L4 Rich: raman spectroscopy

Question 1

what happens with light during Raman spectroscopy?

Answer 1

most of the light is absorbed and transmitted but some is scattered.

Question 2

How can scattering of the light be observed?

Answer 2

It can be observed at a right angle to the incident beam

Question 3

when scattering frequency is equal to incident frequency it is known as?

Answer 3

Rayleigh scattering

Question 4

1% of scattered intensity occurs at a different frequency to the incident frequency.what is this called?

Answer 4

Raman scattering

Question 5

what is Raman interactions dependent on?

Answer 5

existence of polarisable bonds

Question 6

are larger atoms more polarisable?

Answer 6

yes

Question 7

what can be used as a solvent tin Raman spectroscopy?

Answer 7

water

Question 8

whats the rule of mutual exclusion when there is centre of symmetry?

Answer 8

If a molecule has a centre of symmetry then Raman active vibrations are infrared inactive and vice versa.

Question 9

whats the rule of mutual exclusion when there is no centre of symmetry?

Answer 9

If there is no centre of symmetry, some vibrations may be both Raman and infrared active

Question 10

Vibrations with a change in dipole moment give ___ _____

Answer 10

IR bands

Question 11

Highly ____ bonds ____ intense IR bands

Answer 11

polar

intense

Question 12

Highly polar bonds give ____ spectra of ____ intensity

Answer 12

Raman

Low

Question 13

what samples can be used with RS?

Answer 13

gas, liquid, solid

Question 14

is RS qualitative or quantitative?

Answer 14

mainly qualitative

Question 15

is RS destructive?

Answer 15

no

Question 16

where can RS be applied?

Answer 16

Drugs Paints Fibres Inks Explosives

Question 17

what is RS complementary to?

Answer 17

IR spectroscopy