Which of the following information is provided by UV-Vis Spectroscopy: Charge-Transfer Absorption Electronic Transitions involving , and

 Which of the following information is provided by UV-Vis Spectroscopy:

Charge-Transfer Absorption

Electronic Transitions involving σ,π and n electrons

The concentration of a given absorbing specie

Plasmon resonance peak of 20 nm gold nanoparticles

All of the above

None of the above

As the concentration of Au NPs increases, the peak plasmon resonance:

• remains the same position, but its intensity increases
• shifts to shorter wavelengths and sharpens with an increase in the intensity
• shifts to longer wavelengths and broadens with a decrease of the intensity
• None of the above