A What’s the meaning of decay rate in optical Bloch equations?

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there is a parameter called decay rate(Γ or γ)in the optcial bloch equation or the equation of motion for the atomic probability amplitude.what‘s the meaning of it?
i have some questions about decay rate.
1:why do we need decay rate in these equations?
2:is it a constant for a specific medium?
3:it can be changed with respect to some conditions like temprature or pressure?
4:how can i know the decay rate of some energy levels in 85Rubidium
 
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hongqiaozhang said:
TL;DR Summary: there is a parameter called decay rate(Γ or γ)in the optcial bloch equation or the equation of motion for the atomic probability amplitude.what‘s the meaning of it?

i have some questions about decay rate.
1:why do we need decay rate in these equations?
2:is it a constant for a specific medium?
3:it can be changed with respect to some conditions like temprature or pressure?
4:how can i know the decay rate of some energy levels in 85Rubidium
##\gamma## describes spontaneous radiative decay between the two energy levels.

For quite detailed quantitative information on atoms, consult NIST Atomic Spectral Database.
 
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