Absolute transition probabilities in Ni I

Recent Progress in Studies of Atomic Spectra and Transition Probabilities by Beam-foil Spectroscopy

“…Notable differences from Warner's [82] results for Ti I1 and V I1 were found, and this fact may necessitate a substantial increase of the presently adopted photospheric abundances of these elements. Also for Cr I and Ni I radiative lifetimes have been measured in this way, by Cocke et al [86], Brand et al [87], and Lennard et al [88]. Preliminary values for lifetimes in Cr I, Cr 11, Mn I, Mn 11, Mn 111, CO I and CO I11 have been presented by Pinnington et al [89], whereas Martinson et al [go] reported lifetimes for a number of Mn I and Mn I1 terms.…”

Excitation of 3 F o levels of nickel atom by collisions with slow electrons

“…However, an analysis of the situation for several atoms and ions indicates [11,12] that the discrepancies between data of different researchers can be unacceptably large. For the discussed transitions from 3 F o -levels of the Ni atom (we will limit the discussion to the two levels studied before [7]), Table 2 illustrates the situation in which intensities from a handbook [13] and branching ratios BR [7] are also included. Also, tables with splitting of lines according to elements are also given [13, Table 1] in addition to a general table of wavelengths for all elements [13, Table 2] although the scale I in them is not the same.…”

“…Oscillator strengths for 888 lines of NiI were determined based on this same experiment [6]. Somewhat later radiation lifetimes for eight energy levels of Ni atom were measured by the beam-foil method [7]. Also, branching ratios for transitions from six levels were measured and transition probabilities for 50 lines of NiI were determined.…”