Mass-to-charge ratio refers to the molecular or atomic mass number and "z" to the charge number of the ion; however, the quantity of "m"/"z" is dimensionless by definition. An ion of 100 atomic mass units ("m" = 100) carrying two charges ("z" = 2) will be observed at "m"/"z" = 50. In the 19th century, the mass-to-charge ratios of some ions were measured by electrochemical methods. In 1897, the mass-to-charge ratio of the electron was first measured by J. J. Thomson. By doing this, he showed that the electron was in fact a particle with a mass and a charge, and that
Imogen (given name) Imogen (given name) Imogen , or Imogene, is an English-language female given name of uncertain etymology. Because the first recorded use of the name is by the English playwright William Shakespeare, it is popularly believed that he invented the name. It is chiefly used as a given name in the United Kingdom, Ireland, Canada, Australia, New Zealand, South Africa, Germany, Austria, the Netherlands, Belgium, Switzerland, and Scandinavian countries. The first recorded use of the name Imogen is by Shakespeare for a British princess in his play "Cymbeline". It is possible that the name may have originated as an accidental or