THE ZEEMAN EFFECT IN THE OPTICAL SPECTRUM OF MANGANESE MONOHYDRIDE: MnH1

Author Institution: Department of Chemistry and Biochemistry, Arizona State \\University, Tempe, AZ, USA 85287; Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesselschaft, Faradayweg 4-6, 14195 Berlin, GermanyThe only successful demonstration of buffer-gas cooling and magnetic trapping of paramagnetic molecules was that performed by Doyle and co-workers in 1998} \textbf{395}, 148 (1998).}. It is anticipated that the relatively large rotational spacing and small spin-spin and spin-rotation interaction in the $X^7\Sigma^+$ (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, $X^7\Sigma^+$ (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 $P_{1}$(0) branch feature ($\nu$ = 17568.3536 cm$^{-1}$) of the $A^7\Pi - X^7\Sigma^+$ (0,0) band system of MnH was selected for Zeeman measurements. The field free spectra is complicated but has been thoroughly analyzed} \textbf{95}(3), 1563-1576 (1991).}'} \textbf{156}, 296-318 (1992).}'} \textbf{241}, 192 (2007).}