Publication

The temperature dependence of the cage effect in the gas phase

Hubert van den Bergh
1978
Journal Articles

Abstract

The photodissocn. of I2 was studied in the gas phase by laser flash photolysis. The decrease of the quantum yield with increasing C2H5 and C3H8 pressure is interpreted in terms of the cage effect. As the temp. is increased a less pronounced cage effect is obsd. The trends in the measured quantum yields with changing temp. and pressure agree with model calcns. for dissocn. in a viscous continuum. However the simple model applied is not useful for quant. predictions. The 2nd order rate const. for 1 atom recombination increases slightly with increasing temp.

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https://infoscience.epfl.ch/entities/publication/cbc95644-4d03-40cf-b7c5-689857eec460

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Hubert van den Bergh
1978
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/cbc95644-4d03-40cf-b7c5-689857eec460

About this result

Related concepts (32)

Fluid mechanics

Fluid mechanics is the branch of physics concerned with the mechanics of fluids (liquids, gases, and plasmas) and the forces on them. It has applications in a wide range of disciplines, including mechanical, aerospace, civil, chemical, and biomedical engineering, as well as geophysics, oceanography, meteorology, astrophysics, and biology. It can be divided into fluid statics, the study of fluids at rest; and fluid dynamics, the study of the effect of forces on fluid motion.

Viscosity

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Viscosity is defined scientifically as a force multiplied by a time divided by an area. Thus its SI units are newton-seconds per square metre, or pascal-seconds. Viscosity quantifies the internal frictional force between adjacent layers of fluid that are in relative motion.

Fluid dynamics

In physics, physical chemistry and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids—liquids and gases. It has several subdisciplines, including aerodynamics (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion). Fluid dynamics has a wide range of applications, including calculating forces and moments on aircraft, determining the mass flow rate of petroleum through pipelines, predicting weather patterns, understanding nebulae in interstellar space and modelling fission weapon detonation.

Related publications (2)

The temperature dependence of the cage effect in the gas phase

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Temperature effects in (photo)electrochemical devices for solar fuels and chemicals production

Modeling of rough contact interfaces with trapped compressive liquid pockets