Infrared Absorption Spectroscopy

HideShow resource information
A technique in which all frequencies are examined simultaneously
Fourier Transform Infrared
1 of 12
What does a monochromator do?
Splits light into its individual frequencies so they can be measured one at a time
2 of 12
When does the molecule absorb infrared radiation?
When the frequency of a vibration is equal to the frequency of the IR radiation
3 of 12
How do you prepare a vapour phase sample?
Introduce it to a special cell and add 10cm NaCl
4 of 12
How do you prepare a liquid sample?
Squeeze between flat plates of sodium chloride
5 of 12
How do you prepare a solid sample?
Combine with Nujol to create a mull then sandwich between KBr pellets
6 of 12
What is the wavelength calibrator?
Polystyrene film
7 of 12
Which sampling technique uses a curved mirror to reflect all radiation diffusely reflected from a surface and focuses it onto the detector?
Diffuse reflectance
8 of 12
Which sampling technique involves the sample being placed in direct contact with an optically flat crystal so a correct IR angle will allow total internal reflection?
Attenuated Total Reflectance
9 of 12
What is retardation?
When the path length of the beam splitter to fixed mirror and to the movable mirror vary and may not always be in phase
10 of 12
As reduce mass decreases _______
stretching frequency decreases
11 of 12
As bond order increases ________
stretching frequency increases
12 of 12

Other cards in this set

Card 2

Front

What does a monochromator do?

Back

Splits light into its individual frequencies so they can be measured one at a time

Card 3

Front

When does the molecule absorb infrared radiation?

Back

Preview of the front of card 3

Card 4

Front

How do you prepare a vapour phase sample?

Back

Preview of the front of card 4

Card 5

Front

How do you prepare a liquid sample?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Analytical Chemistry resources »