JAMIE GENGLER AND TIMOTHY C. STEIMLE, Department of Chemistry and Biochemistry, Arizona State
University, Tempe, AZ, USA 85287; MICHAEL STOLL, Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesselschaft, Faradayweg 4-6, 14195 Berlin, Germany.
The only successful demonstration of buffer-gas cooling and magnetic trapping of paramagnetic molecules was that performed by Doyle and co-workers in 1998. It is anticipated that the relatively large rotational spacing and small spin-spin and spin-rotation interaction in the X7 + (v = 0) state of MnH is a signature of a favorable ratio of elastic to inelastic collisions with helium atoms which is required for buffer-gas cooling and trapping. Furthermore, the large magnetic moment of the N = 0, X7 + (v = 0) state of MnH enables one to create a deep trap, and this allows a large enough trapping time to be able to isolate the sample from its environment by cryopumping the helium away. Here we report on the magnetic properties of MnH studied as a necessary preliminary to our use of it in buffer-gas cooling and magnetic trapping experiments. The Zeeman effect in the P1(0) branch feature ( = 17568.3536 cm-1) of the A7 - X7 + (0,0) band system of MnH was selected for Zeeman measurements. The field free spectra is complicated but has been thoroughly analyzed''.