Mikalay Barysyevich (1923–2015): The Architect of Molecular Spectroscopy
Mikalay Alyaksandravich Barysyevich (widely known in Russian as Nikolai Borisevich) was a towering figure in Soviet and Belarusian physics. His work bridged the gap between fundamental molecular optics and practical quantum electronics, essentially teaching the world how complex molecules behave when they are liberated from the constraints of liquids and solids. As a decorated war veteran and the long-standing President of the Academy of Sciences of the BSSR, Barysyevich was as much a statesman of science as he was a pioneering researcher.
1. Biography: From the Resistance to the Laboratory
Mikalay Barysyevich was born on March 5, 1923, in the village of Lukovo, near Minsk, Belarus. His path to the heights of academia was violently interrupted by the Second World War. Following the Nazi invasion, the young Barysyevich joined the anti-fascist underground and later served as a scout in a partisan unit. After the liberation of Belarus, he joined the regular Red Army, seeing combat across Europe and ending the war in Czechoslovakia.
Returning to a decimated Minsk, he enrolled at the Belarusian State University (BSU), graduating from the Faculty of Physics and Mathematics in 1950. He moved to Leningrad (now St. Petersburg) for postgraduate studies at the prestigious Vavilov State Optical Institute, where he studied under the luminaries of Soviet optics.
In 1955, Barysyevich returned to Minsk to help establish the Institute of Physics of the Academy of Sciences of the BSSR. His leadership qualities were recognized early; he served as the Director of the Institute (1955–1969) and eventually as the President of the Academy of Sciences of the BSSR for nearly two decades (1969–1987). He remained active in research at the Institute of Molecular and Atomic Physics until his death on October 25, 2015.
2. Major Contributions: Molecules in the Mist
Barysyevich’s primary scientific achievement was the creation of a new field: the spectroscopy of free complex molecules.
- Luminescence in the Gas Phase: Before Barysyevich, most researchers studied complex organic molecules (like dyes) in liquid solutions. Barysyevich pioneered the study of these molecules in the "gas phase" (as vapors). This allowed him to observe the intrinsic properties of the molecules without the "noise" or interference caused by surrounding solvent molecules.
- Thermally Activated Delayed Fluorescence: He discovered a specific type of luminescence where a molecule absorbs light, gets "stuck" in a triplet state, and is later kicked back into an excited singlet state by thermal energy, causing it to glow after a delay. This discovery was fundamental to understanding energy conversion in organic systems.
- The "Universal Relation": Working with B.I. Stepanov, he refined the mathematical relationship between the absorption and emission spectra of complex molecules, a cornerstone of modern molecular optics known as the Stepanov-Borisevich relation.
- Gas-Phase Lasers: He was the first to achieve laser action (stimulated emission) using vapors of complex organic compounds. This opened the door to a new class of "dye lasers" that could be tuned to specific wavelengths and operated at high temperatures.
3. Notable Publications
Barysyevich authored over 600 scientific papers and several monographs that became standard texts for spectroscopists.
- Excited States of Complex Molecules in the Gas Phase (1967): This seminal monograph summarized his early work and established the theoretical framework for gas-phase spectroscopy.
- Spectroscopy of Free Complex Molecules (1992): Co-authored with colleagues, this work expanded on the dynamics of molecular vapors and their applications in quantum electronics.
- Infrared Filters (1971): A practical guide to the development of optical components based on his research into the interaction of light with matter.
4. Awards & Recognition
Barysyevich was one of the most decorated scientists in the Soviet Union and post-Soviet Belarus.
- Hero of Socialist Labor (1978): The highest civilian honor in the USSR.
- Lenin Prize (1980): Awarded for his work on the spectroscopy of free molecules and the development of gas-phase lasers.
- USSR State Prize (1973): For his contributions to the study of the luminescence of complex molecules.
- Order of Lenin (Four-time recipient): A testament to his sustained influence in Soviet science.
- Foreign Membership: He was elected to the Czechoslovak Academy of Sciences, the Polish Academy of Sciences, and was a Fellow of the European Academy of Sciences and Arts.
5. Impact & Legacy
Barysyevich is credited with founding the "Minsk School of Spectroscopy." Under his guidance, Belarus became a global hub for optics and laser physics. His work on the vapor phase of molecules was not merely academic; it laid the groundwork for modern analytical chemistry, environmental monitoring (detecting trace gases), and the development of organic light-emitting diodes (OLEDs), which rely on the very electronic transitions he mapped in the 1950s and 60s.
As President of the Academy, he oversaw the rapid modernization of Belarusian science, advocating for the integration of research with industrial production.
6. Collaborations
Barysyevich’s career was defined by his ability to lead and collaborate with other brilliant minds:
- B.I. Stepanov: The founder of the Belarusian school of physics and Barysyevich’s long-time colleague and mentor.
- V.V. Gruzinsky: A key collaborator in the development of the first vapor-phase dye lasers.
- The "Borisevich School": He mentored dozens of Doctors of Science and over 50 PhD students, many of whom now lead research institutes across the former Soviet Union and Europe.
7. Lesser-Known Facts
- Partisan Scout: During the war, Barysyevich served in the "Chekist" partisan brigade. His bravery in the field was later mirrored by his scientific courage in challenging established norms of physics.
- Chernobyl Response: As President of the Academy of Sciences in 1986, Barysyevich was thrust into the center of the Chernobyl disaster response. He was responsible for mobilizing Belarusian scientists to map radiation levels and assess the impact on the Republic’s agriculture and health, a role that required both scientific precision and political navigation.
- Scientific Longevity: Barysyevich remained a "working scientist" well into his 90s. He could often be found in his office at the Academy, reviewing the latest papers on femtosecond spectroscopy and mentoring the newest generation of physicists until shortly before his passing at age 92.