Rotational temperature
Encyclopedia
The rotational temperature is commonly used in thermodynamics
, to simplify certain equations. It has units of temperature
and is defined as
Where
is the rotational constant, and k is the Boltzmann constant, given in wavenumber
s per kelvin
(the value of this is ~ 0.695 cm−1/K).
The rotational temperature is used commonly when finding the rotational partition function. There is much more relating to these quantities in rotational spectroscopy
and the article regarding the rotational constant.
Thermodynamics
Thermodynamics is a physical science that studies the effects on material bodies, and on radiation in regions of space, of transfer of heat and of work done on or by the bodies or radiation...
, to simplify certain equations. It has units of temperature
Temperature
Temperature is a physical property of matter that quantitatively expresses the common notions of hot and cold. Objects of low temperature are cold, while various degrees of higher temperatures are referred to as warm or hot...
and is defined as
Where
is the rotational constant, and k is the Boltzmann constant, given in wavenumberWavenumber
In the physical sciences, the wavenumber is a property of a wave, its spatial frequency, that is proportional to the reciprocal of the wavelength. It is also the magnitude of the wave vector...
s per kelvin
Kelvin
The kelvin is a unit of measurement for temperature. It is one of the seven base units in the International System of Units and is assigned the unit symbol K. The Kelvin scale is an absolute, thermodynamic temperature scale using as its null point absolute zero, the temperature at which all...
(the value of this is ~ 0.695 cm−1/K).
The rotational temperature is used commonly when finding the rotational partition function. There is much more relating to these quantities in rotational spectroscopy
Rotational spectroscopy
Rotational spectroscopy or microwave spectroscopy studies the absorption and emission of electromagnetic radiation by molecules associated with a corresponding change in the rotational quantum number of the molecule...
and the article regarding the rotational constant.
See also
- Rotational spectroscopyRotational spectroscopyRotational spectroscopy or microwave spectroscopy studies the absorption and emission of electromagnetic radiation by molecules associated with a corresponding change in the rotational quantum number of the molecule...
- Vibrational spectroscopy
- Infrared spectroscopyInfrared spectroscopyInfrared spectroscopy is the spectroscopy that deals with the infrared region of the electromagnetic spectrum, that is light with a longer wavelength and lower frequency than visible light. It covers a range of techniques, mostly based on absorption spectroscopy. As with all spectroscopic...
- SpectroscopySpectroscopySpectroscopy is the study of the interaction between matter and radiated energy. Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, e.g., by a prism. Later the concept was expanded greatly to comprise any interaction with radiative...