Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465..473w&link_type=abstract
Astrophysical Journal v.465, p.473
Astronomy and Astrophysics
Astronomy
4
Atomic Processes, Elementary Particles, Line: Formation
Scientific paper
We calculate the intensities of the positronium de-excitation lines for two processes: (i) the radiative combination of free thermal electrons and positrons for transitions with principal quantum number n ≤ 20 and (ii) charge exchange between free positrons and hydrogen and helium atoms, restricting our evaluation to the Lyman-α line. We consider a low-density medium modeled by the case A assumption of Baker & Menzel and use the "nL method" of Pengelly to calculate the absolute intensities. We also evaluate the positronium fine and hyperfine intensities and show that these transitions are in all cases much weaker than positronium de-excitation lines in the same wavelength range. We also extrapolate our positronium de-excitation intensities to the submillimeter, millimeter, and centimeter wavelengths. Our results favor the search of infrared transitions of positronium lines for point sources when the visual extinction Av is greater than ˜5.
Chapuis C.
Durouchoux Ph.
Mahoney William A.
Wallyn Pierre
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