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is the name given to a group of lines that are closely spaced and arranged in a regular sequence that appears to be a band. It is a colored band, separated by dark spaces on the two sides and arranged in a regular sequence. In one band, there are various sharp and wider color lines, that are closer
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The bands may overlap. In general, the energy spectrum can be given by a density function, describing the number of energy levels of the quantum system for a given interval. Spectral bands have constant density, and when the bands overlap, the corresponding densities are added.
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corresponds to the difference in two energy levels of an atom. In molecules these levels can split. When the number of atoms is large, one gets a continuum of energy levels, the so-called "spectral bands". They are often labeled in the same way as the monatomic lines.
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on one side and wider on other. The intensity in each band falls off from definite limits and indistinct on the other side. In complete band spectra, there is a number lines in a band.
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or be subdivided into many. Allocation of radio frequency ranges to different uses is a major function of radio
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This spectra is produced when the emitting substance is in the molecular state. Therefore, they are also called
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A radio communications signal must occupy a range of frequencies carrying most of its energy, called its
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More generally, spectral bands may also be means in the spectra of other types of signals, e.g.,
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Many systems are characterized by the spectral band to which they respond. For example:
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and so on, and each of these ranges can in turn be divided into smaller ranges.
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305:"Introduction to the Electromagnetic Spectrum and Spectroscopy"
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can be divided into many different ranges such as visible
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326:"An Overview of Frequency Bands and Their Applications"
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118:. It is emitted by a molecule in
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