Oscillator strengths for lines of the F/0, 0, 0/-X/0, 0, 0/ band of H2O at 111.5 nanometers and the abundance of H2O in diffuse interstellar clouds

Details Oscillator strengths for lines of the F/0, 0, 0/-X/0, 0, 0/ band of H2O at 111.5 nanometers and the abundance of H2O in diffuse interstellar clouds Oscillator strengths for lines of the F/0, 0, 0/-X/0, 0, 0/ band of H2O at 111.5 nanometers and the abundance of H2O in diffuse interstellar clouds

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..166s&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 1, 1981, p. 166-174.

Astronomy and Astrophysics

Astrophysics

25

Absorption Spectra, Abundance, Electron Transitions, Interstellar Matter, Line Spectra, Transition Probabilities, Background Noise, Data Reduction, Molecular Oscillators, Spectrum Analysis, Water

Scientific paper

Absolute oscillator strengths (f-values) for rotational lines of the F˜ (0, 0, 0)-X˜(0, 0, 0) band of H2O at 111.5 nm have been measured with an uncertainty of ±40% using quantitative photographic techniques. The f-value for the 111-000 line, the one most likely to be seen in absorption in interstellar clouds, is (3.0 ± 1.2) × 10-2 This value is combined with a measured upper limit for absorption by this line in the ζ Oph cloud to show that the column density of H2O in the 000 level is less than 5.3 × 1012 cm-2. This upper limit is larger than the predictions of gas-phase, chemical models of this cloud. We show that definite detection of H2O in diffuse clouds at the level of this upper limit would be in conflict with models of molecular formation in shock-heated gas. The data analysis produced additional results: the absolute scale of the oscillator strengths for lines of the C˜(0, 0, 0)-X˜(0, 0, 0) band of H2O at 124 nm is reduced by 10%; the integrated absorption coefficients for P - and C-k bands are compared to calculated and measured values and agree within the experimental uncertainties.

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