12 Questions
Which radiant source has a positive temperature coefficient and does not require preheating?
The Globar
What is the temperature of the Nernst Glower radiant source?
1,800 K
Which radiant source provides greater photon output than Nernst glower below 1700 cm-1 for the same energy consumption?
The Globar
Which type of radiant source requires preheating before it functions properly?
Nernst Glower
In an FTIR instrument, what does the interferometer do?
Converts time domain to frequency domain
Which type of IR analysis method uses lasers to provide precise wavelength measurements?
FT-IR
What is the range of wavelengths for Mid IR (MIR) spectroscopy?
714.29 - 1,000,000 nm
What property of a molecule makes it 'IR active' in IR spectroscopy?
Presence of a strong dipole moment
How can you tell if a molecule can absorb IR radiation?
By assessing the presence of a dipole moment
Which region of IR spectroscopy is associated with the probe of primary vibrational modes within a molecule?
Mid IR (MIR)
In terms of energy transitions, what distinguishes UV-Vis spectroscopy from IR spectroscopy?
Principle wavelength range
What is the characteristic that determines if a molecule can absorb IR radiation like CO2?
Dipole moment
Test your knowledge on IR spectroscopy including absorption spectroscopy in the NIR, MIR, and FIR regions. Understand how primary vibrational modes within a molecule can be probed using IR spectroscopy and relate it to the Jablonski diagram.
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