FTIR Tutorial

Quiz 1 - FTIR Theory

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Question 1
How is the wavelength controlled in an FTIR spectrometer?
a. By a Michelson Interferometer
b. By a computer
c. By a laser
d. By calibration with a standard sample

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Question 2
What type of technique is FTIR spectroscopy?
a. A dispersive technique?
b. An emission technique
c. An absorbance technique
d. A UV-Vis technique
e. A reflectance technique

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Question 3
How is the detector on the Mattson RS/1 FTIR spectrometer cooled?
a. With water
b. With liquid nitrogen
c. With a fan
d. By Peltier cooling
e. It's not.

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Question 4
What does the spectrum of Nitrogen(N2) look like?
a. The same as that of air
b. It has only p- and r-branches
c. The same as that of carbon monoxide
d. It doesn't have one!

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Question 5
What are the selection rules for FTIR absorption?

A: Absorption only occurs for symmetrical molecules

B: Absorption only occurs with a dipole change

C: Absorption requires an odd vibrational quantum number

D: Absorption requires promotion to a new quantum level

1. C and D
2. All A,B,C AND D
3. A and D
4. A, B and C
5. B and D

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Question 6
What occurs when the moving mirror in an FTIR spectrometer is the same distance from the beamsplitter as the static mirror?
a. Constructive interference
b. Destructive interference
c. Radio interference
d. The spectrum is measured

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Question 7
Which infrared technique can measure two spectra at once?
a. FTIR spectroscopy
b. FTIR-ATR spectroscopy
c. Dispersive infrared spectroscopy
d. FTIR microscopy
e. none

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Question 8
Which spectrometer is the more complicated: dispersive or FTIR?
a. Dispersive
b. FTIR
c. neither

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Question 9
In what region of the spectrum does infrared radiation occur?
a. At the low-energy end
b. Between the visible and ultraviolet regions
c. Between the visible and microwave regions
d. Between the visible and x-ray regions
e. At the high-energy end

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Question 10
What occurs when a molecule absorbs infrared radiation?
a. It warms up
b. It flies around
c. It spins faster
d. It vibrates faster
e. It emits light