Prof Zeev Luz
Prof Anatoly Burshtein
Prof. Zeev Luz (1932-2018)
Zeev Luz passed away October 2, 2018. Until about half a year ago he would still come every day to his office in the Perlman Building of the Weizmann Institute, and would work on modeling dynamic lineshapes, on characterizing the influence of chirality on NMR spectra, and on perfecting his recently gained Matlab skills by performing numerical simulations on “the physics of soap bubbles”. His door was never closed, and both professors and graduate students could always come in and discuss issues with him. Discussing with Zeev meant asking a question, and receiving in reply a set of questions that would in turn guide us to the answer. For us Zeev was a mentor, a dear friend, and an ultimate example of a curious scientist endowed with a unique ability to explain the most complex ideas in a clear and accurate manner.
Zeev Luz was born Wolfgang Emmanuel Nussbaum, in Munich on Feb 20 1932. It didn't take long for Luz’s family to fathom which way the winds were blowing then and there, and in the summer of 1934 they settled in the village of Binyamina in the Palestine Mandate, where his father served as the region’s doctor. Zeev’s childhood was anything but boring, and included attending an agricultural boarding school that offered him a university scholarship in exchange for remaining as school teacher (a position in which he became acquainted with Alex Pines, another of the school’s boardees). Zeev’s research career started in 1957, when he arrived to the Weizmann Institute after receiving his BSc and MSc degrees in Chemistry from the Hebrew University. At Weizmann he became the youngest member in the research group of Shaul Meiboom, spending half the week teaching in his high school and the other half (including weekends, holidays and frequent teachers’ strikes) working in the lab. By then Meiboom had constructed one of the world’s first NMR spectrometers, and together with Zeev and other members of his group they were doing pioneering work on the quantum interpretation of spin-spin couplings and their influence on NMR spectra, showing the potential of NMR to study the nature and the kinetics of chemical reactions, discovering the double quantum effects in NMR, and introducing new pulse sequences such the CPMG train. Meiboom departed Weizmann for the Bell Labs in 1958, where Zeev joined him as a postdoc after completing his PhD in 1961. There he studied by ESR and NMR the complexation of paramagnetic metal ions in solution, with an emphasis on chemical dynamics. These works formed the basis for understanding the solvation of metal ions, and the essential processes underlying paramagnetic relaxation.
Zeev Luz rejoined the Weizmann as an independent researcher in 1964, and started his own research group at the Isotopes Department focusing on ESR and NMR spectroscopies. In those CW days he laid down groundwork on the use of 17O-NMR to study chemical reactions at equilibrium, and to understand the molecular structure of organic crystals. In addition he advanced the understanding of the hyperfine interaction in free radicals. Later on he became interested in the molecular structure and dynamics of liquid crystals, and utilized NMR’s unique features to better understand the molecular motion, macroscopic order and phase transitions in these materials. Luz and his group also studied the behavior of small molecules dissolved in a variety of lyotropic and thermotropic liquid crystalline phases, in a series of combined theoretical and experimental studies that help him lay down the pillars of this field. A common denominator of these studies was using magnetic resonance for studying dynamics of molecules. For that purpose new experimental methodologies were designed, and mathematical tools were created to interpret the results in terms of motional mechanisms and rate constants. In the 1970’s he developed, together with his colleague and close friend Shlomo Alexander, new theoretical and computational approaches to interpret lineshapes in ESR and NMR of molecules undergoing dynamic processes including conformational changes, rotational and translational diffusions and chemical exchange. Over the years Zeev’s experimental methods became more sophisticated, and together with Raphy Poupko, Herbert Zimmermann, Hans Spiess and others, he developed during over three decades new 1D and 2D NMR methods to follow slow dynamic process in solids .
In addition to a vast amount of research on the interplay between magnetic resonance, the structure of materials and molecular dynamics, Zeev educated and promoted generations of scientists in Israel and elsewhere. He was an exceptional educator who gave spectacular lectures about Science to layman audiences –particularly to middle- and high-school students, which he visited often and hosted at Rehovot’s numerous scientific festivals. Most sought-after among his lectures was one on the physics of soap bubbles, where with enthusiasm he showed kids on huge projected experiments the magic of differential equations and of their solutions – even long after he had himself lost the ability to see due to macular degeneration. He greatly stimulated the establishment and flourishing of Magnetic Resonance in Israel, while also being a major and influential figure in the Weizmann Institute. As the latter, he served as department chair, chair of the Chemistry board of studies, dean of Chemistry and vice president for academic affairs – all of these demanding administrative positions, but which never affected his research performance nor level of innovation. Zeev was also a particularly warm host to the many students, post-docs and visiting scientists from all over the world that came to work with him: to them, and to us, he and his late wife Abigail opened their house numerous times.
To all of us that knew him personally, Zeev Luz was and will remain a role model both inside and outside the lab; a “mentsch” in every respect. We shall miss him dearly.
Daniella Goldfarb, Lucio Frydman and Shimon Vega
Rehovot, October 2018
Prof. Anatoly Burshtein (1935-2020)
Personal memories of Anatoly Burshtein, by Yehiam Prior
It all started one day in 1987 or so, when someone knocked on my office door, introduced himself as Dr. Avram Kofman, a recent Oleh from the USSR, and said he was looking for a position. "where did you study?" – "Novosibirsk, with Professor Anatoly Burshtein". At that time I did not know, nor have I ever heard of Professor Burshtein and his group. However, a couple of hours later, when Dr. Kofman presented some of his papers with Professor Burshtein, I was very impressed. Their work covered exactly the topics we were struggling with, and they were far more advanced than us in their understanding of random noise and phase fluctuations in light-matter interactions. Dr. Kofman was hired that same day.
A couple of years later, at the Rochester conference in 1989, I met Anatoly in person, and my appreciation of his deep physical understanding and broad physical background grew even more. At the end of that week, and the following year at the Vavilov conference in Novosibirsk, where Anatoly hosted me and my wife, and as our friendship started to develop, I raised with Anatoly the option of his moving to Israel. Those were Perestroika days. Anatoly, who had been a social activist all his life, was very enthusiastic about the developments in his country, wanted to be part of history being made, and would not even consider such a move. However, following a short working visit to Weizmann, and eventually a sabbatical year in Israel, I was thrilled when Professor Burshtein decided to join us at the department of Chemical physics at the Weizmann Institute of Science.
At the Weizmann Institute, Anatoly had a second blossoming period, diving deeper and deeper into very complex problems in thermodynamics and kinetics of chemical systems. His very fundamental contributions to the fields of light matter interaction, statistical properties of light, thermodynamic processes in liquids and in chemical reactions, are but a few areas where his deep physical understanding and intuition, and impressive mathematical capabilities led him to his unique stature among his peers.
During these last three decades, Anatoly was very productive - has published over 100 scientific papers some of which were cited over 100 times, has collaborated with a large number of people in Israel and abroad, contributed understanding to experimental works and promoted new theoretical concepts and theories, all of this at a stage of life when many people choose to rest on their laurels. A noteworthy characteristic of his personality and upbringing is his desire to work, hands-on, by himself, on the scientific problem of the moment. Thus, in many of his papers, including two extensive review articles published years after his arrival in Israel, he is the sole author.
I cherish our many conversations on science and on world issues, and his memory is dear to me. May he rest in peace.
Yehiam Prior (former Dean of Chemistry, Weizmann Institute of Science)