Spectroscopy
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Spectroscopy: Understanding Atoms and Molecules through Energy Levels and Emission Spectra, Slides of Physics
An overview of spectroscopy, focusing on the relationship between atomic and molecular energy levels and the emission of photons. Topics include the discrete spectrum of atoms, absorption lines in stellar spectra, and the concept of fluorescence. Helium and neon are used as examples.
Typology: Slides
2012/2013
1 / 6
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Spectroscopy
Atoms
and
Light
Atomic
electron
energy
levels
are
a
source
of
discrete
photon
energies.
Change
from
a
high
to
low
energy
state
produces
a
photon.
Atoms
can
also
absorb
a
photon
to
excite
an
electron.
Absorption
Lines
Ionized
gases
at
a
star’s
surface
absorb
specific
frequencies
of
light.
These
appear
as
dark
lines
in
a
star’s
spectrum.
Since
gases
ionize
at
different
temperatures,
the
appearance
of
lines
indicate
the
temperature
of
the
star.
Molecular
Spectra
Energy states in molecules contribute to stellar spectra. Internuclear distances are quantized in discrete states.
Vibrational energy Angular momentum for the molecule is quantized. - Rotational energy