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 arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/4722
ISSN:	0030-4018
Alternative Location:	http://dx.doi.org/10.1016/S0030-4018(01)01173-7 http://adsabs.harvard.edu/abs/2001OptCo.192..123R
Copyright:	2001 Elsevier
Appears in Collections:	Research Papers (LAMP)

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