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Questions and Answers
Which phenomenon is responsible for the generation of surface plasmon resonance?
Which phenomenon is responsible for the generation of surface plasmon resonance?
- Coherent excitation of all free electrons in the conduction band
- Transition between energy levels of incident radiation
- Inphase oscillation of free electrons
- Interaction between incident radiation and electron magnetic field (correct)
What happens when the size of a metal nanocrystal is larger than the wavelength of incident radiation?
What happens when the size of a metal nanocrystal is larger than the wavelength of incident radiation?
- Surface plasmon resonance is generated
- No interaction occurs between the nanocrystal and the incident radiation (correct)
- The material becomes opaque
- The material becomes transparent
What determines the color of a material in surface plasmon resonance?
What determines the color of a material in surface plasmon resonance?
- The transition between energy levels of the material (correct)
- The wavelength of the incident radiation
- The energy levels of the material
- The size of the metal nanocrystal
What can nanoparticles do in relation to specific wavelengths of light?
What can nanoparticles do in relation to specific wavelengths of light?
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Study Notes
Surface Plasmon Resonance
- Incident light striking a metal surface at a specific angle generates surface plasmon resonance, causing collective oscillations of electrons at the surface.
Interaction of Incident Radiation with Metal Nanocrystals
- When the size of a metal nanocrystal is larger than the wavelength of incident radiation, the radiation scatters off the nanocrystal.
Color Determination in Surface Plasmon Resonance
- The color of a material in surface plasmon resonance is determined by the specific wavelengths of light that are absorbed or scattered by the material.
Nanoparticles and Specific Wavelengths of Light
- Nanoparticles can absorb or scatter specific wavelengths of light, resulting in unique optical properties.
- This interaction between nanoparticles and incident light can lead to selective absorption or emission of certain wavelengths, influencing the material's color.
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