Question

Keep at least 4 digits in your calculations in this problem. In my lab I sometimes use a massspectrometer to look for contamination in my Ultra High Vacuum (UHV) Chamber and to test for leaks. The contaminants are usually water (HO, H,0) and oil from the pumps (COCO). Leaks can be detected by using helium (He) as a test gas. These compounds are ionized and then accelerated through a potential difference, Table 1. Masses of atoms where 10-166x1027 kg |Н He Jo |1.008u 4.003u 12.0114 16u IC a) If the potential difference is 4.3 kev, what are the speeds of Cy' and Coons? b) What is the difference in diameters of the paths these ions take in the presence of a 0.98 T magnetic field? C) If you wanted to separate these ions more by increasing the diameter of their paths in the magnetic field, would it be better to increase the accelerating voltage or decrease the magnetic field? Why?

Answer 1

6 Griven magnetic field, B= 0.98T Now ou mv² QUB R=mv qB R=& Dallameter path of circular > R= mv 2 qB => D=2my qB