# FAR-INFRARED LASER MAGNETIC RESONANCE SPECTROSCOPY OF VIBRATIONALLY EXCITED NH

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 Title: FAR-INFRARED LASER MAGNETIC RESONANCE SPECTROSCOPY OF VIBRATIONALLY EXCITED NH Creators: Jackson, M.; Zink, L. R.; Flores-Mijangos, J.; Robinson, A.; Brown, J. M. Issue Date: 2006 Publisher: Ohio State University Abstract: \maketitle The laser magnetic resonance (LMR) spectroscopictechnique has been used to investigate the rotational spectrum of the NH radical in its $^{3}\Sigma^{-}$ ground electronic state. An optically pumped molecular laser was used as a source of radiation in the 26.7683 to 123.3066 cm$^{-1}$ region of the far-infrared. The molecular transitions were brought into resonance with the laser frequency using magnetic fields up to 2 T. Using twenty-seven laser lines, spectra were recorded in both parallel ($\Delta M_{J}$ = 0) and perpendicular ($\Delta M_{J}$ = $\pm$1) polarizations. Observation of the $N^{\prime}$ $\leftarrow$ $N^{\prime\prime}$ = 1 $\leftarrow$ 0, 2 $\leftarrow$ 1, 3 $\leftarrow$ 2 and 4 $\leftarrow$ 3 transitions in the first and second excited vibrational levels of NH allows its molecular parameters (particularly the hyperfine constants) to be refined. Description: Author Institution: Department of Physics, University of Wisconsin-La Crosse, La Crosse, WI 54601; Instituto de Ciencias Nucleares, UNAM, Mexico, D.F.; Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, OX1 3QZ, United Kingdom URI: http://hdl.handle.net/1811/30918 Other Identifiers: 2006-MJ-03