Abstract
The rotational line intensity, partial band intensity and peak band intensity methods (the latter used in conjunction with computer-generated synthetic spectra) have been used to interpret photoelectric and photographic measurements on the astrophysically important C
2
Swan band system, stably excited in a direct current discharge through C
2
CI
6
+ A. All measurements lead to a consistent (within 5% ) expression for the variation of the electronic transition moment with internuclear separation of
R
e
(r)
=
C
(1.00-0.25r) 1.120 <
r
< 1.488
A
. Critical assessment of recently published oscillator strength measurements on the (0,0) band suggest that
C
is 13.02 x 10
-18
cm e.s.u. ( ± 25 %). A table of absolute band strengths, oscillator strengths and Einstein A coefficients has thus been calculated.
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