please compare the energies of excitation and emission for fluorescence. Which is greater and why?

When a molecule absorbs energy, electrons are excited from the ground state (S₀) to different vibrational levels of the excited state (S₁) in about 1 fs.

In the next picosecond, most of them will drop to the lowest vibrational level of S₁.

They remain there for about 10 ns, and then they drop to different vibrational levels of S₀.

The excitation energy is always greater than the emission energy because excitation occurs from the ground state of S₀ to a higher vibrational level of S₁, while emission occurs from the lowest vibrational level of S₁ to a higher vibrational of S₀.

pstnonsonjoku pstnonsonjoku · Answer 2 · 2022-04-05T13:40:32+02:00

The excitation energy of fluorescence is greater than the emission energy.

What is excitation energy?

Excitation has to do with absorption of energy by a ground state molecule in (S₀) moving it to a different vibrational levels (S₁) which is higher in about 1 fs.

It the subsequently drops in one picosecond, most of them will drop to the lowest vibrational level of S₁.

Note that excitation energy must be greater than emission energy owing to the fact that excitation begins at the ground state moving up to a higher vibrational level , while emission begins at the lowest vibrational level moving up to a higher vibrational levels.

Learn more about excitation: https://brainly.com/question/867804