Hamiltonian for a restricted isoenergetic thermostat

Nonequilibrium molecular dynamics simulations often use mechanisms called t hermostats to regulate the temperature. A Hamiltonian is presented for the case of the isoenergetic (constant internal energy) thermostat correspondin g to a tunable isokinetic (constant kinetic energy) thermostat, for which a Hamiltonian has recently been given. [S1063-651X(99)01612-8].