4. Characterization Techniques
Optical Spectroscopy — Quiz
Test your understanding of optical spectroscopy with 5 practice questions.
Practice Questions
Question 1
Which phenomenon is responsible for the redshift observed in the UV-Vis absorption spectrum of larger semiconductor nanoparticles compared to smaller ones?
Question 2
In Raman spectroscopy, the intensity of a particular Raman band is directly proportional to which of the following properties of the vibrational mode?
Question 3
A nanomaterial exhibits strong photoluminescence emission. If the excitation wavelength is 300 nm and the emission peak is observed at 350 nm, what is the energy difference between the excitation and emission photons in eV? (Given: Planck's constant $h = 4.135 \times 10^{-15}$ eV·s, speed of light $c = 3 \times 10^8$ m/s)
Question 4
Which of the following factors is most likely to cause a significant broadening of the UV-Vis absorption peaks in a solution of semiconductor quantum dots?
Question 5
In surface-enhanced Raman spectroscopy (SERS), what is the primary mechanism responsible for the significant enhancement of the Raman signal?