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1 E layer: The next layer beyond the D layer is called the E layer. 2  This exists at an altitude of between 100 and 125 km. 3  Instead of acting chiefly as an attenuator, this layer reflects radio signals although they still undergo some attenuation.
In this type of spectroscopy, each optical wavelength that is recorded is encoded with an audio frequency containing the original wavelength information. A wavelength analyzer can then reconstruct the original spectrum.amma radiation is the energy source in this type of spectroscopy, which includes activation analysis and Mossbauer spectroscopy. Infrared Spectroscopy. The infrared absorption spectrum of a substance is sometimes called its molecular fingerprint.