1 / 5

Nuclear Magnetic Resonance

Nuclear Magnetic Resonance. ANIMATED ILLUSTRATIONS. MS Powerpoint Presentation Files. Uses Animation Schemes as available in MS XP or MS 2003 versions. A class room educational material. File-8 FT NMR-I. http://ugc-inno-nehu.com/links_from_web.html. Computer memory. Time domain. DIGITIZE.

betty_james
Download Presentation

Nuclear Magnetic Resonance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Nuclear Magnetic Resonance ANIMATED ILLUSTRATIONS MS Powerpoint Presentation Files Uses Animation Schemesas available in MS XP or MS 2003 versions A class room educational material File-8 FT NMR-I http://ugc-inno-nehu.com/links_from_web.html

  2. Computer memory Time domain DIGITIZE 15 Analogue to Digital Converter A.D.C. 11 0 Computer output FFT from FID Next Slide Frequency Domain Spectrum Computer input PULSED NMR Acquire F.I.D. Free Induction Decay NMR detection soon after a strong pulse: precessing nuclear magnetization induces a signal in coil when it is free of the perturbing EM radiation Acquisition is automatically in the digitized form F.I.D. This one-dimensional FT NMR spectrum is the same information as the C.W. NMR spectrum

  3. dimension A(50),B(50),Y(50),X(50) K=32 open (unit=1, file="output") Print 10,K DO 11 N=1,K X(N)=(N-1)*3.5/K X(N)=EXP(-1.0*X(N)) Y(N)=X(N)*(COS(2*3.14*(N-1)*10.0/K)+ 1 COS(2*3.14*(N-1)*4.0/K)) 11 write (1,20) N,Y(N) DO 12 M=1,K A(M)=0 B(M)=0 DO 13 N=1,K-1 A(M)=A(M)+Y(N)*COS(2*3.14*(M-1)*(N-1)/K) 13 B(M)=B(M)+Y(N)*SIN(2*3.14*(M-1)*(N-1)/K) A(M)=A(M)/K B(M)=B(M)/K M2=M/2 12 write (1,30) M2,A(M2),B(M2) 10 FORMAT(1x,I2) 20 FORMAT(1x,I2,2x,F10.5) 30 FORMAT(1x,I2,2x,F10.5,2x,F10.5) close (unit=1) STOP END A program in Fortran for“Fast Fourier Transform” Digitized FID Signal Digital Computer ---------------------------------------------------------------------- ---------------------- ------------ - FFT Program run OUTPUT

  4. Time domain FID data: 32 points Real Imaginary 16 data16datapoints points Frequency domainspectrum

  5. Value between +1 & 0 0 +1 F.T F.T COS Real SIN Imaginary Imaginary Real F.T Arbitrary Phase Real Imaginary t=0 Provision is made in the data processing system, for routinely applying phase corrections fc cos(2πνt) + fssin (2πνt) with fc2 +fs2 =1

More Related