text: Bloch, Wangsness, and Redfield developed a rigorous quantum mechanical model of this phenomenon.
full_question: Bloch, Wangsness, and Redfield developed a rigorous quantum mechanical model of this phenomenon. Two different mech- anisms causing this phenomenon cancel each other out in a TROSY experiment. This phenomenon causes intensity losses between pulses in an INEPT sequence. This process can be mathematically modeled by the Solomon equations. The constants that define this process can be measured using inversion-recovery or Hahn echo experiments. This process causes a reduction in intensity over time of an FID signal. This process leads to magnetization transfer between two nuclei in the nuclear Overhauser effect. Larmor precession and this process are modeled by the Bloch equations. It's not coupling, but this process comes in spin-lattice and spin-spin forms characterized by exponential decay times labelled T1 and T2. For 10 points, name this process in which spins return to their equilibrium values after undergoing NMR.
first_sentence: Bloch, Wangsness, and Redfield developed a rigorous quantum mechanical model of this phenomenon.
raw_answer: spin relaxation