Arrangement of the Tables
The tables are ordered by increasing ionization stage. Individual lines are
arranged in order of wavelength. Each transition is identified by its
wavelength, the energy levels of the lower (i) and
upper (k) states, the statistical weights of the levels
(g = 2J+1), and the level designations. In some cases
the designations in ASD are given with a question mark. In the present tables
we omitted these question marks because the designations were confirmed by
later calculations in references [8],
[10-19]. If an energy level was given in ASD
with a question mark to indicate that its existence is uncertain, we have
retained the question mark and have added it to the Ritz wavelength as well.
Levels whose values are noted with a +x are not connected to the main system of
levels by observed transitions. These level values were estimated by
theoretical methods so that the unknown quantity x will be minimized. All of
the present values are for electric dipole transitions, E1.
For each line, the transition probability for spontaneous emission
Aki (in units of 108 s-1), the
oscillator strength fik (dimensionless), and log
gif are given. Also, the line strength S is given in
atomic units (a.u.). For electric dipole transitions, E1, 1 a.u. =
a02e2 =
7.188 × 10-59 m2 C2, where
a0 is the Bohr radius, and e is electron charge. For
conversion factors and more details on the units, see
[6]. The power of 10 is indicated by
exponential notation (E-02 indicates 10-2). Finally, the estimated
accuracy and the references are given. The estimated accuracy is indicated by
the following letters, which are the same used in earlier NIST references
[6,7].
A - uncertainty less than 3%
B - uncertainty less than 10%
C - uncertainty less than 25%
D - uncertainty less than 50%
E - uncertainty greater than 50% |
Introduction |
Comparison |
Table Arrangement |
References