MSE2020LectureNotes_2_10

MSE2020LectureNotes_2_10 - MSE 2020 Page 1 of 5 Presentat...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: MSE 2020 2/10/2011 Page 1 of 5 Presentat ion: M ass Spectromet ry • J.J. Thompson – father of mass spectrometry o Deflected deionized neon/electrons with magnetic/electric fields • Measures the mass/charge ratio • Amount of deflection is measured o Depends on the mass of the particle • Sample prep o Doesn’t have to be a pure sample but must be in the gaseous state (vaporization may be a step) and ionizable o Ionization Sample made into a gas Positively ionize the sample by knocking off electrons with high energy beam (fragmentation of sample/molecules occurs) o Acceleration Give all molecules the same kinetic energy Sample is pushed through a chamber with 3 slits (each with a different potential so as to accelerate the charge ions) All ions from the sample are made into a beam/stream o Reflection Field (magnetic or electric) is applied Lighter ions are deflected more than heavier ones Positive ions are deflected in the opposite direction as negative ions o Detection Ions collide with a metal plate MSE 2020 2/10/2011 Page 2 of 5 Collision energy is transferred into electrons, emitted ions/photons This energy transfer creates a signal that is picked up by the detector • Data Analysis o Can’t assume that the charge is +1 If it’s not +1, there will be a matching line at half the mass/charge (if...
View Full Document

{[ snackBarMessage ]}

Page1 / 5

MSE2020LectureNotes_2_10 - MSE 2020 Page 1 of 5 Presentat...

This preview shows document pages 1 - 3. Sign up to view the full document.

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