Set up and technology

 

1. Lamp           arc-based with Hg und Xe, Laser

2. Detector     - Vacuum photocell      

                                              dark current :10⁵ photons/s

                                              quantum yield :      0.15

                       - Si - photodiodes

                                              dark current:          10⁷ photons/s

                                              quantum yield:       0.9

 

S/N = prop. quantum yield²