Flashcards in L4 Rich: raman spectroscopy Deck (17):
what happens with light during Raman spectroscopy?
most of the light is absorbed and transmitted but some is scattered.
How can scattering of the light be observed?
It can be observed at a right angle to the incident beam
when scattering frequency is equal to incident frequency it is known as?
1% of scattered intensity occurs at a different frequency to the incident frequency.what is this called?
what is Raman interactions dependent on?
existence of polarisable bonds
are larger atoms more polarisable?
what can be used as a solvent tin Raman spectroscopy?
whats the rule of mutual exclusion when there is centre of symmetry?
If a molecule has a centre of symmetry then Raman active vibrations are infrared inactive and vice versa.
whats the rule of mutual exclusion when there is no centre of symmetry?
If there is no centre of symmetry, some vibrations may be both Raman and infrared active
Vibrations with a change in dipole moment give ___ _____
Highly ____ bonds ____ intense IR bands
Highly polar bonds give ____ spectra of ____ intensity
what samples can be used with RS?
gas, liquid, solid
is RS qualitative or quantitative?
is RS destructive?
where can RS be applied?
Drugs Paints Fibres Inks Explosives