Time-resolved resonance Raman spectra of free-base octaethylporphyrin in the S1 and T1 states

✍ Scribed by Shin-ichiro Sato; Motoko Asano-Someda; Teizo Kitagawa

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 436 KB
• Volume: 189
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)85229-4

✦ Synopsis

Pump/probe time-resolved resonance Raman experiments were carried out for free-base octaetbylporphyrin in benzene at room temperature by using two Nd: YAG lasers, and the vibrational spectra of its lowest excited singlet and triplet states were observed. The spectrum of the S, state of OEPHz pumped by the 532 nm pulse closely resembled that obtained by pumping it to the Sz state, confirming the fast relaxation from Sz to S,. The v., band was shifted down by 23 cm-' in S, compared to the So state, but its location in the T, state could not be determined. The highest-frequency skeletal stretching mode was also shifted down by 15 cm-' upon excitation to S,, but it shifted up by 5 cm-' upon intersystem crossing to the T, state.