3.4 The Franck-Condon Principle and Fermi's Golden Rule

[@LouisHillJ]

Really helped with clearing up some questions I had for my university course on this topic, thanks!

[@rockbobrocks]

What an excellent explanation and connection of these three highly important principles in luminescence spectroscopy! Compact and on point!

[@mevansthechemist]

Thanks Toni!

[@lorenzodebiasirobles3048]

Muy buen video!

[@bagggg445]

Hi Michael, any chance you could clear up this confusion for me? cramming photochem rn Relating to stokes shift, the question is what are the reasons that the GS v=0- ES v= 0 transition of the same molecules absorbance and emission spectra do not overlap. I understand the first excited state generally decays to a higher vibrational level of the GS initially, then decays to the ground vibrational level, but is this still considered a v=0 to v=o transition? Cant really reason why a direct 0-0 transition would have a stokes shift and not overlap. Again online sources say it is because the electron initially relaxes to a higher vibrational level of the ground state, but I dont think thats considered a 0-0 transition? Is it related to non-overlap of vib wave functions / internuclear distances visible on a FC diagram? does this lower the energy of emission ? or is it solvent reorg? Thanks!

[@alexe1751]

nice videos. a small opinion, 14.01: the filled circles are deuterated.

[@XiaoranHu-u9k]

So H-derived are faster, right? H is lighter and vibrates more violently.