Thus he is credited with the discovery of the electron and of the first subatomic particle. Like most scientists of that era, he inspired generations of later physicists, from Einstein to Hawking. Thomson gets a much better value for the velocity of cathode ray particles.ġ897 - Thomson confirms that cathode rays consist of negatively charged particles with less than ¹/₁₀₀₀ the mass of a hydrogen atom. Thomson was one of the great scientists of the 19th century his inspired and innovative cathode ray experiment greatly contributed to our understanding of the modern world. He suggests that the magnetic deflection means that cathode rays are made up of electrically charged particles.ġ876 - the German physicist Eugen Goldstein calls the radiation "cathode rays".ġ890 - Arthur Schuster calculates the e/m ratio of the cathode ray particles, but he has an incorrect value for their velocity.ġ894 - The English physicist J. This shows that the "rays" from the cathode travel in straight lines.ġ874 - the Anglo-Irish physicist George Stoney proposes the name "electrine" for the unit of charge, but in 1891 he changes the name to "electron."ġ875 - the British chemist Sir William Crookes makes the first good discharge tubes. Thomson's discovery of the electron was built on advances in technology and on the ideas and experimental results of earlier researchers.ġ830s -Faraday works with cathode ray tubes, but his vacuum pumps aren’t good enough for him to get meaningful measurements.ġ840s - the British chemist Richard Laming proposes that there are such things as subatomic particles of unit charge.ġ855 - the German inventor Heinrich Geissler develops a better vacuum pump and produces the first good discharge tubes.ġ858 - the German physicist Julius Plücker shows that the rays are deflected by a magnet.ġ869 - the German physicist Johann Wilhelm Hittorf finds that a solid body put in front of the cathode casts a shadow. J.J Thomson gets the credit for "discovering" the electron. Faraday worked with cathode rays, but there was at the time no concept of negatively charged particles.
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