Hydrogen deuteride

In the laboratory it is produced by treating sodium hydride with deuterated water: : Hydrogen deuteride is a minor component of naturally occurring molecular hydrogen. It is one of the minor but noticeable components of the atmospheres of all the giant planets, with abundances from about 30 ppm to about 200 ppm. HD has also been found in supernova remnants, dense interstellar clouds, and protoplanetary disks. of a solution of HD (labeled with red bars) and (blue bar). The 1:1:1 triplet arises from the coupling of the 1H nucleus (I = 1/2) to the 2H nucleus ( I = 1). == Radio emission spectra ==

HD and H2 have very similar emission spectra, but the emission frequencies differ. The frequency of the astronomically important J = 1-0 rotational transition of HD at 2.7 THz has been measured with tunable FIR radiation with an accuracy of 150 kHz. In astronomy, this J = 1-0 line has been used to determine the masses of protoplanetary disks surrounding T Tauri stars and Herbig Ae/Be stars. == References ==