Hyperfine Induced Transitions as Probes of Low Density Plasmas

Details Hyperfine Induced Transitions as Probes of Low Density Plasmas Hyperfine Induced Transitions as Probes of Low Density Plasmas

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7300b&link_type=abstract

HST Proposal ID #7300

Physics

Hst Proposal Id #7300 Stellar Ejecta

Scientific paper

Hyperfine induced {HPF} transitions in ^13C, ^29Si, and N may provide a sensitive density diagnostic for low density plasmas, as well as a way to measure carbon and silicon isotope ratios. As it is impossible to measure such small transition probabilites in laboratory sources, we propose to detect the HPF line of N IV, Lambda1483.32 Angstrom, in the low density planetary nebulae NGC 3918. Sucessful detection of this line would verify the predictions of atomic theory, and when combined with a previous non-detection of the ^13C III HPF line {Lambda1906.7 Angstrom} in this source, would yield an upper limit to the ^13C/^12C ratio.

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