Simultaneous observation of NMR spin noise and maser spontaneous emission

Spin noise emission, absorbed noise, and spontaneous maser emission are distinguished in the hexanol molecule by changing spin noise dynamics along with coupling the spin system to a probe circuit. Inverted magnetization leads to spontaneous maser emission of methyl and methylene resonances permitting separation from broad overlapped peaks. The maser emission resonance shows random intensity the scattering range of which depends on the length of the gradient following magnetization inversion. Combination of thermal noise and spin noise can be altered by varying magnetization orientation. This results in radiation damping which alters how fluctuation signals are coupled with the probe circuit. (C) 2015 Elsevier B.V. All rights reserved.