Page 151 - Photoreactive Organic Thin Films

130 ZOUHEIR SEKKAT AND WOLFGANG KNOLL

1.2
PUR-1
1 1.6; (0.329)
2 12.8; (0.394)
1.1 - •3 64; (0.333)

u
§ 1-0
•e
o
j§

0.6
15
Time t/minutes
FIG. 4. 1 8 Photo-orientation dynamics of PUR- 1 . Absorbance, normalized by the absorbance value
before irradiation. The irradiation light is turned on and off at 5 and 10 minutes. The numbers 1-3
2
indicate and increasing irradiation intensity the value of which is given in units of mW/cm with the
corresponding sample's absorbance prior to irradiation in units of OD (value between brackets). The
inset shows and expanded view of the first few seconds of photo-orientation.

1.0

0.9

0.8

o
2 PUR-3
0.7 1 1.6; (0.310)
2- 12.8; (0.269)
3— 76.8; (0.294)
24seconds
0.6
0 5 10 15
Time t/minutes
4.19 Photo-orientation dynamics of PUR-3.The samples' OD prior to irradiation was - 0.3.