Illustrated Glossary of Organic Chemistry
Stretching frequency:
The energy of
photons
absorbed to cause
molecular vibrations
, plotted as the
x
-axis of an
infrared spectrum
. The term can be misleading because the
infrared spectrum
x
-axis energy unit is
cm
-1
, a wavelength unit, and not a frequency unit.
Infrared spectrum
of 2-
butan
one
, with stretching frequency along the
x
-axis.
Related terms:
Wavelength
,
λ
,
wavenumber
,
mass spectrometry
,
m/z
,
NMR spectroscopy
,
chemical shift
,
ppm
Wikipedia entry
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