Publication

Intensity enhancement of the nitric oxide C2P(v = 0) fluorescence in the presence of rare gases

Majed Chergui
1986
Journal Articles

Abstract

Fluorescence of the predissocd. C2P(v = 0) state of NO in the presence of rare gases was investigated by using selective excitation with synchrotron radiation. In the presence of Ar an anomalous pressure behavior was obsd.: at low pressures (0-30 torr), the fluorescence intensity was quenched, but at higher pressures (30-400 torr) an enhancement of intensity was obsd. Furthermore the C(0)-A(3) cascade was induced. Similar results are reported for the other rare gases except for Xe, for which only quenching was obsd. It is suggested that the intensity enhancement is due to a decrease in the no. of mols. undergoing dissocn. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/20b37339-7cc8-409e-9123-8925af0a0374

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Majed Chergui
1986
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/20b37339-7cc8-409e-9123-8925af0a0374

About this result

Related concepts (32)

Quenching (fluorescence)

In chemistry, quenching refers to any process which decreases the fluorescent intensity of a given substance. A variety of processes can result in quenching, such as excited state reactions, energy transfer, complex-formation and collisions. As a consequence, quenching is often heavily dependent on pressure and temperature. Molecular oxygen, iodine ions and acrylamide are common chemical quenchers. The chloride ion is a well known quencher for quinine fluorescence.

Quenching

In materials science, quenching is the rapid cooling of a workpiece in water, oil, polymer, air, or other fluids to obtain certain material properties. A type of heat treating, quenching prevents undesired low-temperature processes, such as phase transformations, from occurring. It does this by reducing the window of time during which these undesired reactions are both thermodynamically favorable, and kinetically accessible; for instance, quenching can reduce the crystal grain size of both metallic and plastic materials, increasing their hardness.

Fluorescence

Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore a lower photon energy, than the absorbed radiation. A perceptible example of fluorescence occurs when the absorbed radiation is in the ultraviolet region of the electromagnetic spectrum (invisible to the human eye), while the emitted light is in the visible region; this gives the fluorescent substance a distinct color that can only be seen when the substance has been exposed to UV light.

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Intensity enhancement of the nitric oxide C2P(v = 0) fluorescence in the presence of rare gases

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