ps 4 solution - Chemistry420 Problemset#4(80pointstotal)Key

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Chemistry 420 Problem set #4 (80 points total) – Key Due at the beginning of class November 5 No late assignments will be accepted. Assignments are due at beginning of class—starts at 12 Noon! For full credit assignments must be in box when the lecture begins. Any assignment turned in between noon and 12:05 PM will automatically be deducted 5 points. Assignments will NOT be accepted for credit after 12:05 PM. Score = 0 No name, no grade. Show all of your work for each answer. Partial credit will be given and NO credit will be awarded if no work is shown. Be careful to use correct significant figures. 1. (10 points) How do quadrupole mass analyzers perform mass selection? Key points to be discussed : 4 parallel, cylindrical rods (2 points) Opposite rods connected and have same DC voltage applied (2 points) AC voltage applied to each pair of rods (2 points) AC and DC voltages are tuned simultaneously (1 point) Voltage control makes it so only one m/z has the proper trajectory to make it through the quadrupole (3 points) 2. (5 points) Briefly describe how time of flight mass analyzers function? Key points to be discussed : Pulse of ions (2 points) Ion pulse is accelerated into drift tube via an accelerating voltage (1 point) Drift tube is field free (1 point)
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ps 4 solution - Chemistry420 Problemset#4(80pointstotal)Key

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