angle to vertical / degree signal strength / ADC channel Z1 at 90 degr. Z2 at -90 degr. WLS-liquid: LAB + 5% PMP Illumination : LED fiber, 2.7 V air gap ~1mm Possible interpretation: Flat signal part from homogeneous light distribution in cell Increasing signal in forward direction from direct coupling of light to wls-fibers ? ZOMBI-0 in air: blue LED

ZOMBI-0 in air: signal strength / ADC channel angle to vertical / degree 405 nm WLS-liquid: LAB + 5% PMP Illumination : laser 405 nm, I = 2.7 air gap ~ 2 cm Possible interpretation: Z1 at 90 degr. Z2 at -90 degr.

ZOMBI-0 in air: signal strength / ADC channel angle to vertical / degree Z1 at 90 degr. Z2 at -90 degr. WLS-liquid: LAB + 5% PMP Illumination : laser 370 nm, I = 0.0 ??? plus add. attemuation air gap ~ 2 cm Possible interpretation: 370 nm

ZOMBI-0 in air: angle to vertical / degree signal strength / ADC channel WLS-liquid: LAB + 5% PMP Illumination : flash lamp 310 nm, I = 5.5 air gap ~2 cm Possible interpretation: If flash lamp works correctly, all light comes from wave length shifting 310 nm Z1 at 90 degr. Z2 at -90 degr.

angle to vertical / degree signal strength / ADC channel ZOMBI-0 in air: PMT-Z1 at +90 degree 310 nm 370 nm 405 nm blue LED

ZOMBI-0 in air: 310 nm 370 nm 405 nm blue LED PMT-Z2 at -90 degree angle to vertical / degree signal strength / ADC channel

ZOMBI-0 in air: PMT-Z2 at -90 degree normalized signal strength / ADC channel angle to vertical / degree 310 nm 370 nm 405 nm blue LED

ZOMBI-0 in air: signal strength / ADC channel angle to vertical / degree 370 nm PMT-Z2 at -90 degree PMT-Z1 at +90 degree 370 nm measurement 1 measurement 2 Stability check 1 ?

ZOMBI-0 in air: measurement 1 measurement 2 PMT-Z2 at -90 degree PMT-Z1 at +90 degree angle to vertical / degree signal strength / ADC channel blue LED Stability check 2

PMT-Z1 at +90 degree PMT-Z2 at -90 degree angle to vertical / degree ZOMBI-0 in air and water: blue LED signal strength / ADC channel blue LED water air

angle to vertical / degree all light m. 1 all light m. 2  only fiber light only liquid light ZOMBI-0 in air: signal strength / ADC channel PMT-Z1 at +90 degree PMT-Z2 at -90 degree blue LED

signal strength / ADC channel angle to vertical / degree 310 nm all light  only fiber light only liquid light PMT-Z2 at -90 degree PMT-Z1 at +90 degree ZOMBI-0 in air:

signal strength / ADC channel blue LED  310 nm PMT-Z2 at cm PMT-Z1 at cm distance to cell center / cm

Working point for 310nm measurement: 5.5a.u. S ZOMBI-c / S barePMT  0.02 signal strength / ADC channel LED voltage / V PMT-ZOMBI-1: LED-fiber illuminates center of bare PMT Working point for all LED measurements: 2.7 V S ZOMBI-c / S barePMT  Working point for 405 nm measurement: 2.7 a.u. S ZOMBI-c / S barePMT  0.03