AQ Na data points per FID with increasing ta values t1=0, then tI=DW, t=2DW,. t=AQI(TDI different ti values). Our complete data set now consists of TDI FIDs(with TD2 data points each)
We can now perform a"normal"FT along t2, converting the series of FIDs into a series of spectra which are all identical (with a signal at S2), except for a modulation with sin(_2t1) along the tI dimension: ■■口■■■■口■■■■■■■■■■■■■■■■■■■■■■■口■■■■■■■■■■■■口■■■■■口■■1 N2 data poInts per spectrum
If we now read out single columns from our 2D data matrix, then we will generally get a pseudo-FID From these pseudo- FIDs we can again generate a frequency spectrum by FT(now along the tr dimension), and will get a signal at the frequency Q2 in this fl dimension - in the column at Q2 in F2: E8n N2 data polnts per spectrum
E9影65 frequency ads F2 (from t2-FT
核磁共振基本原理10讲 吴季辉 (c)时域数据集 S0,0),S(0,△t)S(0,2 S0,kx2△t) (t1, S△t1,△t),S(t1,2△t2) S(△t;,k2△t) SQ△t1,0),S(2Δt1,△t)S(2△t1,2△t2)……S(2△t,k2△t) Sdx1△t,0),S(k1△t,t2),S(k1Δt,2△t)……S(k1△t,k△t2) (d)频域数据集S(Go1,∞2) S0,0),S(0,△∞2),S(0,2△∞2) S(①0,kx△2) S△1,O),S(△∞1,△2),S( 2△ S(△∞1,k2△2) SQ△∞1,0),S(2△∞,△∞2),S(2△∞1,2△∞2)……S(2△∞1,kx△2) S(k1△∞1,0)S(k1△∞1,△∞2),S(k1 2△ S(k1△1,kx2△2 图9.1-22D-NMR实验及数据集
核磁共振基本原理 10讲 吴季辉