  Pairing of particles, in particular electrons, in high temperature plasma is
generally not expected to occur. Here we investigate, based on earlier work,
the possibility for electron pairing mediated in the presence of various kinds
of plasma waves. We confirm the possibility for pairing in ion- and
electron-acoustic waves, pointing out the importance of the former and the
expected consequences. While electron-acoustic waves probably do not play any
role, ion-acoustic waves may cause formation of heavy electron compounds. Lower
hybrid waves also mediate pairing but under different conditions. Buneman modes
which evolve from strong currents may cause pairing among trapped electrons
constituting a heavy electron component that populates electron holes. All
pairing processes are found to generate cold pair populations. They provide a
mechanism of electron cooling which can be interpreted as kind of classical
condensation, in some cases possibly accompanied by formation of current
filaments, weak soft-X-ray emission and superfluidity which might affect
reconnection physics.
