recombination time

recombination time

The period in the Universe's history, according to the Big Bang theory, after which the temperature was low enough for atoms to form from free nuclei and electrons. This required a temperature of less than about 3000 K, which occurred when the Universe had expanded for about 300 000 years. At the time of recombination the radiation in the Universe began to propagate freely and ceased to interact with free electrons. This freely propagating radiation now resides in the microwave background. The name ‘recombination’ is a misnomer because neutral atoms are formed for the first time at the recombination era, never having existed previously.
References in periodicals archive ?
A special effort will be devoted to tune the spin-orbit coupling by different elements, since this could be at the origin of the long recombination time of the photo-electrons.
Mola showed, by means of computational methods, that using QD layers of different sizes in solar cell active zone alongside the recombination time of carriers at QD affects the improvement of InxGa1-xN/GaN QD solar cells efficiency.
If the required electrical pulse length is longer than the recombination time, as can be the case with GaAs (recombination time 1 ns), then the optical energy required to keep the switch closed is increased since carriers have to be generated within the switch continually.