I am designing a simple Mass Spectrometer.
I need to find radius of $Pb_{204}^{-}$ when deflecting. I have this equation:
I know everything in that equation except the mass. I have
How can I find the mass for the equation?
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1$\begingroup$ It is shown in the last column "Isotope mass" wwwndc.jaea.go.jp/cgi-bin/nuclinfo2014?82%2C204 $\endgroup$ – lurscher Jun 11 '20 at 15:59
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The mass of a neutral $Pb_{204}$ atom is given right in your green image.
Because you have a negative $Pb_{204}^-$ ion, you need to add the mass of one electron.
answered Jun 11 '20 at 16:05
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$\begingroup$ @jmh I don't see how the radius of the nucleus is relevant here. The radius $R$ in the asked question is the radius of the curved ion beam when flying through the magnetic field in the mass spectrometer, typically a few inches. $\endgroup$ – Thomas Fritsch Jun 11 '20 at 17:39
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