Hydrogen deuteride
| Hydrogen deuteride | |
|---|---|
 | |
| IUPAC name Hydrogen deuteride | |
| Systematic name (2H)Dihydrogen[citation needed] | |
| Identifiers | |
| CAS number | 13983-20-5  |
| PubChem | 167583 |
| ChemSpider | 146609 |
| EC number | 237-773-0 |
| UN number | 1049 |
| ChEBI | CHEBI:29237 |
| Jmol-3D images | {{#if:[2HH]|Image 1 |
| |
| |
| Properties | |
| Molecular formula | H[2H] |
| Molar mass | 3.02204 g mol-1 |
| Melting point | −259.0 °C; −434.2 °F; 14.1 K |
| Boiling point | −253.0 °C; −423.4 °F; 20.1 K |
| Hazards | |
| EU classification |  F+ |
| R-phrases | R12 |
| S-phrases | S16, S33, S36, S38 |
| NFPA 704 |
 4
0
0
|
| Autoignition temperature | 571 °C |
| Related compounds | |
| Related hydrogens | Deuterium |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | |
| Infobox references | |
Hydrogen deuteride is a diatomic molecule composed of the two isotopes of hydrogen: the majority isotope 1H protium and 2H deuterium. Its molecular formula is HD.
Natural abundance
Hydrogen deuteride is a minor component of naturally occurring molecular hydrogen. In particular, hydrogen deuteride 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,[1] and other sources.[citation needed]
| Planet | HD | H2[citation needed] |
|---|---|---|
| Jupiter | ~0.003% | 89.8% ±2.0% |
| Uranus | ~0.007% | 83.0% ±3.0% |
| Neptune | ~0.019% | 80.0% ±3.2% |
Radio emission spectra
HD and H2 have very similar emission spectra, but the emission frequencies differ.[2]
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.[3]
References
- ↑ Neufeld, David A.; Hollenbach, David J.; Kaufman, Michael J.; Snell, Ronald L.; Melnick, Gary J.; Bergin, Edwin A.; Sonnentrucker, Paule (2007). "SpitzerSpectral Line Mapping of Supernova Remnants. I. Basic Data and Principal Component Analysis". The Astrophysical Journal 664 (2): 890. arXiv:0704.2179. Bibcode:2007ApJ...664..890N. doi:10.1086/518857.
- ↑ Quinn, W.; Baker, J.; Latourrette, J.; Ramsey, N. (1958). "Radio-Frequency Spectra of Hydrogen Deuteride in Strong Magnetic Fields". Phys. Rev. 112 (6): 1929. Bibcode:1958PhRv..112.1929Q. doi:10.1103/PhysRev.112.1929.
- ↑ Evenson, K. M.; Jennings, D. A.; Brown, J. M.; Zink, L. R.; Leopold, K. R. (1988). "Frequency measurement of the J = 1-0 rotational transition of HD". Astrophysical Journal 330: L135. Bibcode:1988ApJ...330L.135E&db_key=AST. doi:10.1086/185221.