Publication

Internal temperatures of neutral sodium clusters: a PIE-thermometer

1989
Journal Articles

Abstract

Distinct temp. effects could be obsd. in the threshold regions of photoionization efficiency (PIE) measurements of Na clusters. Simulations of the PIE thresholds at various temps. were carried out with a simple, semiclassical model. Fitting the simulations to the exptl. data allows to correct ionization potential assignments for thermal effects and est. internal temps. of polyat. N clusters. [on SciFinder (R)]

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1989
Journal Articles

Abstract

Official source

Related concepts (25)

Temperature

Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have relied on various reference points and thermometric substances for definition. The most common scales are the Celsius scale with the unit symbol °C (formerly called centigrade), the Fahrenheit scale (°F), and the Kelvin scale (K), the latter being used predominantly for scientific purposes.

Thermodynamic temperature

Thermodynamic temperature is a quantity defined in thermodynamics as distinct from kinetic theory or statistical mechanics. Historically, thermodynamic temperature was defined by Lord Kelvin in terms of a macroscopic relation between thermodynamic work and heat transfer as defined in thermodynamics, but the kelvin was redefined by international agreement in 2019 in terms of phenomena that are now understood as manifestations of the kinetic energy of free motion of microscopic particles such as atoms, molecules, and electrons.

Internal energy

The internal energy of a thermodynamic system is the energy contained within it, measured as the quantity of energy necessary to bring the system from its standard internal state to its present internal state of interest, accounting for the gains and losses of energy due to changes in its internal state, including such quantities as magnetization. It excludes the kinetic energy of motion of the system as a whole and the potential energy of position of the system as a whole, with respect to its surroundings and external force fields.

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Internal temperatures of neutral sodium clusters: a PIE-thermometer

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