April15_2005_2pp

April15_2005_2pp - April 15, 2005 Website updates! Prob Set...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 April 15, 2005 ¾ Website updates! 9 Prob Set Solutions 9 Exam #3 Info Page ¾ Review Session: Monday, 5 pm, B203 ¾ Exam #3: Wednesday, 7 pm, B104 ¾ Office Hours: Cancelled for today / 2 Quadrupole Mass Analyzers ± Based on path stability of ions in an oscillating electric field:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3 How do they work? DC Potential: -affects ALL ions (indep of mass) AC Potential: -affects LIGHT ions 4 First BiPole Pair: Pos. DC •+ DC potential repels ALL ions •AC (rf) potential attracts light ions High Mass Pass Filter
Background image of page 2
5 SecondBiPole Pair: Neg. DC •- DC potential attracts ALL ions •AC (rf) potential repels light ions Low Mass Pass Filter 6 Putting it all together Combo of the two filters results in transmission of only a narrow range of masses: Variable mass filter •Mass and mass range vary with ac and dc potentials
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Scanning a Quad Resolution: -controlled by ac/dc (max res. at ~6) 8 Properties of Quad Analyzers ¾ Resolution: up to ~1500 ¾ Fast! can obtain spectrum in
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

April15_2005_2pp - April 15, 2005 Website updates! Prob Set...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online