Electronic radiation spectrum

Figure 10.1 (a) Distribution of emitted radiation from an electron travelling at relativistic speeds in a circular orbit, (b) The universal, vertically integrated, synchrotron radiation spectrum as a function of reduced wavelength. The axes are calibrated for the SRS at Daresbury Laboratory... 

Keene JP (1964) The absorption spectrum and some reaction constants of the hydrated electron. Radiat Res 22 1-13... 

By tuning the potential difference, the device can emit a certain radiation spectrum by varying the incident radiation, the device can generate various electrical currents. In this instance, it is important to concentrate on the electron flux N, just as we did on the heat flux Q in photothermal energy... 

Schnepp and Dressier98 photolyzed ammonia in an argon matrix at 4.2°K. They observed the electronic absorption spectrum of NH and NH2. It was concluded that NH was produced only with light of wavelength below 1550 A., whereas NH2 was produced with radiation both below and above 1550 A. 

Light (or near-ir and uv radiation) that is incident on opaque minerals is partly absorbed and partly reflected by them. There are two kinds of reflection processes that occurring when light is reflected from a flat polished surface of the mineral (specular reflectance) and that occurring when the light is reflected from the mineral after it has been finely powdered (diffuse reflectance). The latter arises from radiation that has penetrated the crystals (as in an electronic absorption spectrum) and reappeared at the surface after multiple scatterings in this case there will also be a specular component to the reflectance from light that is reflected from the surfaces of the particles. The specular reflectance of a flat polished surface of an opaque mineral measured at normal incidence can be related to the n and k terms of the complex refractive index (N) in which ... 

Keene, J. P. The Absorption Spectrum and Some Reactions Constants of the Hydrated Electron. Radiation Res. 22, 1 (1964). 

Figure 4b shows the XPS spectrum of the electron beam irradiated SWNTs. The radiation dose for this sample was 60 kGy. As shown in the figure, the small peak (3 in Figure 4a) near 284 eV has essentially disappeared, indicative of the removal of carbon impurities. The peak from oxidized carbon derivatives (2), which may include oxygen containing carbons, remained broad, so a proper deconvolution process could not be performed here. However, the relative concentration of peak 2, obtained from the peak area, decreased upon electron radiation, implying that any significant oxidation did not occur while the carbon impurities were selectively removed by electron radiation. Overall, the spectrum... 

Electrons are very energetic species. They are from the short wave length, high energy end of the electromagnetic radiation spectrum, as can be seen from Table 1. 

Visible and UV light sources, which excite electronic transitions, can be used also for PD spectroscopy. By scanning the frequencies of the radiation emitted from the UV/vis light source and measuring PD or electron photodetachment as a function of excitation wavelength, an electronic action spectrum can be constructed in the same way as a vibrational action spectrum is constructed using an IR source. 

Fig. 3 gives the radiation spectrum of an electron moving in a curved trajectory, per GeV. This is expressed in terms of the photon flux, which is of practical interest, as a function of the radiation wavelength divided by the critical wavelength. Its peak occurs at / q 4. Although the flux falls off rapidly below 4 X, it is still of useful intensity down to 0.1 X. ... 

Fig. 3. Normalized radiation spectrum of an electron moving in a curved trajectory, per GeV. X = critical wavelength.

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