Difference Frequency Generation of 5-18 mum in a AgGaSe(2) Crystal.

Mid-infrared radiation in the 5-18-mum range has been obtained by difference frequency generation in a AgGaSe(2) crystal by pumping with the output of a type I LiNbO(3) optical parametric oscillator (OPO). Here we suggest the use of a LiTaO(3) retarder to achieve an orthogonal state of polarization between OPO outputs that are necessary for efficient pumping of a AgGaSe(2) crystal. Several tens of kilowatts of peak power near 8 mum and continuously tunable operation in the above range have been obtained.

Generation of electronically excited species during enzymatic oxidation of chlorpromazine and related compound.

Chemiluminescence in visible region was detected, during peroxidase-catalyzed oxidation of chlorpromazine at pH7.5 (but not at pH4.25) or of propericiazine, both at pH7.

Chemiluminescence in L-tyrosine-H2O2-horseradish peroxidase system: possible formation of tyrosine cation radical.

Tyrosine-H2O2-horseradish peroxidase system at pH 7.4 emitted light in visible region. Phenolic compounds other than tyrosine were also emissive, whereas methoxy phenylalanine and phenyl compounds were not, in H2O2-peroxidase systems.

Studies on the tryptophan-dependent light emission by prostaglandin hydroperoxidase reaction.

The chemiluminescence earlier observed upon the incubation of arachidonic acid with prostaglandin-synthesizing microsomes of sheep vesicular gland (Marnett et al. (1974) Biochem. Biophys.