M. Becucci et al., HIGH-RESOLUTION OPTOTHERMAL SPECTROSCOPY OF PYRIDINE IN THE S-1 STATE, The Journal of chemical physics, 107(24), 1997, pp. 10399-10405
The optothermal technique has been utilized to obtain the first high r
esolution spectrum of pyridine in the region of the S-1<--S-0 electron
ic transition. Rotational profiles for several vibronic bands (0(0)(0)
, 6a(0)(1), 16b(0)(2)6a(0)(1), 6a(0)(2), 12(0)(1)) were measured and f
ound to be severely homogeneously broadened with linewidths of the ord
er of 3-5 GHz, in agreement with previous lifetime measurements. Rotat
ional constants of pyridine in the excited S-1 vibronic levels were ex
tracted by a band contour analysis. The values obtained are in good ag
reement with results from ab initio calculations, also presented here.
(C) 1997 American Institute of Physics.