The excited state dynamics in polycrystalline thin films of tetracene are studied using both picosecond fluorescence and femtosecond transient absorption. The solid-state results are compared with those obtained for monomeric tetracene in dilute solution. The room temperature solid-state fluorescence decays are consistent with earlier models that take into account exciton-exciton annihilation a...

In order to study the kinetic behavior of ligand binding, flash photolysis is widely used with various hemoproteins [l-4]. The applicability of this method, however, seems to be limited to the ferrous ligated complexes, such as CO, O2 and NO complexes, since it has been believed that only those ferrous complexes are photodissociable. To extend this technique to the ferric state, we have examine...

Herein, we incorporate photosensitive ortho-Nitrobenzyl units into polyurethanes to achieve controllable photodegradability. We performed their photolysis in solution and thin films which can inform the design of degradable adhesives.

[1] A new approach defined here allows for the averaging of photochemistry over complex cloud fields within a grid square and can be readily implemented in current global models. As diagnosed from observations or meteorological models, fractional cloud cover with many overlying cloud layers can generate hundreds to thousands of different cloud profiles per grid square. We define a quadrature-ba...