1
Many scientists were also reminded of the Mössbauer effect, a process involving nuclear transitions in a solid.
2
Furthermore, nonlinearity of the oscillating cloud would produce both spatial and temporal harmonics, so nuclear transitions of higher multipolarity could also be driven at multiples of the laser frequency.
3
NAA is significantly different from other spectroscopic analytical techniques in that it is based not on electronic transitions but on nuclear transitions.
4
The emission and absorption of X-rays by gases had been observed previously, and it was expected that a similar phenomenon would be found for gamma rays, which are created by nuclear transitions (as opposed to X-rays, which are typically produced by electronic transitions).
5
In general, gamma rays are produced by nuclear transitions from an unstable high-energy state to a stable low-energy state.