Energy transfer and fine structure axes determination in a hybrid porphyrin dimer oriented in a liquid crystal. Time resolved triplet EPR spectroscopy

1986 ◽  
Vol 84 (8) ◽  
pp. 4132-4141 ◽  
Author(s):  
Oded Gonen ◽  
Haim Levanon
Keyword(s):  
Energy Transfer ◽  
Fine Structure ◽  
Liquid Crystal ◽  
Epr Spectroscopy ◽  
Time Resolved ◽  
Porphyrin Dimer

Intramolecular Electron and Energy Transfer in an Axial ZnP−Pyridylfullerene Complex As Studied by X- and W-Band Time-Resolved EPR Spectroscopy

2005 ◽  
Vol 109 (38) ◽  
pp. 8451-8458 ◽  
Author(s):  
Tamar Galili ◽  
Ayelet Regev ◽  
Alexander Berg ◽  
Haim Levanon ◽  
David I. Schuster ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Epr Spectroscopy ◽  
Time Resolved ◽  
W Band

scholarly journals Time-Resolved Measurements and Master Equation Modelling of the Unimolecular Decomposition of CH3OCH2

2020 ◽  
Vol 234 (7-9) ◽  
pp. 1233-1250 ◽  
Author(s):  
Arrke J. Eskola ◽  
Mark A. Blitz ◽  
Michael J. Pilling ◽  
Paul W. Seakins ◽  
Robin J. Shannon
Keyword(s):  
Energy Transfer ◽  
Master Equation ◽  
Rate Coefficient ◽  
Zero Point ◽  
Buffer Gas ◽  
Unimolecular Decomposition ◽  
Time Resolved ◽  
Point Energy ◽  
Wide Range ◽  
Transfer Parameters

AbstractThe rate coefficient for the unimolecular decomposition of CH3OCH2, k1, has been measured in time-resolved experiments by monitoring the HCHO product. CH3OCH2 was rapidly and cleanly generated by 248 nm excimer photolysis of oxalyl chloride, (ClCO)2, in an excess of CH3OCH3, and an excimer pumped dye laser tuned to 353.16 nm was used to probe HCHO via laser induced fluorescence. k1(T,p) was measured over the ranges: 573–673 K and 0.1–4.3 × 1018 molecule cm−3 with a helium bath gas. In addition, some experiments were carried out with nitrogen as the bath gas. Ab initio calculations on CH3OCH2 decomposition were carried out and a transition-state for decomposition to CH3 and H2CO was identified. This information was used in a master equation rate calculation, using the MESMER code, where the zero-point-energy corrected barrier to reaction, ΔE0,1, and the energy transfer parameters, ⟨ΔEdown⟩ × Tn, were the adjusted parameters to best fit the experimental data, with helium as the buffer gas. The data were combined with earlier measurements by Loucks and Laidler (Can J. Chem.1967, 45, 2767), with dimethyl ether as the third body, reinterpreted using current literature for the rate coefficient for recombination of CH3OCH2. This analysis returned ΔE0,1 = (112.3 ± 0.6) kJ mol−1, and leads to $k_{1}^{\infty}(T)=2.9\times{10^{12}}$ (T/300)2.5 exp(−106.8 kJ mol−1/RT). Using this model, limited experiments with nitrogen as the bath gas allowed N2 energy transfer parameters to be identified and then further MESMER simulations were carried out, where N2 was the buffer gas, to generate k1(T,p) over a wide range of conditions: 300–1000 K and N2 = 1012–1025 molecule cm−3. The resulting k1(T,p) has been parameterized using a Troe-expression, so that they can be readily be incorporated into combustion models. In addition, k1(T,p) has been parametrized using PLOG for the buffer gases, He, CH3OCH3 and N2.

Submicrosecond studies in pulse radiolysis by time-resolved EPR spectroscopy

1975 ◽  
Vol 35 (4) ◽  
pp. 566-568 ◽  
Author(s):  
A.D. Trifunac ◽  
K.W. Johnson ◽  
B.E. Clifft ◽  
R.H. Lowers
Keyword(s):  
Epr Spectroscopy ◽  
Pulse Radiolysis ◽  
Time Resolved
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