Irving Langmuir was born inBrooklyn, New York, on January 31, 1881. He was the third of the four children of Charles Langmuir and Sadie,née Comings. During his childhood, Langmuir's parents encouraged him to carefully observe nature and to keep a detailed record of his various observations. When Irving was eleven, it was discovered that he had poor eyesight.[5] When this problem was corrected, details that had previously eluded him were revealed, and his interest in the complications of nature was heightened.[6]
During his childhood, Langmuir was influenced by his older brother, Arthur Langmuir. Arthur was a research chemist who encouraged Irving to be curious about nature and how things work. Arthur helped Irving set up his first chemistry lab in the corner of his bedroom, and he was content to answer the myriad questions that Irving would pose. Langmuir'shobbies includedmountaineering,skiing,piloting his own plane, andclassical music. In addition to his professional interest in the politics of atomic energy, he was concerned about wilderness conservation.
Langmuir(center) in 1922 in his lab at GE, showing radio pioneerGuglielmo Marconi(right) a new 20 kW triode tubeGeneral Electric Company Pliotron
His initial contributions to science came from his study of light bulbs (a continuation of his PhD work). His first major development was the improvement of thediffusion pump, which ultimately led to the invention of the high-vacuum rectifier and amplifier tubes. A year later, he and colleagueLewi Tonks discovered that the lifetime of atungsten filament could be greatly lengthened by filling the bulb with aninert gas, such asargon, the critical factor (overlooked by other researchers) being the need for extreme cleanliness in all stages of the process. He also discovered that twisting the filament into a tight coil improved its efficiency. These were important developments in the history of theincandescent light bulb. His work in surface chemistry began at this point, when he discovered that molecular hydrogen introduced into a tungsten-filament bulb dissociated into atomic hydrogen and formed a layer one atom thick on the surface of the bulb.[9]
As he continued to study filaments in vacuum and different gas environments, he began to study the emission of charged particles from hot filaments (thermionic emission). He was one of the first scientists to work withplasmas, and he was the first to call these ionized gases by that name because they reminded him ofblood plasma.[11][12][13] Langmuir and Tonks discovered electron density waves in plasmas that are now known asLangmuir waves.[14]
He introduced the concept ofelectron temperature and in 1924 invented the diagnostic method for measuring both temperature anddensity with an electrostatic probe, now called aLangmuir probe and commonly used in plasma physics. The current of a biased probe tip is measured as a function of bias voltage to determine the local plasma temperature and density. He also discovered atomichydrogen, which he put to use by inventing theatomic hydrogen welding process; the first plasma weld ever made. Plasma welding has since been developed intogas tungsten arc welding.
In 1917, he published a paper on the chemistry of oil films[15] that later became the basis for the award of the 1932 Nobel Prize in chemistry. Langmuir theorized that oils consisting of analiphatic chain with ahydrophilic end group (perhaps analcohol oracid) were oriented as a film one molecule thick upon the surface of water, with the hydrophilic group down in the water and thehydrophobic chains clumped together on the surface. The thickness of the film could be easily determined from the known volume and area of the oil, which allowed investigation of the molecular configuration beforespectroscopic techniques were available.[16]
FollowingWorld War I Langmuir contributed to atomic theory and the understanding of atomic structure by defining the modern concept ofvalence shells andisotopes.
Based on his work at General Electric,John B. Taylor developed a detector ionizing beams of alkali metals,[18] called nowadays theLangmuir-Taylor detector. In 1927, he was one of the participants of the fifthSolvay Conference on Physics that took place at the International Solvay Institute for Physics in Belgium.
He joinedKatharine B. Blodgett to study thin films and surface adsorption. They introduced the concept of amonolayer (a layer of material one molecule thick) and the two-dimensional physics which describe such a surface. In 1932 he received theNobel Prize in Chemistry "for his discoveries and investigations insurface chemistry."In 1938, Langmuir's scientific interests began to turn toatmospheric science andmeteorology. One of his first ventures, although tangentially related, was a refutation of the claim of entomologistCharles H. T. Townsend that thedeer botfly flew at speeds of over 800 miles per hour. Langmuir estimated the fly's speed at 25 miles per hour.
After observingwindrows of drifting seaweed in theSargasso Sea he discovered a wind-driven surface circulation in the sea. It is now called theLangmuir circulation.
Langmuir's house in Schenectady
DuringWorld War II, Langmuir and Research AssociateVincent J Schaefer worked on improving navalsonar for submarine detection, and later to develop protective smoke screens and methods fordeicing aircraft wings. This research led him to theorize and then demonstrate in the laboratory and in the atmosphere, that the introduction of ice nucleidry ice andsilver iodide into a sufficiently moist cloud of low temperature (supercooled water) could induce precipitation (cloud seeding); though in frequent practice, particularly in Australia and the People's Republic of China, the efficiency of this technique remains controversial today.
In 1953 Langmuir coined the term "pathological science", describing research conducted with accordance to thescientific method, but tainted by unconscious bias or subjective effects. This is in contrast topseudoscience, which has no pretense of following the scientific method. In his original speech, he presentedESP andflying saucers as examples of pathological science; since then, the label has been applied topolywater andcold fusion.
Langmuir was married to Marion Mersereau (1883–1971) in 1912 with whom he adopted two children: Kenneth and Barbara. After a short illness, he died inWoods Hole, Massachusetts from a heart attack on August 16, 1957. His obituary ran on the front page ofThe New York Times.[19]
On his religious views, Langmuir was an agnostic.[20]
According to authorKurt Vonnegut, Langmuir was the inspiration for his fictional scientist Dr. Felix Hoenikker in the novelCat's Cradle,[21] and the character's invention ofice-nine, a new phase of water ice (similar in name only toIce IX). Langmuir had worked with Vonnegut's brother,Bernard Vonnegut at General Electric on seeding ice crystals to diminish or increase rain or storms.[22][23][24]
Langmuir equation, an equation that relates the coverage or adsorption of molecules on a solid surface to gas pressure or concentration of a medium above the solid surface at a fixed temperature
Langmuir wave, a rapid oscillation of the electron density in conducting media such as plasmas or metals
Langmuir states, three-dimensional quantum states of Helium when both electrons move in phase on Bohr circular orbits and mutually repel
^Suits, C. Guy., ed. (1962),Langmuir – The man and the scientist. Collected Works of Irving Langmuir, vol. 12, Pergamon Press,ASINB0007EIFMO ASIN states author is Albert Rosenfeld; does not name an editor or state a volume.
^Albert Rosenfeld (1961).The Quintessence of Irving Langmuir. Pergamon Press. p. 150.Though Marion herself was not an assiduous churchgoer and had no serious objection to Irving's agnostic views, her grandfather had been an Episcopalian clergyman.
^Musil, Robert K. (August 2, 1980). "There Must Be More to Love Than Death: A Conversation With Kurt Vonnegut".The Nation.231 (4):128–132.ISSN0027-8378.
Schaefer, Vincent J. (April 1, 2013). Rittner, Don (ed.).Serendipity in Science: Twenty Years at Langmuir University. Voorheesville, N.Y: Square Circle Press.ISBN978-0-9856926-3-6.OCLC861734914.
