Sharp spectrum

The strongest, most easily discerned set of lines were called the principal spectrum. After the principal spectrum, there are two series of lines, the sharp spectrum and the diffuse spectrum. In addition, there was a fourth series of lines, the Bergmann or fimdamental spectrum. 

Irradiated 2-methyltetrahydrofuran glass gives an ESR signal as shown in Fig. 4, which is composed of a central sharp spectrum and a broad seven-line spectrum. The former has the width of 4.5 G and is bleached out by visible lights. This spectrum is due to the trapped electrons in the glass. 

Figure 2 shows 1 3C NMR spectra of curdlan(DPn 540) of an water suspension and alkaline solution reported by Saito et al. 8). It is noteworthy that at a concentration of 0.22M NaOH the broad 1 3C NMR signals decrease to less than one-tenth of those of the aqueous suspension. This sharp spectrum is characteristic of random-coil conformation. This is consistent with the results of Ogawa et They determined the dependence of optical... 

As the first step of spin manipulation, Okazaki and Toriyama [16] studied the microwave power dependence of the RYDESR spectra for the photoreduction of anthraquinone in SDS and perdeuteriated SDS micellar solutions. Their observed spectra are shown in Fig. 14-5, together with the simulated spectra under various powers. Fig. 14-5(A) shows the RYDESR spectra in an SDS solution at the microwave power of 4.0 and 1000 W. A relatively sharp spectrum was observed at 4.0 W, where the HF structure should remain from the simulated spectrum. The spectrum obtained at the microwave power of 1.0 kW is broadened over the range of 40 mT, showing a minute structure at the center. Fig. 14-5(B) shows the RYDESR spectra in a perdeuteriated SDS micellar solution at the microwave power of 16 and 1000 W. 

In order to increase the transparency of silicic acid powder Robin and Trueblood suspended it as a slurry in cyclohexane, possessing approximately the same refractive index and thus obtained absorption spectra of adsorbed benzene and its derivatives (46). However, the adsorption from even dilute solutions produced poorly resolved broad bands, contrasting with the sharp spectrum of the cyclohexane solution itself with the same total number of dissolved molecules. J In comparison with the cyclohexane solution, the maxima of the broad absorption bands of adsorbed benzene and its derivatives are seen to be shifted to the higher frequencies. However, relative to the gaseous state, the shift is to the red by < 130 cm . ... 

It is important to appreciate that an electron oscillating in a sphere of positive electrification will execute a simple harmonic motion and emit radiation of definite frequency, giving a sharp spectrum line. Thomson investigated mathematically the stable distribution of electrons in rings in his atom model, and found that the results agreed with some experiments on floating magnets made by A. M. Mayer, which Thomson used to show in his lectures at the Royal Institution. 

The 3-CD complex which shows the sharp spectrum probably takes the axial structure [2,8] similar to that of the 3-CD-AQ-2S complex in Fig. 

The sharp spectrum is probably that of the complex in the crystal-dine state in view of its sharpness and the concentration dependence of its relative intensity. The y-CD complex which shows the longer wavelength spectrum is probably the 1 2 complex [10] in which the orientation of the quinone molecule is axial, in consideration of the dimensions of AQ-2S and NQ in Fig. 1. On the other hand, the y-CD complex which shows the shorter wavelength spectrum is tentatively assigned to the 1 1 complex in which the orientation of the quinone molecule is equatorial [8], and consequently in which the quinone may form the hydrogen-bond with the solvent. 

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