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Portrait of John C. Polanyi
Photo: Bengt Oberger, Own work · CC BY-SA 4.0 via Wikimedia Commons

Nobel Prize in Chemistry · 1986

John C. Polanyi

He read the faint infrared glow of newborn molecules to see how chemical reactions happen, and his idea led to the chemical laser.

The Nobel citation: “for their contributions concerning the dynamics of chemical elementary processes”
Born
January 23, 1929, Berlin, Germany
Shared with
Dudley R. Herschbach, Yuan T. Lee
Affiliation at the time
University of Toronto, Canada

Chemistry prize

1986

Shared with 2 other laureates.

Age that year

57years

Born in 1929.

Sources cited

17

Fact-checked September 24, 2026.

  • His 1958 experiment ran on a neon-sign transformer and an infrared spectrometer borrowed from the whole chemistry department.
  • Physical Review Letters rejected his 1960 proposal for a chemical laser as lacking scientific interest. Another journal published the same manuscript.
  • His family left Berlin in 1933, when he was four, as Nazi attacks on Jewish intellectuals ended his father's career in Germany.
  • At 11, with Germany bombing Britain, he was sent to Canada and lived with a Toronto family for three years.
  • He was the founding chair of the Canadian Pugwash Group, which works against nuclear weapons, from 1960 to 1978.

The breakthrough

Infrared chemiluminescence and the energy of newborn molecules, 1958-1967

A chemical reaction happens when molecules collide and swap atoms. By the 1950s chemists could measure how fast reactions ran overall, but not what happened in the instant when old bonds broke and new ones formed. Polanyi's idea was to study the newborn product molecules, because the forces at work during the collision leave their mark on how those molecules move. In 1958, with his student Kenneth Cashion, he mixed hydrogen atoms with chlorine gas at low pressure. The vessel stayed cold to the touch, yet the new hydrogen chloride molecules gave off faint infrared light, the glow of molecules vibrating and spinning as hard as if they were thousands of degrees hot. Reading that light, which he called infrared chemiluminescence, showed how the reaction's energy was shared out between vibration, rotation and forward motion. Think of working out how a firework was packed from the pattern of its sparks. By 1967 his group was catching the products on walls chilled with liquid nitrogen before collisions could blur the signal, so they could measure the rate of reaction into each separate energy state. Computer simulations then tied these patterns to the shape of the energy landscape that steers a reaction, including where its main barrier sits. One lesson: for uphill reactions, energy works best when it arrives as vibration that stretches the bond under attack.[2],[3],[5]

“When, as we must often do, we fear science, we really fear ourselves. Human dignity is better served by embracing knowledge.”
John C. Polanyi, Speech at the Nobel Banquet, Stockholm, 10 December 1986.[4]

What it meant for humanity

Polanyi's work did not produce a drug or a crop. What it changed was understanding. Along with the molecular-beam experiments of Dudley Herschbach and Yuan Lee, his method helped create reaction dynamics, a field that watches single chemical events rather than averages over trillions of them. The Swedish Academy said the three laureates gave chemists a much more detailed picture of how reactions take place. His measurements of how reaction energy is shared out were for years the most complete available for any reaction, and theorists used them as a test bed for their models. The Academy also called his method a first step toward the laser-based techniques that later took over the field. The most concrete result was an idea. In 1960 he proposed that molecules left vibrating by a chemical reaction could power a laser. In 1965 George Pimentel's group built the first chemical laser, using the same hydrogen-chlorine chemistry Polanyi had studied. Chemical and vibrational lasers grew into the most powerful sources of infrared light yet developed, and chemical lasers have been used in industry for cutting and drilling. After 1986 his laboratory used scanning tunnelling microscopes to watch reactions between single molecules on surfaces, work linked to building devices atom by atom. Beyond the lab, he spent decades arguing for nuclear arms control, for scholarly freedom and for funding curiosity-driven science. Ontario named research prizes for young scientists after him, and Canada's science funding council named a major award after him.

