Campbell, Wesley C.Tsikata, EdemLu, Hsin-Ivan Buuren, Laurens D.Doyle, John2016-08-232007Campbell, Wesley C., Edem Tsikata, Hsin-I Lu, Laurens D. van Buuren, and John M. Doyle. 2007. “ Magnetic Trapping and Zeeman Relaxation of NH (X3∑-) .” Physical Review Letters 98 (21) (May 25). doi:10.1103/physrevlett.98.213001.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:27868184NH 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 NH molecules in collisions with He3 is measured to be 3.8±1.1×10−19  cm2 at 710 mK. The NH-He energy transport cross section is also measured, indicating a ratio of diffusive to inelastic cross sections of γ=7×104, in agreement with recent theory [R. V. Krems, H. R. Sadeghpour, A. Dalgarno, D. Zgid, J. Kłos, and G. Chałasiński, Phys. Rev. A 68, 051401 (2003)].en-USJournal Article2016-08-2310.1103/PhysRevLett.98.213001