Electromagnetic radiation polychromatic

On the other hand, medium-pressure (MP) Hg lamps can be operated with much higher electrical input power up to 30 kW, but with a reduced UV radiant power efficiency of 30 to 40%. Their dimensions are more compact than the dimensions of the LP Hg lamps, but their polychromatic emission ranges from the UV (UV-C - 15-23%, UV-B - 6-7 %, UV-A - 8%) over the VIS (-15%) to the IR (-47-55%) region of the electromagnetic spectrum (e.g. McClean, 2001). Lam-brecht (1999) reported the power balance of electromagnetic radiation of an industrially used high-pressure mercury lamp with a power density of 200 W cm as follows 13.2% UV-C, 7.15% UV-B, 7.15% UV-A, 21% VIS, and 14% IR... 

In forward optic spectrophotometers, electromagnetic radiation of a specified wavelength is passed through sample solutions. Because radiation from source is polychromatic (consists of light of all wavelengths), the various wavelengths of radiation must be separated... 

Polarography Voltammetry with a dropping mercury electrode. Polychromatic radiation Electromagnetic radiation consisting... 

At higher particle diameters, the scattered light remains polychromatic. It is named after John Tyndall (1820-93). See also scattering OF electromagnetic radiation. 

The properties of monochromatic radiation are termed spectral, and of polychromatic radiation total (Sandu, 1986). Hydrogen has relatively simple spectra, as the hydrogen atom consists of an electron and a proton. The electron has only 0.0005 the mass of the proton, and is able to inhabit only certain levels around the proton. To move from one level to another, the electron needs to gain or lose an amount of energy, called a quantum. For radio waves, a quantum is about 0.000 004 eV, for IR a quantum is about 0.004 eV, and for X-rays and y-rays it is about 40 000 eV. Electromagnetic radiation can be considered as stream of photons, which are massless particles traveling in a wave-like pattern. Movement between the lowest levels produces a photon of far-ultraviolet radiation, movement between the next lowest levels produces visible light and near-ultraviolet radiation, whilst movement between the middle levels produces IR radiation. 

A general pulse of coherent polychromatic electromagnetic radiation can be described as superposition of monochromatic plane waves. The vector potential and fields of such a pulse are then given as... 

In the presence of a pulse of coherent polychromatic electromagnetic radiation and making the dipole approximation we can generalize the expansion in Eq. (4.44) for a component of the now time-dependent electric dipole moment to (Buckingham, 1967)... 

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