@article{2041-8205-778-1-L1,
  author={H. Gupta and C. A. Gottlieb and V. Lattanzi and J. C. Pearson and M. C. McCarthy},
  title={Laboratory Measurements and Tentative Astronomical Identification of H2NCO+},
  journal={The Astrophysical Journal Letters},
  volume={778},
  number={1},
  pages={L1},
  url={http://stacks.iop.org/2041-8205/778/i=1/a=L1},
  year={2013},
  abstract={The rotational spectrum of H 2 NCO + , the ground-state isomer of protonated HNCO, has been measured in a molecular beam in the centimeter band with a Fourier transform microwave spectrometer and in a low-pressure laboratory discharge in absorption in the millimeter band. Spectroscopic constants, including the nitrogen-14 hyperfine coupling constant, derived from 30 a -type transitions between 20 and 367 GHz with J ≤ 18 and K a ≤ 3 allow the principal rotational transitions to be calculated to 1 km s –1 or better in equivalent radial velocity well into the far IR. Two low-lying rotational transitions of H 2 NCO + in the centimeter band (0 0, 0 -1 0, 1 and 1 1, 0 -2 1, 1 ) were tentatively identified in absorption in the PRIMOS spectral line survey of Sgr B2(N) with the Green Bank Telescope. The lines of H 2 NCO + arise in a region of the Sgr B2(N) halo whose density is low ( n < 1 × 10 4 cm –3 ). The derived column density of (6-14) × 10 11 cm –2 implies that the fractional abundance is ~10 –12 . Owing to the ubiquity of HNCO in galactic molecular clouds, H 2 NCO + is a good candidate for detection in sources spanning a wide range of physical conditions.}
}