# T1 and T2 time example in NMR and spontaneous emission

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How is the T1 and T2 time in NMR related to T1 and T2 time in spontaneous emission? Also, in quantum dephasing, does T1 not exist while only T2 exists?

• In NMR T2, it is said that it corresponds to a decoherence of the transverse nuclear spin magnetization. What is its correspondence in spontaneous emission?
• This notes p.8 also imply T2 relaxation does not affect the total amount of z-magnetization, but the degree of synchronization of the transverse magnetization components. If only quantum dephasing happens, no x y component of local field (no energy transfer), does this mean that only T2 exist?
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