1. Mass Spectrograph Physics Chapter 27 B

2. Mass spectrograph Adapted CRT/Thomson tube used to form and accelerate charged particles and measure their deflection Electric field accelerates charged particles Magnetic field deflects charged particles Ratio of mass to charge found for particles

3. Equations

4. Mass spectrograph As V changed, more electrons removed As B changed, deflection of charged particles changes Different mass particles deflected different amounts, and can be identified Mass Spectrometry MS - YouTube

5. Example A beam of doubly ionized Ne atoms produced. V = 34 V, B = 0.50 T, and r = 0.053 m. Charge =2(1.60 x 10 -19 C). Calculate the mass of Ne. Equation: ◦ m = qB 2 r 2 /2V

6. Example continued How many proton masses are in the neon atom mass? Proton mass is 1.67 x 10 -27 kg.