Emission spectrum of an ultraviolet deuterium arc lamp clearly showing characteristic hydrogen emission lines (sharp peaks at 656 nm and 486 nm) and continuum emission in the ~160-400 nm region. The emission spectrum of deuterium differs slightly from that of protium due to the influence of hyperfine interactions, though these effects alter the wavelength of the lines by mere fractions of a nanometer and are too fine to be discerned by the spectrometer used here.
A deuteriumarc lamp or simply deuterium lamp is a low pressuregas discharge light source often used in spectroscopy when a full spectrum (continuous) source of illumination in the ultraviolet region is needed. The origin of the continuum ultraviolet radiation which extends from around 160 nanometers to 400 nanometers arises not from the relatively simple process of decay of atomic excited states ("atomic emission") but instead from "molecular emission" processes, where radiative decay of excited states, in this case of molecular deuterium (D2) cause the effect. This effect is somewhat analogous to the visible light continuum molecular emission of sulfur lamps. Image File history File links Download high resolution version (2715x1816, 68 KB) Summary Spectrum of a deuterium lamp taken with an Ocean Optics HR4000 spectrometer [1] using a high-OH solarization-resistant fiber optic. ... Image File history File links Download high resolution version (2715x1816, 68 KB) Summary Spectrum of a deuterium lamp taken with an Ocean Optics HR4000 spectrometer [1] using a high-OH solarization-resistant fiber optic. ... In most modern usages of the word spectrum, there is a unifying theme of between extremes at either end. ... Protium can be several things: In chemistry, protium is the most common isotope of the element hydrogen; that has one proton and no neutrons. ... Hyperfine structure is a small perturbation in the energy levels (or spectral) of atoms due to the proton-electron dipole moment interaction. ... A nanometre (American spelling: nanometer) is 1. ... // Headline text Bold text:For Acoustic uses in spectrographs of sound waves, see below. ... Deuterium, also called heavy hydrogen, is a stable isotope of hydrogen with a natural abundance in the oceans of one atom in 6400 of hydrogen (see VSMOW; the abundance changes slightly from one kind of natural water to another). ... The 300,000-watt Plasma Arc Lamp in the Infrared Processing Center (IPC) at Oak Ridge National Laboratory An arc lamp is a device that produces light by the sparking (or arcing, from voltaic arc or electric arc) of a high current between two carbon rod electrodes. ... Pressure (symbol: p) is the force per unit area acting on a surface in a direction perpendicular to that surface. ...-1... Extremely high resolution spectrum of the Sun showing thousands of elemental absorption lines (fraunhofer lines) Spectroscopy is the study of spectra, that is, the dependence of physical quantities on frequency. ... Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than soft X-rays. ... In quantum mechanics, an excited state of a system (such as an atom, molecule or nucleus) is any quantum state of the system that has a higher energy than the ground state (that is, more energy than the absolute minimum). ... The sulfur lamp is a microwave-powered electrodeless lighting system conceived by engineer Michael Ury, physicist Charles Wood and their colleagues in 1990 and further developed in 1994 by Fusion Lighting (USA), with support from the U.S. Department of Energy. ...
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