atmospheres, comparable to the pressures found at the center of the Earth. [25] He has created impact waves by shooting projectiles at high speeds, and generated high-energy laser pulses. [4] [24] He has furthered the use of techniques for shock-loading, deformation, spectroscopy, and phase equilibria. [15] By combining dynamic laser-induced shock waves and static diamond anvils, Jeanloz has found ways to study the behavior of materials at pressures that could range from millions to billions of atmospheres. This allows scientists to simulate conditions within giant and supergiant planets. [25] [26]

His research has led to greater understanding of how planets form, the composition of their interiors, and how those interiors behave. [4] [27] His research group is best known for experiments documenting that bridgmanite, [28] a high-pressure form of (Mg,Fe)SiO3, is the primary material making up Earth’s interior. [16] [25] He and his colleagues provided the first experimental determination of the temperature at Earth’s center, concluding that it is as hot as the Sun’s surface. [16] They also found evidence for chemical reactions between the rocky mantle and metallic core, likely making the core-mantle boundary one of Earth’s most dynamic regions. [16] [21] [22]

Jeanloz' group and their collaborators have modeled processes of diamond formation, indicating that diamonds may be hailing inside “icy” giant planets like Neptune. [29] They have helped characterize the primary constituents of giant planets and stars, the high-pressure fluid-metal forms of hydrogen and helium. They have determined that helium and hydrogen can form a metallic liquid alloy at the extreme pressures that occur at the cores of Jupiter and Saturn. [23] [30] [31] They have studied pressurized hydrogen and documented an insulator-to-metal transition in fluid hydrogen, identifying the conditions under which it turns into a metal. [32] [33] Their research also suggests that helium separates out of fluid metallic hydrogen inside Jupiter and Saturn, creating an immiscibility region in Jupiter and a four-layered planetary structure. [34]

In another collaboration Jeanloz has studied the behavior of a novel superionic form of water ice, one that is simultaneously liquid and solid and can conduct electricity as if it was a metal. The mantles of ice giant planets like Uranus and Neptune may contain superionic ice, possibly explaining some odd behaviors of their magnetic fields. [35] [36] His group’s experiments have also pioneered the discovery of crystal instabilities causing strain-induced amorphization and fracture-like processes, leading to new insights on how materials break. [37] [38]

