C613_lecture2_overheads_010908

C613_lecture2_overheads_010908 - 1897 J.J Thomson Awarded...

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Unformatted text preview: 1897 - J.J. Thomson Awarded the Nobel prize in physics in 1906 “In recognition of the great merits of his theoretical and experimental investigations on the conduction of electricity by gases” • Electrons as “cathode rays”, fundamental particle • Determined m/e for an electron • First mass spectrometer (w/ Aston) 1.http://nobelprize.org/nobel_prizes/physics/laureates/1906/ Thomson J.J. , Phil. Mag. , 1897 , 44, p.293 C = cathode A = anode S = grounded slit D,E = aluminum plates (?V) Phosphor plate 1911 - J.J. Thomson Rays of positive electricity • Focusing of ions of discrete q/m values • Parabolic path for unique m/z • Path length defined by initial velocities of ions Thomson J.J. , Phil. Mag. Series 6 , 1910 , 20, 118, 752 Thomson J.J. , Proc. of the Royal Society , 1913, A 89,607,1-20 Phosphor plate C = cathode P = Lenses (?V) M =Magnet S = phosphor plate 1919 – Francis W. Aston Awarded the Nobel prize in chemistry in 1922 “"For his discovery, by means of his mass spectrograph,...
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C613_lecture2_overheads_010908 - 1897 J.J Thomson Awarded...

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