spectroscopy Flashcards
what type of radiation is absorbed by methane molecules?
Infra red
what effect does IR have on methane molecules?
causes C-H bond to vibrate.
Why do C=O bonds absorb more energy than C-H bonds?
stronger bonds vibrate more than weaker bonds
What radiation is re- emitted from the earths surface?
longer wavelength IR radiation
where is the fingerprint region/ trace on the absorbency graph?
Towards left, between 500 and 1500.
the frequency of stronger bonds is…. because…
higher because stronger bonds vibrate faster than weaker bonds.
the frequency of weaker bonds is … because…
lower because weaker bonds vibrate less than stronger bonds.
bonds can only absorb radiation that…
has the same frequency as the natural frequency of the bond
bonds between lighter atoms…
vibrate at a higher frequency
bonds between heavier atoms…
vibrate at a lower frequency
Absorption of IR Radiation..
makes bonds bend and stretch more
