Hans Robert Griem (May 5 1930 – May 28 2019) was a German‑born American physicist renowned for his contributions to plasma spectroscopy and the theory of Stark broadening. He authored several influential textbooks and conducted research that advanced diagnostic techniques for high‑temperature plasmas, including those used in inertial‑confinement‑fusion experiments.
Early life and education
Griem was born in Berlin, Germany. He earned his doctorate in physics (Ph.D.) in the early 1950s, subsequently relocating to the United States to pursue an academic and research career. Specific details of his doctoral institution and dissertation are not widely documented in publicly available encyclopedic sources.
Academic and research career
After completing his doctoral studies, Griem held research positions at U.S. government laboratories, notably the U.S. Naval Research Laboratory, where he began work on plasma diagnostics. In 1975 he joined the faculty of the Department of Physics at the University of Maryland, College Park, where he remained until his retirement in the late 1990s. During his tenure he supervised graduate students, directed laboratory research, and collaborated with national laboratories on plasma‑physics projects.
Scientific contributions
- Stark broadening theory – Griem developed and refined theoretical models describing the broadening and shifting of spectral lines in ionized gases under the influence of electric fields (the Stark effect). His formulations for hydrogen and helium lines are widely cited and form the basis for quantitative plasma diagnostics.
- Plasma spectroscopy – He advanced techniques for measuring electron temperature, density, and ion composition by interpreting emitted and absorbed radiation from plasmas.
- Inertial‑confinement‑fusion diagnostics – Griem’s methods were incorporated into diagnostic suites for laser‑driven fusion experiments, aiding the interpretation of spectra from high‑energy-density plasmas.
Publications
Griem authored several seminal texts, including:
- Plasma Spectroscopy (1974) – a comprehensive treatment of spectroscopic methods applied to plasmas.
- Principles of Plasma Spectroscopy (1991, 2nd ed. 1997) – an updated reference covering theory, instrumentation, and applications.
He also contributed numerous peer‑reviewed articles on line broadening, plasma diagnostics, and related topics.
Awards and honors
Griem received multiple recognitions for his work, among them:
- Fellowship of the American Physical Society (APS).
- William F. Meggers Award from the Optical Society of America, acknowledging outstanding contributions to spectroscopy.
Details of additional honors, such as membership in national academies, are not extensively documented in readily accessible encyclopedic references.
Later life and legacy
After retiring from active research, Griem remained an emeritus professor and continued to be consulted for his expertise in plasma diagnostics. He passed away on May 28 2019. His textbooks and theoretical models continue to be integral to the training of plasma physicists and to the analysis of spectroscopic data in both laboratory and astrophysical plasmas.