  • With Herschbach and Lee, he helped found reaction dynamics, which the Swedish Academy said gave a much more detailed understanding of how chemical reactions take place.[2]
  • His 1960 proposal for a laser powered by molecules left vibrating after a reaction was realized in 1965 as the first chemical laser, using the same hydrogen-chlorine chemistry he had studied.[3],[5],[15]
  • Chemical and vibrational lasers grew into the most powerful sources of infrared radiation yet developed, and chemical lasers have been used in industry for cutting and drilling.[5],[7],[15]
  • He chaired the Canadian Pugwash Group from its founding in 1960 until 1978, and by 1988 he had published some seventy articles on survival in the nuclear age.[5],[6]
  • Ontario's John Charles Polanyi Prizes support early-career researchers, and Canada's science funding council gives a John C. Polanyi Award for outstanding advances made in Canada.[16]

Impact in numbers

Polanyi's main gift was a way of seeing. By reading the faint infrared light of molecules just born in a reaction, he and his students worked out how reaction energy flows into vibration, rotation and motion, and what the forces at the moment of reaction must look like. With the molecular-beam work of Herschbach and Lee, this helped turn reaction dynamics into a field of its own. His 1960 insight that a reaction could pump a laser gave rise to chemical lasers, the most powerful infrared sources ever built. They served industry and research, but their largest versions were weapons prototypes. No credible published figure puts a number on the lives or dollars this work changed, so we make no numerical claim. Alongside his science, he spent more than six decades pressing for nuclear arms control, scholarly freedom and support for basic research.

Fundamental scienceTechnologyPeace

No number is given here on purpose. Some contributions cannot be counted honestly, and we would rather describe them than invent a figure.

The double edge

The chemical laser that grew out of Polanyi's 1960 proposal became a weapons technology. Its most powerful versions were built for the military. MIRACL, a megawatt deuterium fluoride laser built for the US Navy and first fired in 1980, was used in a 1997 US Army test against a US Air Force satellite. The joint US-Israeli THEL, another chemical laser, shot down 25 Katyusha rockets in tests in 2000 and 2001. We found no record of anyone killed by a chemical laser weapon, and the US Defense Department stopped developing chemical lasers in 2012. We found no record that Polanyi worked on these weapons. He has spent his public life opposing arms races, and in 2003 he criticized US national missile defence as a path of fortress-building in which weapons only lead to more weapons.

  • Moderate

    The chemical laser became a weapons technology

    High-power chemical lasers descended from his proposal were developed largely as weapons. MIRACL, a megawatt deuterium fluoride laser, was used in a 1997 US test against a satellite, and the US-Israeli THEL destroyed 25 rockets in 2000-2001 tests. We found no record of combat deaths or that Polanyi took part; he has long opposed arms races, including missile defence.[5],[7],[13],[14],[15],[17]

Against the odds

Polanyi was born in Berlin in 1929, where his father Michael was one of Germany's leading physical chemists at the Kaiser Wilhelm institutes. In April 1933, soon after Hitler took power, a new Nazi law ordered civil servants who were not of 'Aryan descent' to be retired. It was the first major law aimed at Jews. Michael Polanyi had been born Jewish, and although he had become a Christian, the Nazis still counted him as a Jew. Faced with repeated attacks on Jewish intellectuals, he took a chair created for him at the University of Manchester, and the family left for England when John was four. They were not safe there either. Michael's name appeared on the Nazis' list of people to arrest if Germany invaded Britain. In 1940, as German bombs fell on British cities, John was sent across the Atlantic at age 11 and spent three years with a family in Toronto. Relatives left behind suffered worse. His aunt Sophie, her husband and two of their three children died in concentration camps. Polanyi's own career in Britain, the United States and Canada met no barriers that we could document.

  • 1933

    Persecution

    The Nazi civil service law of April 1933 ordered 'non-Aryan' civil servants retired. For his father, born Jewish, Hitler's rise and repeated attacks on Jewish intellectuals ended his career in Germany.[10],[12]

  • 1933

    Exile

    At four, he left Berlin with his family for Manchester, England, where his father took a chair in physical chemistry.[1],[10]

  • —

    Persecution

    His father was among about 2,300 people on the Nazis' Special Search List, marked for arrest and handover to the Gestapo if Germany invaded Britain.[9]

  • 1940

    War

    At 11, with Germany bombing Britain, he was sent to Canada for safety and lived with a Toronto family for three years.[7]

  • —

    Family killed

    His father's sister Sophie, her husband Egon Szecsi and two of their three children died in concentration camps. His aunt Laura's efforts to get them out failed.[11]

