On photoproduction of ultraviolet emission lines

Details On photoproduction of ultraviolet emission lines On photoproduction of ultraviolet emission lines

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..549f&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, June 1986, p. 549-551.

Astronomy and Astrophysics

Astronomy

3

Emission Spectra, Line Spectra, Nebulae, Photoionization, Ultraviolet Astronomy, Atomic Excitations, Ground State, H Ii Regions, Ionization Frequencies

Scientific paper

In this note, it is pointed out that removal of inner electrons by photoionization can produce ultraviolet emission lines of observable intensity. In the case of C(+) + h(nu) = more than C(2+) + e, ionization by photons with energies greater than 31 eV produces ions which then preferentially populate the excited C III 3P state. Calculations show that photoproduction of lines such as C III 1909 A can be competitive with collisional excitation in low-temperature, low-ionization nebulae such as H II regions, and could affect abundance or ionization studies. In general, this production mechanism should be considered whenever the ultraviolet lines have intensities a few tens of percent of H-beta.

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