Abstract
Frequency measurements are given for the band of near 4.5 μm and for pure rotational transitions beyond 151.5 μm. The infrared measurements utilize a periodically poled lithium niobate (PPLN) based difference frequency generation (DFG) source locked to the saturated absorption center of an absorption line. The DFG frequency is calibrated by an optical frequency comb and an iodine hyperfine transition. We report 44 transitions ranging from for both the and branches and the accuracy is better than 10 kHz for most transitions. In addition, 175 pure rotational transitions have been measured including 33 measurements with sub-Doppler precision (), and 142 Doppler limited measurements. These are combined with other precision rotational and vibrational measurements to provide improved quantum mechanical parameters, as well as frequency calibration tables for the bands near 4.5 μm.
© 2014 Optical Society of America
Full Article | PDF ArticleMore Like This
J. S. Wells, D. A. Jennings, A. Hinz, J. S. Murray, and A. G. Maki
J. Opt. Soc. Am. B 2(5) 857-861 (1985)
Kevin Knabe, Paul A. Williams, Fabrizio R. Giorgetta, Michael B. Radunsky, Chris M. Armacost, Sam Crivello, and Nathan R. Newbury
Opt. Express 21(1) 1020-1029 (2013)
Chun-Chieh Liao, Yu-Hung Lien, Kuo-Yu Wu, Yan-Rung Lin, and Jow-Tsong Shy
Opt. Express 21(8) 9238-9246 (2013)