Abstract
Empirical values of solar damping constants and their variation with optical depth were derived according to a method developed earlier by the authors. The damping constants refer to six infrared multiplets (24 lines). The average optical depths range from τ0 = 0.5 to 2.2. Corresponding theoretical damping constants were computed, mainly on the basis of Van der Waals damping, and with the help of detailed computations of the mean square radii of the atomic levels by Van Rensbergen. The empirical values are systematically larger than the theoretical ones, with factors ranging between 1.8 and 4.9. Some speculations about the source of this discrepancy are given.
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De Jager, C., Neven, L. Damping constants for infrared fraunhofer lines. Sol Phys 11, 3–10 (1970). https://doi.org/10.1007/BF00156541
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DOI: https://doi.org/10.1007/BF00156541