Used attributively or in the possessive to designate certain phenomena investigated by Fraunhofer. Fraunhofer diffraction n. also Fraunhofer's diffra…

a spectrum of light emitted or absorbed by a gas.

the spectrum produced by a diffraction-grating (diffraction, n. 2); so interference colour, interference phenomena, interference screen, etc.

a spectrum of the light produced when a substance is vaporized in an otherwise non-luminous flame.

a spectrum of electromagnetic radiation transmitted through a substance, showing dark lines or bands due to absorption at specific wavelengths.

the spectrum of the light emitted by a substance when it is excited to fluorescence.

Physics. A group of closely-spaced lines, esp. in a molecular spectrum; band spectrum n. a spectrum characterized by such bands.

a spectrum formed for comparison, wave-length by wave-length, with the spectrum under observation.

The infra-red part of the spectrum; near, far infra-red, the part close to, or far from, the visible spectrum.

a spectrum which shows the radiations from an emitting source.

a spectrum of emitted radiation consisting of or containing X-rays; the distribution of the X-rays emitted by something, esp. as a source of…