Jewish background

Both parents JewishRelationship to Jewish identity not documented

Both of Polanyi's parents were born Jewish. His father, the chemist and philosopher Michael Polanyi, was the son of secular Jewish parents in Budapest, where the family name was originally Pollacsek. Michael became a Christian as a young man and married in a Roman Catholic ceremony. John's mother, Magda Kemény, was born to two Jewish parents, and her birth is listed in Hungarian Jewish birth records. Under Nazi racial rules the family counted as Jewish, and Nazi attacks on Jewish intellectuals led them to leave Germany in 1933. We found no source on John Polanyi's own religious practice or on how he regards his Jewish heritage.[8],[9],[10]

Key dates

  1. January 23, 1929

    Born in Berlin to Hungarian parents, the chemist Michael Polanyi and Magda Kemény.[1]

  2. 1933

    After the Nazis take power, the family leaves Germany for Manchester, England.[1],[10]

  3. 1940

    Sent to Canada at 11 to escape German bombing of Britain; lives with a Toronto family for three years.[7]

  4. 1952

    Earns a PhD at Manchester University for measuring the strengths of chemical bonds, then starts postdoctoral work in Ottawa.[1],[5]

  5. 1956

    After two years at Princeton, joins the University of Toronto as a lecturer in chemistry.[1]

  6. 1958

    With student Kenneth Cashion, first reports infrared chemiluminescence from newly formed hydrogen chloride.[3],[5]

  7. 1960

    Proposes a laser powered by vibrating molecules; rejected by Physical Review Letters, it is published elsewhere in 1960-61.[3],[5],[15]

  8. 1960

    Becomes founding chair of the Canadian Pugwash Group, a post he holds until 1978.[5],[6]

  9. 1967

    His group's 'arrested relaxation' method yields the first rates of reaction into individual product energy states.[3],[5]

  10. 1974

    Named University Professor at Toronto and made an Officer of the Order of Canada.[1]

  11. 1982

    Shares the Wolf Prize in Chemistry with George Pimentel.[1]

  12. October 15, 1986

    Awarded the Nobel Prize in Chemistry with Dudley Herschbach and Yuan T. Lee for the dynamics of chemical elementary processes.[2]

  13. 2022

    Receives the American Physical Society's Andrei Sakharov Prize for decades of activism for a world without nuclear weapons.[6],[16]

Sources

  1. 1.John C. Polanyi – Biographical · NobelPrize.org (Nobel Prize Outreach), 1986
  2. 2.Press release: The 1986 Nobel Prize in Chemistry · NobelPrize.org (Royal Swedish Academy of Sciences), 1986
  3. 3.Some Concepts in Reaction Dynamics (Nobel Lecture, 8 December 1986) · NobelPrize.org (Nobel Foundation), 1986
  4. 4.John C. Polanyi – Banquet speech · NobelPrize.org (Nobel Foundation), 1986
  5. 5.John Charles Polanyi, Killam Laureate 1988: Profile · John Polanyi official website, University of Toronto, 1988
  6. 6.John Charles Polanyi · The Canadian Encyclopedia (Historica Canada)
  7. 7.John Charles Polanyi: Physical Chemistry · Science.ca
  8. 8.Jewish Nobel Prize Winners in Chemistry (note 8) · Jinfo.org
  9. 9.Michael Polanyi · Wikipedia
  10. 10.Guide to the Michael Polanyi Papers 1900-1975: Biographical Note · Hanna Holborn Gray Special Collections Research Center, University of Chicago Library, 2009
  11. 11.Laura Polanyi 1882-1957: Narratives of a Life (Judit Szapor) · Polanyiana, KFKI Budapest, 1997
  12. 12.Law for the Restoration of the Professional Civil Service · United States Holocaust Memorial Museum, Holocaust Encyclopedia
  13. 13.Mid-Infrared Advanced Chemical Laser (MIRACL) · GlobalSecurity.org
  14. 14.Tactical High Energy Laser (THEL) · GlobalSecurity.org
  15. 15.Chemical laser · Wikipedia
  16. 16.John Polanyi · Wikipedia
  17. 17.The last thing we need is missile defence (op-ed, 7 May 2003) · The Globe and Mail, by John Polanyi (copy on his official website, University of Toronto), 2003

Fact-checked on September 24, 2026 by a separate AI fact-checking pass that re-opened the sources, with 8 corrections made. How we check

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