Francis William Aston FRS (1 September 1877 – 20 November 1945) was a British

chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe t ...

and

physicist A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate cau ...

who won the 1922

Nobel Prize in Chemistry ) , image = Nobel Prize.png , alt = A golden medallion with an embossed image of a bearded man facing left in profile. To the left of the man is the text "ALFR•" then "NOBEL", and on the right, the text (smaller) "NAT•" then "M ...

for his discovery, by means of his

mass spectrograph Mass spectrometry (MS) is an analytical technique that is used to measure the mass-to-charge ratio of ions. The results are presented as a '' mass spectrum'', a plot of intensity as a function of the mass-to-charge ratio. Mass spectrometry is us ...

, of isotopes in many non-radioactive elements and for his enunciation of the

whole number rule In chemistry, the whole number rule states that the masses of the isotopes are whole number multiples of the mass of the hydrogen atom. The rule is a modified version of Prout's hypothesis proposed in 1815, to the effect that atomic weights are mu ...

. He was a fellow of the

Royal Society The Royal Society, formally The Royal Society of London for Improving Natural Knowledge, is a learned society and the United Kingdom's national academy of sciences. The society fulfils a number of roles: promoting science and its benefits, re ...

and Fellow of

Trinity College, Cambridge Trinity College is a constituent college of the University of Cambridge. Founded in 1546 by King Henry VIII, Trinity is one of the largest Cambridge colleges, with the largest financial endowment of any college at either Cambridge or Oxford. ...

Biography

Early life

Francis Aston was born in

Harborne Harborne is an area of south-west Birmingham, England. It is one of the most affluent areas of the Midlands, southwest from Birmingham city centre. It is a Birmingham City Council ward in the formal district and in the parliamentary constitu ...

, now part of Birmingham, on 1 September 1877. He was the third child and second son of William Aston and Fanny Charlotte Hollis. He was educated at the Harborne Vicarage School and later Malvern College in Worcestershire where he was a boarder. In 1893 Francis William Aston began his university studies at

Mason College Mason Science College was a university college in Birmingham, England, and a predecessor college of Birmingham University. Founded in 1875 by industrialist and philanthropist Sir Josiah Mason, the college was incorporated into the University ...

(which was then external college of University of London) where he was taught physics by

John Henry Poynting John Henry Poynting FRS (9 September 185230 March 1914) was an English physicist. He was the first professor of physics at Mason Science College from 1880 to 1900, and then the successor institution, the University of Birmingham until his deat ...

and chemistry by Frankland and Tilden. From 1896 on he conducted additional research on

organic chemistry Organic chemistry is a subdiscipline within chemistry involving the scientific study of the structure, properties, and reactions of organic compounds and organic materials, i.e., matter in its various forms that contain carbon atoms.Clayden, ...

in a private laboratory at his father's house. In 1898 he started as a student of Frankland financed by a Forster Scholarship; his work concerned optical properties of

tartaric acid Tartaric acid is a white, crystalline organic acid that occurs naturally in many fruits, most notably in grapes, but also in bananas, tamarinds, and citrus. Its salt, potassium bitartrate, commonly known as cream of tartar, develops naturally ...

compounds. He started to work on fermentation chemistry at the school of brewing in Birmingham and was employed by W. Butler & Co. Brewery in 1900. This period of employment ended in 1903 when he returned to the University of Birmingham under Poynting as an Associate.

Research

With a scholarship from the

University of Birmingham The University of Birmingham (informally Birmingham University) is a Public university, public research university located in Edgbaston, Birmingham, United Kingdom. It received its royal charter in 1900 as a successor to Queen's College, Birmingha ...

, he pursued research in physics following the discovery of

X-rays An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30&nbs ...

and radioactivity in the mid-1890s. Aston studied the current through a

gas-filled tube A gas-filled tube, also commonly known as a discharge tube or formerly as a Plücker tube, is an arrangement of electrodes in a gas within an insulating, temperature-resistant envelope. Gas-filled tubes exploit phenomena related to electric ...

. The research, conducted with self-made discharge tubes, led him to investigate the volume of the Aston dark space. After the death of his father, and a trip around the world in 1908, he was appointed lecturer at the University of Birmingham in 1909 but moved to the Cavendish Laboratory in

Cambridge Cambridge ( ) is a College town, university city and the county town in Cambridgeshire, England. It is located on the River Cam approximately north of London. As of the 2021 United Kingdom census, the population of Cambridge was 145,700. Cam ...

on the invitation of

J. J. Thomson Sir Joseph John Thomson (18 December 1856 – 30 August 1940) was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered. In 1897, Thomson showed that ...

in 1910. Birmingham University awarded him a BSc in Applied/Pure Science in 1910 and a DSc in Applied/Pure Science in 1914. Joseph John Thomson revealed the nature of the

cathode ray Cathode rays or electron beam (e-beam) are streams of electrons observed in discharge tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, glass behind the positive electrode is observed to glow, due to el ...

and then discovered the electron and he was now doing research on the positively charged " Kanalstrahlen" discovered by

Eugen Goldstein Eugen Goldstein (; 5 September 1850 – 25 December 1930) was a German physicist. He was an early investigator of discharge tubes, the discoverer of anode rays or canal rays, later identified as positive ions in the gas phase including the h ...

in 1886. The method of deflecting particles in the "Kanalstrahlen" by magnetic fields was discovered by

Wilhelm Wien Wilhelm Carl Werner Otto Fritz Franz Wien (; 13 January 1864 – 30 August 1928) was a German physicist who, in 1893, used theories about heat and electromagnetism to deduce Wien's displacement law, which calculates the emission of a blackbody ...