Awards and honors

Selected publications

Materials science and physics

Nuclear policy

Related Research Articles

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References

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  2. 1 2 "Raymond Jeanloz | Earth 520: Plate Tectonics and People: Foundations of Solid Earth Science". Penn State University. Retrieved 26 July 2024.
  3. 1 2 3 4 "Leo Szilard Lectureship Award". American Physical Society. Retrieved 26 July 2024.
  4. 1 2 3 4 5 6 7 8 9 10 11 12 "The Benefits of a Life of Science: RAYMOND JEANLOZ '70" (PDF). DEEP SPRINGS COLLEGE ANNUAL REPORT 2015. 2015. Retrieved 26 July 2024.
  5. ↑ University of California Berkeley (2 May 2007). "UV laser, diamond can generate pressures close to those in cores of supergiant planets". Astrobiology.com (Press release). Archived from the original on 20 July 2012. Retrieved 28 February 2011.
  6. 1 2 3 4 5 6 7 8 9 "Raymond Jeanloz". Hoover Institution. Retrieved 26 July 2024.
  7. ↑ Jeanloz, Raymond; Freeman, Katherine H. (30 May 2014). "Introduction". Annual Review of Earth and Planetary Sciences. 42 (1): annurev–ea–42-051214-100001. Bibcode:2014AREPS..42.....J. doi:10.1146/annurev-ea-42-051214-100001 . Retrieved 15 September 2021.
  8. ↑ "Our Board of Directors". Annual Reviews. Retrieved 29 July 2024.
  9. 1 2 "Committee biographies". Fundamental Research in High Energy Density Science. National Academies Press. 1 June 2023. doi:10.17226/26728. ISBN   978-0-309-69414-8.
  10. 1 2 3 "Raymond Jeanloz to receive Hans Bethe Award". Lawrence Livermore National Laboratory. 6 September 2008. Retrieved 26 July 2024.
  11. ↑ "Raymond Jeanloz: Annenberg Distinguished Visiting Fellow". Hoover Institution. Stanford University. Retrieved 7 December 2018.
  12. ↑ Marquard, Bryan (28 September 2007). "Roger W. Jeanloz, Harvard professor who traveled the world; at 89". Boston Globe. Boston.com. Retrieved 9 December 2018.
  13. ↑ Lustig, L. K. (1965). Clastic sedimentation in Deep Springs Valley, California. Washington: United States Department of the Interior, Geological Survey. doi:10.3133/pp352F.
  14. 1 2 3 4 5 6 7 Zierler, David (24 August 2022). "Raymond Jeanloz (PhD '79), Earth and Planetary Scientist". Caltech Heritage Project. Retrieved 26 July 2024.
  15. 1 2 3 4 5 6 Carmichael, Ian S. (June 1, 1989). "Presentation of the Mineralogical Society of America Award for 1988 to Raymond Jeanloz" (PDF). American Mineralogist. 74 (5–6): 719. Retrieved 26 July 2024.
  16. 1 2 3 4 5 6 7 "Raymond Jeanloz". Macarthur Foundation.
  17. ↑ Jeanloz, Raymond (1980). Physics of Mantle and Core Minerals. California Institute of Technology.
  18. ↑ "Raymond JEANLOZ" (PDF). Department of Astronomy, University of California at Berkeley. Retrieved 29 July 2024.
  19. ↑ Medicine, National Academies of Sciences, Engineering, and; Sciences, Division on Engineering and Physical; Protection, Committee on National Security Space Defense and (30 August 2016). National Security Space Defense and Protection: Public Report. National Academies Press. p. 51. ISBN   978-0-309-44751-5 . Retrieved 29 July 2024.{{cite book}}: CS1 maint: multiple names: authors list (link)
  20. ↑ Liebermann, Robert Cooper (April 14, 2020). "About - Mineral and Rock Physics - History of MRP section". American Geophysical Union.
  21. 1 2 Sanders, Robert (29 January 2001). "Glitches in the Earth's wobble help geophysicists probe the planet's core". SpaceNews. Retrieved 29 July 2024.
  22. 1 2 Slesinger, Audrey (2001). "News Notes -- Redefining the Core-Mantle Boundary". Geotimes. No. January.
  23. 1 2 O'Neill, Ian (8 August 2008). "Could Jupiter and Saturn Contain Liquid Metal Helium?". Universe Today. Retrieved 29 July 2024.
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  25. 1 2 3 "UV laser, diamond can generate pressures close to those in cores of supergiant planets". SpaceNews. 2 May 2007.
  26. ↑ Fildes, Jonathan (22 May 2009). "Man-made star to unlock cosmic secrets". BBC News.
  27. ↑ Cartier, Kimberly M. S. (2020). "Remaking a Planet One Atom at a Time" (PDF). EOS. Vol. 101, no. 7. pp. 30–35.
  28. ↑ The name Bridgmanite became official in 2014. Earlier publications use the name perovskite. "Bridgmanite". mindat.org. Retrieved 5 August 2024.
  29. ↑ Kraus, Dominik (6 August 2018). "On Neptune, It's Raining Diamonds". American Scientist. Retrieved 6 August 2024.
  30. ↑ Stevenson, David J. (12 August 2008). "Metallic helium in massive planets". Proceedings of the National Academy of Sciences. 105 (32): 11035–11036. doi: 10.1073/pnas.0806430105 . ISSN   0027-8424.
  31. ↑ "Jupiter and Saturn full of liquid metal helium". phys.org. August 6, 2008.
  32. ↑ Bishop, Breanna (August 17, 2018). "NIF Reveals How Hydrogen Becomes Metallic in Giant Planets | National Ignition Facility & Photon Science". National Ignition Facility & Photon Science. Retrieved 30 July 2024.
  33. ↑ Sanders, Robert (20 August 2018). "Zapping hydrogen gas with 168 lasers turns it into a metal". Berkeley News.
  34. ↑ Lopatka, Alex (1 August 2021). "Squeezed hydrogen and helium don't mix". Physics Today. 74 (8): 18–19. doi:10.1063/pt.3.4810 . Retrieved 6 August 2024.
  35. ↑ Chang, Kenneth (2018-02-05). "New Form of Water, Both Liquid and Solid, Is 'Really Strange'". The New York Times. ISSN   0362-4331 . Retrieved 2024-07-30.
  36. ↑ Fessenden, Maris (February 6, 2018). "Scientists Make Weird Type of Ice Halfway Between Solid and Liquid". Smithsonian Magazine.
  37. ↑ Li, B. Y.; Li, A. C.; Zhao, S.; Meyers, M. A. (1 June 2022). "Amorphization by mechanical deformation". Materials Science and Engineering: R: Reports. 149: 100673. doi:10.1016/j.mser.2022.100673. ISSN   0927-796X . Retrieved 6 August 2024.
  38. ↑ Idrissi, Hosni; Carrez, Philippe; Cordier, Patrick (1 February 2022). "On amorphization as a deformation mechanism under high stresses". Current Opinion in Solid State and Materials Science. 26 (1): 100976. doi:10.1016/j.cossms.2021.100976. hdl: 20.500.12210/59104 . ISSN   1359-0286.
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  40. ↑ "People" (PDF). GSA News and information. June 1984. p. 91.
  41. ↑ "Fellows List". John D. and Catherine T. MacArthur Foundation. Archived from the original on 12 February 2010. Retrieved 6 February 2010.
  42. ↑ "Mineralogical Society of America - MSA Award". Mineralogical Society of America.
  43. ↑ "Fellowship in MSA". Mineralogical Society of America.
  44. ↑ "The MSA Award". MSA.
  45. ↑ "Elected Fellows". American Association for the Advancement of Science (AAAS).
  46. ↑ "List of Active Members by Class" (PDF). AAAS. 12 November 2009. Retrieved 6 February 2010.
  47. ↑ "Miller Institute for Basic Research in Science: Dedicated to the encouragement of creative research and investigation in the pure and applied sciences Miller Institute for Basic Research in Science" (PDF). UC Berkeley.
  48. ↑ "National Academy Announces New Members Seventy-two new members and 18 foreign associates elected". Science. 20 Apr 2004. doi:10.1126/article.34621 (inactive 1 November 2024).{{cite news}}: CS1 maint: DOI inactive as of November 2024 (link)
  49. ↑ "2008 Cozzarelli Prize recipients". Proceedings of the National Academy of Sciences of the United States of America. May 4, 2009. Retrieved 26 July 2024.
  50. ↑ "Reminiscences". Miller Institute.
  51. ↑ "Hoover Fellows". Stanford University. Retrieved 26 July 2024.
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