The optothermal technique has been utilized to obtain the first high resolution spectrum of pyridine in the region of the S-1<--S-0 electronic 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 found to be severely homogeneously broadened with linewidths of the order of 3-5 GHz, in agreement with previous lifetime measurements. Rotational constants of pyridine in the excited S-1 vibronic levels were extracted by a band contour analysis. The values obtained are in good agreement with results from ab initio calculations, also presented here.
High resolution opthotermal spectroscopy of pyridine in the S1 state / M. BECUCCI; N. M. LAKIN; G. PIETRAPERZIA; P. R. SALVI; E. CASTELLUCCI; E. R. TH. KERSTEL. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - STAMPA. - 107:(1997), pp. 10399-10405. [10.1063/1.474203]
High resolution opthotermal spectroscopy of pyridine in the S1 state
BECUCCI, MAURIZIO;PIETRAPERZIA, GIANGAETANO;SALVI, PIER REMIGIO;CASTELLUCCI, EMILIO MARIO;
1997
Abstract
The optothermal technique has been utilized to obtain the first high resolution spectrum of pyridine in the region of the S-1<--S-0 electronic 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 found to be severely homogeneously broadened with linewidths of the order of 3-5 GHz, in agreement with previous lifetime measurements. Rotational constants of pyridine in the excited S-1 vibronic levels were extracted by a band contour analysis. The values obtained are in good agreement with results from ab initio calculations, also presented here.
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