Analysis of photoacoustic waveforms using the nonlinear least squares method

Small, Jeanne Rudzki; Libertini, Louis J.; Small, Enoch W.

doi:10.1016/0301-4622(92)80005-p

Cited by 129 publications

(50 citation statements)

References 20 publications

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“…Analysis of the photothermal signal was performed by means of two methods proposed by Marti et al [15] and by Small et al [16]. The Marti et al [15] method is based on comparison of the maximal amplitudes (H max ) of the LIOAS signal (describe by Eq.…”

Section: Resultsmentioning

confidence: 99%

Spectral Properties and Deactivation Processes of Anionic Porphyrin Coupled with TiO2 Nanostructure

et al. 2009

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Meso-tetrakis (4-sulphonatophenyl)porphyrin (TSPP) and its complex with TiO 2 were studied by absorption, fluorescence, and steady-state and time-resolved photothermal spectroscopy. A TiO 2 -TSPP complex was obtained by covalent bonding of anionic porphyrin with the nanostructural form of TiO 2 . The TiO 2 colloidal carriers modifying the thermal energy distribution and considerably influencing the photophysical processes were found to lead to changes in the population of the porphyrin singlet and triplet states, resulting in singlet oxygen generation and/or electron transfer.

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Section: Resultsmentioning

confidence: 99%

Spectral Properties and Deactivation Processes of Anionic Porphyrin Coupled with TiO2 Nanostructure

et al. 2009

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“…For instance, in a system where one or more of such processes occur, the signal obtained will be a convoluted waveform that will appear phase shifted and reduced in amplitude due to the presence of components corresponding to slower reactions. Using a deconvolution analysis for the time dependence of the signal S, the magnitude of each of the signal-inducing events as well as their lifetimes will be obtained [35]. This is the basis of time-resolved photoacoustic calorimetry (TR-PAC).…”

Section: Photoacoustic Calorimetrymentioning

confidence: 99%

Time‐resolved photoacoustic calorimetry as a tool to determine rate constants of hydrogen‐abstraction reactions

Nunes¹,

Correia²,

Santos³

et al. 2006

Int J of Chemical Kinetics

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The hydrogen-abstraction reaction from phenol by tert-butoxyl radical was used to test time-resolved photoacoustic calorimetry (TR-PAC) as a method to obtain kinetic data. Absolute rate constants for this reaction were determined in benzene and in the 298-312 K temperature range, using a temperature-controlled photoacoustic calorimeter, yielding an average value of 3.5 × 10 8 M −1 s −1 . This is in good agreement with the literature results obtained by laser flash photolysis (LFP). Kinetic solvent effects (KSE) in the same reaction were also studied using acetonitrile, carbon tetrachloride, and ethyl acetate as solvents. The results obtained by TR-PAC are close to those derived by LFP (using the cumyloxyl radical as the abstracting species) and follow the expected trend based on the KSE.

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“…Pulsed photoacoustic spectroscopy can provide a direct measurement of thermodynamic parameters such as volume change and enthalpy changes that accompany electron transfer reactions (Braslavsky, 1985;Carpentier et al, 1990;Arnaut et al, 1992;Small et al, 1992;Losi et al, 1995;Edens et al, 2000;Malkin, 2000;Herbert et al, 2001;Feitelson and Mauzerall, 2002;Delosme, 2003;Hou and Mauzerall, 2006;Hou and Sakmar, 2010;Hou and Mauzerall, 2011). With prior knowledge of the change in Gibbs free energy of the corresponding reactions, the apparent entropy change (TS) of the reaction can be calculated.…”

Section: Thermodynamics Of Mena and Menb Null Mutantsmentioning

confidence: 99%

Probing the Thermodynamics of Photosystem I by Spectroscopic and Mutagenic Methods

Hou¹,

Hou²

2012

Thermodynamics - Fundamentals and Its Application in Science

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Analysis of photoacoustic waveforms using the nonlinear least squares method

Cited by 129 publications

References 20 publications

Spectral Properties and Deactivation Processes of Anionic Porphyrin Coupled with TiO2 Nanostructure

Spectral Properties and Deactivation Processes of Anionic Porphyrin Coupled with TiO2 Nanostructure

Time‐resolved photoacoustic calorimetry as a tool to determine rate constants of hydrogen‐abstraction reactions

Probing the Thermodynamics of Photosystem I by Spectroscopic and Mutagenic Methods

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