Pump, diffusion magnetic

Figure 8.2. Simplified block diagram of the apparatus used to study the magnetic resonance spectrum of H2. The molecular beam source was cooled to liquid nitrogen temperature. M denotes fractionating pumps, whilst S and F are diffusion pumps. The appropriate molecular trajectories are not shown in this diagram the reader is referred back to figure 8.1.

Solvents and eluents must not be stored in plastic bottles because plasticizers and other low-molecular compounds may diffuse into the liquid. Eluent reservoirs should always be capped, either gas-tight or not depending on whether the solvents are stored or in use. Figure 4.1 shows a solvent supply vessel with aU possible accessories heating (for thermostating), reflux condenser, magnetic stirrer, vacuum pump, inert gas line and excess temperature control. 

MHD-based models have been widely used in various magnetically assisted electrolyte flow investigations. 74,75 application of the pumping effect of combined electric and magnetic fields led to the development of MHD-pump electrode cells, where the concentration distribution, modeled by the classical convective diffusion equation... 

This reaction is conducted in a 250-ml. two-neck flask provided with a reflux condenser and a magnetic stirrer. The other neck of the flask is closed with a rubber cap. The reflux condenser is connected to a receiver and a diffusion pump via cold traps, where the entrained liquid is condensed. Gas inlet lines with stopcocks allow each part of the apparatus to be evacuated separately or, if desired, to be filled with air or N 3. 

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