Factors affecting the formation of the radiation pre-peak at the operation of a Grimm-type source in pulsed DC mode.The plasma emission pre-peaks of many atomic and ionic spectral lines of Cu and Ar were systematically investigated in a Grimm-type pulsed glow discharge (PGD). 
Grimm-type source
To register the pre-peaks with sufficient time resolution, a monochromator with photomultiplier detection was used. 
monochromator with photomultiplier detection