in 1908; combining magnetic and electric fields allowed the separation of different ions by their ratio of charge and mass. Ions of a particular charge/mass ratio would leave a characteristic parabolic trace on a photographic plate, demonstrating for the first time that atoms of a single element could have different masses. The first sector field

mass spectrometer Mass spectrometry (MS) is an analytical technique that is used to measure the mass-to-charge ratio of ions. The results are presented as a '' mass spectrum'', a plot of intensity as a function of the mass-to-charge ratio. Mass spectrometry is us ...

was the result of these experiments. Early Mass Spectrometer (replica)

It was speculations about isotopy that directly gave rise to the building of a mass spectrometer capable of separating the isotopes of the chemical elements. Aston initially worked on the identification of

isotope Isotopes are two or more types of atoms that have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), and that differ in nucleon numbers (mass numb ...

s in the element neon and later chlorine and mercury.

First World War World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

stalled and delayed his research on providing experimental proof for the existence of isotopes by mass spectroscopy and during the war, Aston worked at the Royal Aircraft Establishment in Farnborough as a Technical Assistant working on aeronautical coatings. After the war, he returned to research at the Cavendish Laboratory in Cambridge and completed building his first

that he reported on in 1919. Subsequent improvements in the instrument led to the development of a second and third instrument of improved mass resolving power and mass accuracy. These instruments employing electromagnetic focusing allowed him to identify 212 naturally occurring isotopes. In 1921, Aston became a member of the International Committee on Atomic Weights and a fellow of the

and received the

the following year. His work on isotopes also led to his formulation of the

which states that "the mass of the oxygen isotope being defined s 16 all the other isotopes have masses that are very nearly whole numbers," a rule that was used extensively in the development of

nuclear energy Nuclear energy may refer to: *Nuclear power, the use of sustained nuclear fission or nuclear fusion to generate heat and electricity * Nuclear binding energy, the energy needed to fuse or split a nucleus of an atom *Nuclear potential energy ...

. The exact mass of many isotopes was measured leading to the result that hydrogen has a 1% higher mass than expected by the average mass of the other elements. Aston speculated about the subatomic energy and the use of it in 1936. ''Isotopes'' and ''Mass-spectra and Isotopes'' are his most well-known books.

Private life and death

In his private life, he was a sportsman, cross-country skiing and

skating Skating involves any sports or recreational activity which consists of traveling on surfaces or on ice using skates, and may refer to: Ice Skating *Ice skating, moving on ice by using ice skates **Figure skating, a sport in which individuals, ...

in winter time, during his regular visits to Switzerland and

Norway Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and the ...

; deprived of these winter sports during the

he started climbing. Between the ages of 20 and 25 he spent a large part of his spare time cycling. With the invention of

motorised vehicle Motorized may refer to: * Motor vehicle ** especially an automobile * Motorized military unit—see Armoured warfare * any item containing a motor An engine or motor is a machine designed to convert one or more forms of energy into mechanic ...

s he constructed a combustion engine of his own in 1902 and participated in the Gordon Bennett auto race in Ireland in 1903. Not content with these sports he also engaged in swimming, golf, especially with Rutherford and other colleagues in Cambridge, tennis, winning some prizes at open tournaments in England

Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...

and Ireland and learning surfing in

Honolulu Honolulu (; ) is the capital and largest city of the U.S. state of Hawaii, which is in the Pacific Ocean. It is an unincorporated county seat of the consolidated City and County of Honolulu, situated along the southeast coast of the island ...

in 1909. Coming from a musical family, he was capable of playing the piano, violin and cello at a level such that he regularly played in concerts at Cambridge. He visited many places around the globe on extensive travel tours starting from 1908 with a trip to Australia and

New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...

which he visited again in 1938–1939. Aston was a skilled photographer and interested in

astronomy Astronomy () is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, g ...

. He joined several expeditions to study solar eclipses in Benkoeben in 1925, Sumatra in 1932, Magog in Canada on 31 August 1932 and Kamishari

Hokkaido, Japan is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The la ...

on June19th 1936. He also planned to attend expeditions to South Africa in 1940 and

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

in 1945 in later life. He never married. Aston died in Cambridge on 20 November, 1945 at the age of 68.

Legacy

The

lunar crater Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, all of which were formed by impacts. The International Astronomical Union currently recognizes 9,137 craters, of which 1,675 have been dated. History The wor ...

Aston was named in his honour. The British Mass Spectrometry Society awards the

Aston Medal The Aston Medal is awarded by the British Mass Spectrometry Society to individuals who have worked in the United Kingdom and have made outstanding contributions to our understanding of the biological, chemical, engineering, mathematical, medical, ...

in his honour.

References

External links

Annotated bibliography for Francis Aston from the Alsos Digital Library for Nuclear Issues
* including the Nobel Lecture, December 12, 1922 ''Mass Spectra and Isotopes''
History of Mass Spectrometry - Pioneers
{{DEFAULTSORT:Aston, Francis William 1877 births 1945 deaths English chemists Nobel laureates in Chemistry Fellows of the Royal Society Corresponding Members of the Russian Academy of Sciences (1917–1925) Corresponding Members of the USSR Academy of Sciences Mass spectrometrists Alumni of Trinity College, Cambridge Alumni of University of London Worldwide Alumni of the University of London Alumni of the University of Birmingham People from Harborne Royal Medal winners Fellows of Trinity College, Cambridge People educated at Malvern College English Nobel laureates Academics of the University of Birmingham