Thanks you for the video. Can you direct me toward litheratures o rbook which are related to transient absorption ? i am a newbie and i am learning. i am interested to know the transient abtorption of diffrent molecules, e.g n2 or o2 etc.
not really, if the excited state is not populated, no transient effects can be observed - neither ground state bleaching (GSB) nor excited state absorption (ESA). If you are interested in the lifetime of the excited state, both contributions (GSB and ESA) decay with the same rate constant (the rate at which the excited state depopulates is equal to the rate at which the ground state repopulates), so both effects are useful for a global fitting analysis. If you are interested in the spectrum of the excited state, you need to have it populated to observe the ESA (you'll observe the GSB as well, but you can subtract it since you know the shape of the absorption band from steady-state measurements).
Thank you for the clear and concise explanation!
Very helpful for a first insight, thank you!
Thank you for this lesson! Please also put in the description to what series this video belongs.
Thanks you for the video.
Can you direct me toward litheratures o rbook which are related to transient absorption ? i am a newbie and i am learning.
i am interested to know the transient abtorption of diffrent molecules, e.g n2 or o2 etc.
So the excited state population must be kept low to prevent the ground state bleaching right?
not really, if the excited state is not populated, no transient effects can be observed - neither ground state bleaching (GSB) nor excited state absorption (ESA). If you are interested in the lifetime of the excited state, both contributions (GSB and ESA) decay with the same rate constant (the rate at which the excited state depopulates is equal to the rate at which the ground state repopulates), so both effects are useful for a global fitting analysis. If you are interested in the spectrum of the excited state, you need to have it populated to observe the ESA (you'll observe the GSB as well, but you can subtract it since you know the shape of the absorption band from steady-state measurements).
Thankyou