ATOMIC TRANSITION-PROBABILITIES OF FE-II LINES DETERMINED FROM SOLAR EMISSION-SPECTRA .1. THE 2000-2800-ANGSTROM WAVELENGTH RANGE

Intensities of Fe II lines were measured at a number of positions abov e the white light limb of the quiet Sun, using photographic spectra ob tained by the Naval Research Laboratory (NRL) normal incidence spectro meter on Skylab. With the aid of experimental spontaneous decay rates previously published in the scientific literature we have calculated t he spontaneous decay rates of over 550 Fe II transitions in the 2000-2 800 angstrom wavelength range. Two-hundred twenty of the measured spon taneous decay rates are published for the first time. It was determine d that the Fe II levels in the solar chromosphere achieve a Boltzmann population corresponding to a almost-equal-to 0.78 eV temperature. The accuracy of the new rates is comparable to the accuracy of the previo usly published experimental rates.