A spectral line resulting from the emission of electromagnetic radiation from an atom or other species as it decays from an excited state to one of lower energy.

An ejaculation or orgasm while asleep, often accompanied by an erotic dream.

(electronics) a flat panel display technology that uses large-area field electron sources to provide electrons that strike coloured phosphors to produce a colour image. In a general sense, an FED consists of a matrix of cathode ray tubes, each tube producing a single sub-pixel, grouped in threes to form red-green-blue (RGB) pixels.

plural of field emission microscope

plural of zero-emission vehicle

A vehicle that produces only carbon dioxide and water as its emissions and so does not pollute the air.

(medicine) A medical imaging technique which detects the gamma rays produced by positrons emitted from injected radionuclides.

(physics) a technique that uses field emission of electrons or positive ions from the needle-shaped tip of an emitter to produce a magnified image of the emitter surface (showing each atom) on a fluorescent screen

(physics) the instrument used in field emission microscopy

(physics, chemistry) A form of analytical spectroscopy that measures the radiation emitted at specific wavelengths by the atoms in a very hot sample