Cryostatic flow reactor

The temperature of the reactor content (Tj.) is controlled by varying the power of a compensation heater inserted directly into the reactor content. As with an electrical heater, cooling is not possible, so the compensation heater always maintains a constant temperature difference between the reactor jacket and the reactor content. Thus cooling is achieved by reducing the power of the compensation heater. The heat-flow rate from the reactor content through the wall into the cooling liquid ( Fiow) is typically not determined because the heat-flow rate of the reaction is directly visible in the power consumption of the compensation heater. The temperature of the cooling liquid (Tj) is maintained at a constant temperature by an external cryostat. The power-compensation principle was first implemented by Andersen and... 

PI) Pressure indication device (PIC) automatic pressure control (TI) temperature indicating device (TIC) automatic temperature control (FI) flow-meter (LC) level indicator (R) reactor (M) motor (WT) heat exchanger (ZR) bucket wheel lock (KM) membrane compressor (KR) cryostat (K) cooler (S) screw feeder (G) container (F) flare (TG) dip pipe (Z) cyclone (P) pump (EF) electric separator (DK) packed distillation column... 

The samples were grown by MBE at 700 C (for details see [4]). The samples had 10 layers containing quantum dots. For the irradiation with 2.4 MeV protons at RT, a Van de Graaff accelerator was used. The passivation with atomic hydrogen at 250"C for 30 min was undertaken in a CVD reactor. The PL measurements were performed at a Bruker IFS 66v FTIR spectrometer equipped with a Ge detector. The samples were placed in a helium gas flow cryostat at temperatures from 5-300K. For the excitation in a wide power range we used the 488 nm line of an Ar laser. 

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