Laboratory studies of HNCO

Based on our laboratory studies of the HNCO rotational spectrum in the ground vibration state, we have increased significantly the accuracy of frequency calculations in a wide range of quantum numbers. We have achieved an 1{sigma} uncertainty for rotational transitions in the Ka=0,1 states recalculated to the Doppler velocity scale <2m/s for all frequencies <1.1THz.

This value allows radio-astronomical measurements with an accuracy comparable to that of the highest-precision observations based on spectral lines of other molecules.