The 3410 A band of the PH molecule in the solar photospheric spectrum

Physics

Scientific paper

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Molecular Spectra, Phosphorus Compounds, Photosphere, Solar Spectra, Ultraviolet Spectra, Hydrogen Compounds, Line Spectra, Molecular Rotation, Oscillator Strengths

Scientific paper

Some weak unidentified solar photospheric lines in the wavelength range: (3400 - 3465) Å may be due to PH lines of the (0, 0) band of the PH(A3Πi - X3Σ-) system. These faint PH molecular lines have resulted an excitation temperature of the order of 4500K. Using experimental lifetime data for PH in the A3Πi state, an absorption oscillator strength f00 = 0.0075 is derived for the 3410 Å band of the PH (A3Πi - X3Σ-) system. Accurate line positions, oscillator strength and transition probability for the 4.4 μ fundamental rotation-vibration band of the PH molecule are obtained. A comparison of positions of some lines of the 4.4 μ band with those obtained on new tracings of high resolution solar spectra shows many coincidences with weak solar lines.

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