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Tan (1, Michael J. Butler (7), Paola Caselli (3), Shuo Kong (1), Switzerland, Takeshi Sakai (10) ((1) Dept. of Astronomy, The University of Electro-Communications, Thushara Pillai (5, University of Florida, University of Zurich, USA, USA (2) Dept. of Physics, USA (3) Max-Planck-Institute for Extraterrestrial Physics (MPE), Yoshito Shimajiri (8)","submitted_at":"2015-09-29T10:54:07Z","abstract_excerpt":"We study deuterium fractionation in two massive starless/early-stage cores C1-N and C1-S in Infrared Dark Cloud (IRDC) G028.37+00.07, first identified by Tan et al. (2013) with ALMA. Line emission from multiple transitions of $\\rm N_2H^+$ and $\\rm N_2D^+$ were observed with the ALMA, CARMA, SMA, JCMT, NRO 45m and IRAM 30m telescopes. 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