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Title: Excited state dynamics in tetra tolyl porphyrins studied using degenerate four wave mixing with incoherent light and ps pulses
Authors: Rao, S.V.
Naga Srinivas, N.K.M
Rao, D.N.
Giribabu, L.
Maiya, B.G.
Philip, Reji
Kumar, G.R.
Issue Date: May-2001
Publisher: Elsevier
Citation: Optics Communications, 2001, Vol192, p123-133
Abstract: We present our experimental results on the excited state dynamics in several tetra tolyl porphyrins (with different central metal-ions) studied using degenerate four wave mixing with nanosecond incoherent light (DFWM-IL) and picosecond time-resolved four wave mixing (DFWM-PS). Incoherent light studies indicate three lifetimes, which have been attributed to different excited states. The shortest component with a decay constant of /<170 fs is due to the vibrational relaxation in the higher excited singlet states Sn(T2), 3-6 ps component is due to the vibrational relaxation of the Franck-Condon states in S1(τvib), and the long component of 20-100 ps is due to the population relaxation (T1) from S1 to S0. The population relaxation times obtained from time-resolved DFWM studies using a picosecond laser substantiates these results.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0030-4018
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Copyright: 2001 Elsevier
Appears in Collections:Research Papers (LAMP)

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