Francis Aston

Francis Aston（Francis William Aston ,18779 month 1 day - 1945 year11 month 20 day) England physicist. In 1922 depending on invention of mass spectrograph Nobel chemical prize.

It was born in the son of the wealthy merchant of Birmingham. In 1903The Birmingham universitySo to learn, the glow discharge is dark (presently it is called the Aston dark space) you found. In 1909 キャヴェンディッシュ laboratory Joseph John Thomson. With the cathode ray tube which provides the hole which can pass the cation in the electrode of cathode side, the phenomenon where vicinity of the cathode shines (the canal ray) with experiment, you verified that the canal ray is the cation of the element. When the magnetic field is given to the canal ray, because the extent which is deflected changes depending upon the mass of the ion namely the atom, it was possible to improve rapidly furthermore by combining the photographic dry plate, the atomic quantity in comparison with method to that. Furthermore neon neon two masses ( atomic quantity) It has isotope was shown. As for proof of existence of the isotope you say that ratio of the atomic quantity of each element reaches integer two times the hydrogen atoms,Hypothesis of プラウトIt came to the point of explaining the reason which is not formed with chlorine and the like.

When designating 1/16 of mass of oxygen as standard, mass of each element showed the value which is close to quite integer. Consists of just 1 proton just the hydrogen which, 0.It came to the point of keeping being related to the theory that 8% showing big value, mass is converted to the binding energy of the atomic nucleus.