  Imidogen (NH) radicals are magnetically trapped and their Zeeman relaxation
and energy transport collision cross sections with helium are measured.
Continuous buffer-gas loading of the trap is direct from a room-temperature
molecular beam. The Zeeman relaxation (inelastic) cross section of magnetically
trapped electronic, vibrational and rotational ground state imidogen in
collisions with He-3 is measured to be 3.8 +/- 1.1 E-19 cm^2 at 710 mK. The
NH-He energy transport cross section is also measured, indicating a ratio of
diffusive to inelastic cross sections of gamma = 7 E4 in agreement with the
recent theory of Krems et al. (PRA 68 051401(R) (2003))
