14 - COSY 1 - Polarization transfer In these experiments,...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Polarization transfer In these experiments, we are trying to transfer magnetization from our sensitive, high γ , spins ( 1 H) to our insensitive, low γ , spins ( 13 C). Later, we will use this “polarization transfer” to correlate the 1 H spins with their 13 C partners Spin populations in this system before a selective inversion By inverting the H1 transition, we have altered the 13 C population difference: C1, it was 2 C and now it is -2 H + 2 C and C2 is now 2 H + 2 C. Recall that 2 H is 4 times greater than 2 C. Therefore, our enhancements are (-8+2=-6) and (8+2=10) or -3:5.
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 The limitation of this experiment is that it is not general and it is desirable to perform a polarization transfer on all resonances at the same time. INEPT and DEPT are capable of this all at once transfer. INEPT: Insensitive Nuclei Enhanced by Polarization Transfer DEPT: Distortionless Enhancement by Polarization Transfer INEPT type pulse sequences:
Background image of page 2
3 A population inversion on
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/08/2009 for the course CHEM 439 taught by Professor Falzone,c during the Spring '08 term at Penn State.

Page1 / 13

14 - COSY 1 - Polarization transfer In these experiments,...

This preview shows document pages 1 - 4. Sign up to view the full document.

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