Other
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.263..485d&link_type=abstract
Nature, vol. 263, Oct. 7, 1976, p. 485, 486. Research supported by the National Research Council of Canada.
Other
1
Cosmic Dust, Electron Transitions, Interstellar Matter, Line Spectra, Metal Ions, Microwave Spectra, Absorption Spectra, Atomic Spectra, Chromium, Ground State, Hydrogen Atoms, Ionized Gases, Iron, Millimeter Waves, Nonthermal Radiation, Spectral Energy Distribution, Transition Metals
Scientific paper
It is suggested that relatively sharp spectral lines at millimeter and centimeter wavelengths may arise from neutral or ionized atomic species in interstellar dust. Frequencies at which the F = 0 - F = 1 ground-state hyperfine transition of atomic hydrogen occurs in various solids are listed, and the column density required to yield measurable absorption is estimated. Zero-field splitting of the ground state of Fe(3+) and Cr(3+) in different crystals is examined, and the frequency range at which magnetic dipole transitions between the zero-field levels occur is shown to be 6 to 80 GHz. It is concluded that transitions between zero-field levels of Fe(3+) and other transition-metal ions in interstellar dust may be observable in absorption in typical interstellar dust clouds. It is noted that nonthermal emission at the frequencies of the absorption features considered is also a distinct possibility.
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