Gauss pulse

A Gauss pulse and a polynomial multiplied by a Gauss pulse satisfy the requirements of rapid fall-off in both the time and the frequency domains. A pulse the shape of which is determined by a product of a Hermitian polynomial and a Gauss function is a Hermite pulse [Sill, War2]. Its width can be more narrow than that of a Gauss pulse. A fairly uniform rotation of z magnetization can be generated if the sum of a zeroth- and a... 

Fig. 9. Pulse sequences for 3D- and 2D- H, X, Y correlations. The same notation as in Fig. 1 is used, (a) HNCA-analogue 3D experiment. (b) HNCO-analogue 3D experiment. (c) gs-SELTRIP with a selective 180° gauss pulse the gradient strength (for the case H. C. P) is +/-2S, —/+25,22.7 for echo/antiecho selection. ...

Calculate Angle (Radians) = [beta/[2 hbar]] g Attenuation (Bl, Gauss) pulse length (ns)... 

The const value depends on the shape of the pulse envelope. For the Gauss pulse const = 0.44. The pulse with a duration of 10 s has a spectral width of 1100 cm. This implies that the femtosecond light pulse can simultaneously excite several vibrational states. 

Tesla 1 T = lO gauss Pulse width (length, duration)... 

Figure 2. Spin-echo -NMR spectra from a diffusion experiment with a cubic phase of dDAVP (10%), MO (60%) and 2H20 (40%). Temperature 40 C, t=20 ms, A=24 ms, g=l 19 gauss/cm and 8=1.0,2.0..., 9.0 ms. The inset shows the aromatic region originating from dDAV P at a higher amplification. Also shown is the pulse sequence used in the NMR-diffusion method (see text for details).

Fig. 18. The pulse sequence of a ID ge-NOESY-TOCSY experiment, tnoe is the NOE mixing time, 5 are optional delays which can be used for z-filtration [81] or for suppression of ROE effects in macromolecules (2 x (5 + Tgrad) = 0.5 x mixing time). DIPSI-2 [78] sequence was used for isotropic mixing. Phases were cycled as follows 0i = 2x, 2(—x) (j)2 = X, —x Ip = X, 2 —x), X. Rectangular PFGs, G = 6 Gauss/cm and Gi = 7 Gauss/cm, were applied along the axis for Xpad = 1 ms.

Loading the file ch4321.cfg set the Calculation mode to Shaped pulse in the Calculate I Setup dialog box and in the SPNAMO filename box enter the filename. .. wave gauss.shp. Close the dialog box OK. In the Calculate I Time... 

Clearly this will produce magnetization components which do not focus properly in the x-y plane. In order to avoid these problems, the condition H >G 2R should be met. Typically, this will limit continuous gradient diffusion measurements to G of 30 gauss/cm or less. One can do an approximate evaluation of G from the echo duration and of from the duration t of a 71/2 pulse, where yHjX=n/2, to check the above condition. The pulsed gradient method described in the... 

Several laboratories are experimenting with pulsed magnetic fields of sufficient strength (10 —10 gauss) to provide useful track curvature measurements in emulsions. 

The basic feature of time domain spectroscopy (TDS) is the application of a broad bandwidth signal containing all the frequencies togeflier. A typical signal with broad bandwidth is the square wave (Teorell, 1946). Other popular signals are the Dirac pulse, the multisinusoidal excitation, and the Gauss burst or wavelets. 

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