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Wurzer, A. J.; Wilhelm, T.; Piel, J.; Riedle, Eberhard ORCID: 0000-0002-2672-5718 (January 1999): Comprehensive measurement of the S-1 azulene relaxation dynamics and observation of vibrational wavepacket motion. In: Chemical Physics Letters, Vol. 299, No. 3-4: pp. 296-302
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The vibrational excess energy dependence of the internal conversion of S-1 azulene in cyclohexane was measured with 50 fs resolution. The decay time decreases from 1.7 ps For the vibrationless S-1 state to 400 fs at 1300 cm(-1). An upper limit of 2300 cm(-1) is deduced for the energetic location of the conical intersection to the S-0 state responsible for the ultrafast decay. Further increased excess energy causes biexponential decay without significant decrease in the decay times up to 5500 cm(-1). Strong oscillatory signal contributions are found due to low-frequency wavepacket motion not directly excited by the optical transition. (C) 1999 Elsevier Science B.V. All rights reserved.