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Ausstrahlung

Ausstrahlung is a German term that literally means emission or radiance. In physics it denotes the process by which a body or system emits energy as electromagnetic radiation. This includes thermal radiation from heated objects, as well as luminescence from excited atoms or molecules, such as fluorescence or phosphorescence. The emission can be spontaneous, arising from transitions between energy levels, or stimulated, induced by external radiation.

Key concepts include spontaneous and stimulated emission, Planck's law and blackbody radiation, emissivity, and Kirchhoff's law,

Applications and measurement of Ausstrahlung are central to radiative transfer, temperature determination from spectra, and the

Other meanings: in everyday German, Ausstrahlung also denotes a person’s aura or charisma—the impression someone gives

See also: radiation, emission, emissivity, blackbody radiation, spectroscopy.

which
links
emissivity
to
absorptivity.
The
total
radiant
power
from
a
body
scales
with
temperature
and
surface
area
according
to
the
Stefan-Boltzmann
law,
and
the
peak
of
the
emission
spectrum
shifts
with
temperature
according
to
Wien's
displacement
law.
design
of
detectors
such
as
radiometers
and
spectrometers.
In
astrophysics,
stellar
radiation
provides
information
about
surface
temperature,
composition,
and
physical
conditions.
In
engineering,
controlling
Ausstrahlung
is
important
for
thermal
insulation,
energy
efficiency,
and
thermal
management
in
devices
and
buildings.
as
if
radiating
confidence
or
charm.