Time-resolved circular dichroism TRCD

The UV/vis spectroscopy [53, 62] and time-resolved Circular Dichroism (TRCD) [63] studies discovered lumi-R and meta-Ra states as the intermediate states between the Pr and Pfr forms. The experimental absorption peak maxima of lumi-R (1.80 eV) and meta-Ra (1.87 eV) states are very close to that of Pr form (1.86eV) [62]. The Cl5=Cl6 rotation is so far accepted as the primary step of the photo-isomerization... 

Fig. 16.6 Thee time-resolved circular dichroism (TRCD) of hemoglobin-CO (HbCO dashed line), hemoglobin (Hb solid line) and HbCO 10 is after laser flash photolysis (dotted line).

Circular dichroism (CD), the differential absorption of left versus right cireularly polarized light, is the polarization spectroseopy perhaps best suited to detecting the presence of asymmetry in the structure or environment of moleeular ehromophores. Various time-resolved CD (TRCD) methods have been developed to take advantage of this sensitivity and obtain more detailed structural information about kinetic processes than is found from ordinary time-resolved absorption measurements [33]. Some examples of the processes studied with TRCD methods are the effeets of electronie excitation on the structure of chiral inorganic complexes, the ehanges in a-helical secondary... 

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