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Penning ionization releases electrons in a state-selected Rydberg gas ofnitric oxide entrained in a supersonic molecular beam. Subsequent processes ofelectron impact avalanche, bifurcation, and quench form a strongly coupled,spatially correlated ultracold plasma of NO$^+$ ions and electrons thatexhibits characteristics of self-organized criticality. This plasma contains aresidue of nitric oxide Rydberg molecules. A conventional fluid dynamics ofion-electron-Rydberg quasi-equilibrium predicts rapid decay to neutral atoms.Instead, the NO plasma endures for a millisecond or more, suggesting thatquenched disorder creates a state of suppressed electron mobility. Supportingthis proposition, a 60 MHz radiofrequency field with a peak-to-peak amplitudeless than 1 V cm$^{-1}$ acts dramatically to mobilize electrons, causing theplasma to dissipate by dissociative recombination and Rydberg predissociation.An evident density dependence shows that this effect relies on collisions,giving weight to the idea of arrested relaxation as a cooperative property ofthe ensemble.

Radio frequency field-induced electron mobility in an ultracold plasma state of arrested relaxation