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Discrete spectra are seen in many other phenomena, such as vibrating strings, microwaves in a metal cavity, sound waves in a pulsating star, and resonances in high-energy particle physics. The general phenomenon of discrete spectra in physical systems can be mathematically modeled with tools of functional analysis , specifically by the ...
In spectroscopy, the Autler–Townes effect (also known as AC Stark effect), is a dynamical Stark effect corresponding to the case when an oscillating electric field (e.g., that of a laser) is tuned in resonance (or close) to the transition frequency of a given spectral line, and resulting in a change of the shape of the absorption/emission spectra of that spectral line.
Lightwave Electronics was a California corporation, which was founded in 1984. Some of the founders were Robert L. Mortensen, a former executive at the laser manufacturer Spectra Physics, and Drs. Robert L. Byer and David Bloom, both professors at Stanford University. The Newport Corporation, then headed by Dr. Milton Chang, was a significant ...
The following is a list of notable unsolved problems grouped into broad areas of physics. [1]Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.
In late 2021, Q Magnetics introduced the QM-125, a 125 MHz (2.9 T) 1H benchtop NMR spectrometer with resolution better than 0.5 Hz. [28] The instrument is contained in a single enclosure with a mass of 28 kg, and is connected to a controlling computer by a USB interface.
Example of a phosphor-coated 125 W lamp. To correct the bluish tinge, many mercury-vapor lamps are coated on the inside of the outer bulb with a phosphor that converts some portion of the ultraviolet emissions into red light. This helps to fill in the otherwise very-deficient red end of the electromagnetic spectrum. These lamps are generally ...
Vibrational spectroscopy in the terahertz (THz) frequency range, 0.1–10 THz, is a fast emerging technique for fingerprinting biological molecules and species. For more than 20 years, theoretical studies predicted multiple resonances in absorption (or transmission) spectra of biological molecules in this range.
The Rydberg–Ritz combination principle is an empirical rule proposed by Walther Ritz in 1908 to describe the relationship of the spectral lines for all atoms, as a generalization of an earlier rule by Johannes Rydberg for the hydrogen atom and the alkali metals.
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