Infrared Spectroscopy Quiz

What is Infrared?

• Infrared radiation lies between the visible and microwave portions of the electromagnetic spectrum.

• Infrared waves have wavelengths longer than visible and shorter than microwaves.

• The primary source of infrared radiation is thermal radiation (heat).

• Infrared Spectroscopy is simply the study of the interaction of Infrared light with matter.

What are the types of energy transitions in each region of the electromagnetic spectrum?

• Bond-breaking

• Electronic

• Vibrational

• Rotational

What are the different ways in which the atoms in a molecule can move relative to one another?

• Stretching Modes

• Bending Modes

• Vibrational Modes

• Rotational Modes

What is the formula for Hook's Law?

• ν = 1/2л√K/μ

• ν = C/λ

• Wavenumber = 1/λ

• ν = 1/2лC √K/μ

What is the significance of the 'Fingerprint' Region in infrared spectroscopy?

• It identifies the various functional groups of the molecule.

• It results in significant changes in the distribution of absorption peaks.

• It extends from about 1200 to 700 cm-1.

• It is used for quantitative analysis.

What is FTIR?

• Fourier Transform Infrared

• Fast Thermal Infrared

• Frequency Transform Infrared

• Fourier Thermal Infrared

What are the advantages of FTIR?

• Non-destructive technique

• Good precision

• High speed

• All of the above

What are the disadvantages of FTIR?

• Cannot detect atoms or monoatomic ions

• Cannot detect molecules comprised of two identical atoms

• Aqueous solutions are very difficult to analyze

• All of the above

What information can FT-IR provide?

• Identify unknown material

• Determine quality or consistency of sample

• Determine amount of components in mixture

• All of the above

What is the role of the grating in IR spectroscopy?

• To separate IR light

• To amplify the signal

• To hold the sample

• To detect the light