Electromagnetic spectrum fig

We use the word Tight to mean any radiation which is part of the electromagnetic spectrum (Fig. 20.1), although only a small wavelength region of the spectrum (roughly between 400 and 700 nm) is visible to the human eye. 

Infirared (IR) spectroscopy is true spectroscopy—it informs us about the electromagnetic radiation absorbed by a molecule. In Chapter 12, we discussed UV/vis spectroscopy, and IR spectroscopy is qualitatively similar. A schematic picture of the electromagnetic spectrum (Fig. 15.16) identifies the regions used for UV/vis, IR, and the spectroscopy we will study in the second half of this chapter, nuclear magnetic resonance. 

The properties of the interstellar medium have been deduced from analysis of extensive observations covering most of the electromagnetic spectrum (Fig. 2.8). Except for the analysis of pre-solar grain inclusions in meteorites, no in-situ measurement is possible because of the large distance of the objects. In the following, we describe the main observation methods and the information carried out by photons across the electromagnetic spectrum. 

All of the energy that drives the atmosphere is derived from a minor star in the universe—our sun. The planet that we inhabit, earth, is 150 million km from the sun. The energy received from the sun is radiant energy—electromagnetic radiation. The electromagnetic spectrum is shown in Fig. 17-1. Although this energy is, in part, furnished to the atmosphere, it is primarily received at the earth s surface and redistributed by several... 

Fig. 17-1. Electromagnetic spectrum. Note the regions of solar and earth radiation...

The Electromagnetic Spectrum. The optical properties of a material are related to the electromagnetic spectrum (see Ch. 15, Fig. 15.1). The portions of the spectrum of interest are the following ... 

In the electromagnetic spectrum, microwave radiation occurs in an area of transition between infrared radiation and radiofrequency waves, as shown in Fig. 1.1. The wavelengths are between 1 cm and 1 m and frequencies between 30 GHz and 300 MHz. 

Fig. 1 A portion of the electromagnetic spectrum comparing infrared energy with other forms of radiation.

Material response in THz frequency region, which corresponds to far- and mid-infrared electromagnetic spectrum, carries important information for the understanding of both electronic and phononic properties of condensed matter. Time-resolved THz spectroscopy has been applied extensively to investigate the sub-picosecond electron-hole dynamics and the coherent lattice dynamics simultaneously. In a typical experimental setup shown in Fig. 3.5, an... 

The electromagnetic spectrum can be divided into distinct ranges from low-energy long-wave radiation to high-energy short-wave X rays and beyond (Fig. 3). From a spectroscopic point of view, the basis of these different ranges is the nature or type... 

For convenience, the electromagnetic spectrum is divided into several regions, according to the frequency involved see Fig. 3.2. Of course, there is no sharp division between adjacent regions. 

Fig. 3.2 The electromagnetic spectrum. The scale is logarithmic. 1 hertz (Hz)= 1 cycle/sec.

Fig. 1.8 The electromagnetic spectrum, showing the wavelengths and frequencies of different types of radiation. Note the logarithmic scales, with each division representing a factor of ten different from the next one. The spectrum extends Indefinitely in either direction. Except for visible light (determined by the sensitivity of the human eye)the bowdaries between different types of radiation are not precise.

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