Abstract
It was seen in Chapter 1 that, for the simple case considered, the rate of change of the population difference between two energy levels in a paramagnetic ion after the removal of the disturbing signal is given by
where the spin-lattice relaxation time T 1 is defined by this equation. The solution takes the form
which shows that, after the disturbance, the rate at which the spin system returns to its thermal equilibrium distribution follows an exponential law, characterized by the time constant T 1. This indicates that T 1 may be derived from measurements of the variation of population difference as a function of time. Electron spin resonance admirably suits this purpose, since the amplitude of the absorption signal itself is readily shown to be directly proportional to the instantaneous difference in population between the two levels concerned.
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© 1969 K. J. Standley and R. A. Vaughan
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Standley, K.J., Vaughan, R.A. (1969). Techniques Employing Microwave Pulse Saturation with Monitored Recovery. In: Electron Spin Relaxation Phenomena in Solids. Monographs on Electron Spin Resonance. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6539-4_7
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DOI: https://doi.org/10.1007/978-1-4899-6539-4_7
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