2 January 1995 Saturation Raman spectroscopy of the excited states of metalloporphyrins
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Proceedings Volume 2370, 5th International Conference on Laser Applications in Life Sciences; (1995) https://doi.org/10.1117/12.197442
Event: Laser Applications in Life Sciences: 5th International Conference, 1994, Minsk, Belarus
Abstract
The application is discussed of saturation resonance Raman technique with nanosecond lasers both in spontaneous and coherent regimes to the investigations of the excited states of metalloporphyrins. It is shown that saturation technique enables us to obtain new information about transient states, additional to the data of direct kinetic measurements. For nickel octaethylporphyrin (OEP) complex, we present spectroscopic evidences for the population of the higher excited electronic state, presumably of the 1B1g origin. For CuOEP dissolved in a number of oxygen (O)-containing solvents, the existence of fast channel of relaxation via the excited charge-transfer (CT) state is also proven on the basis of saturation Raman data. To explain the observed transformations in transient Raman spectra under variation of excitation power, simulations of the population redistribution processes in both systems are performed using quasi-stationary rate equations approach. The advantages of resonance coherent anti-Stokes Raman scattering (RCARS) over spontaneous resonance Raman (RR) spectroscopy is proven unambiguously in such type of investigations.
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Sergei G. Kruglik, Pavel A. Apanasevich, Vladimir V. Kvach, Valentin A. Orlovich, "Saturation Raman spectroscopy of the excited states of metalloporphyrins", Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995); doi: 10.1117/12.197442; https://doi.org/10.1117/12.197442
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