Long wavelength region

A>574 nm) or thermally at temperatures up to 35 K. The presence in the electronic spectrum of [71] of an absorption maximum in the long-wavelength region at 530 nm suggests a planar structure for this compound, which agrees well with esr data. 

The results indicate that in the long-wavelength region (e.g., A 600nm), the photosensitivity for the a-Sbj Sei j films is higher than for the pure selenium, probably due to a greater quantum efficiency. 

Separation of bulk and surface properties in macroscopic semiconductors is less than straight forward and requires highly sensitive experimental techniques. In contrast, the large surface-to-volume ratios in nanosized semiconductor particles render the examination of surface processes in and/or on these colloids to be experimentally feasible. Advantage has been taken of pulse radiolysis to inject electrons (in aqueous, N20-saturated solutions which contained 2-propanol see Eqs. 22,23, and 25) or holes (in aqueous, N20-saturated solutions which did not contain 2-propanol see Eqs. 22 and 23) into nanosized semiconductor particles [601, 602], Electron injection into CdS particles, for example, decreased the extinction coefficient at 470 nm (the absorption onset) by — 5 x 104 M-1cm-1 (Fig. 98) [576]. Hole injection resulted in the appearance of a transient absorption band in the long-wavelength region and in much less... 

With the exception of some fluoromethanes, absorption of light in the long wavelength region appears to result almost exclusively in dissociation at the weakest C-X bond. The primary products are thus an alkyl (or haloalkyl) radical and a halogen atom. 

Radiation spectrum lines, which cannot be explained by the model of one vacancy, historically were also called satellite lines. There are cases, particularly in the long-wavelengths region, when the intensities of satellite lines become comparable to those of diagram lines, or even exceed them. Then the division of X-ray radiation into diagram and satellite lines becomes senseless. 

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