This process can be enhanced using gallium arsenide/aluminum arsenide heterojunctions, and quantum coherence effects can be used to circumvent the need for it.
This process can be enhanced using gallium arsenide/aluminum arsenide heterojunctions, and quantum coherence effects can be used to circumvent the need for it. Water undergoing this process in star-forming regions leads to the super-strong 22GHz spectral line. The 21cm transition in hydrogen can be exploited to facilitate this process by applying a magnetic field and flipping the electron spins. This phenomenon often leads to a negative absolute temperature, and it is usually created in a three or four level system via a pumping process, after which the system escapes it either through spontaneous or stimulated emission. For 10 points, name this phenomenon in which the majority of particles in a system are in an excited state, which commonly occurs in lasers.
This process can be enhanced using gallium arsenide/aluminum arsenide heterojunctions, and quantum coherence effects can be used to circumvent the need for it.
{Population inversion} (Prompt on {lasing})