Abstract:
The near ultraviolet absorption of phosgene has
been assigned to a * 1 1 ~.--n, A;-- Al electronic
transition from vapour phase spectra recorded
under conditions of high resolution and low_t~mperature.
Progressions in Vi, v2' V3' V4 and
V4 ha\1e been identified in the spectrum and have
been analyzed in terms of vibronic transitions
between a planar ground and a nonplanar excited
state. A ba~rier height of 3170 cm~l:and a nona
planar equilibrium angle of 32.5 were calculated
for the upper state from a fit of the energy
levels of a Lorentzian-guadratic potential func-
~ion to the observed levels of V
4
. ' ~he false ori-
3in, 41
0
, of the spectrum has been assigned to the
band at 33,631 cm -1 . An oscillator strength of
-3 1 . 1
f = 1. a x 10 has been obtained for the A - A
2 1
transition.
