Mechanism of Photosensitized Generation of Singlet Oxygen during Oxygen Quenching of Triplet States and the General Dependence of the Rate Constants and Efficiencies of O2(1Σg+), O2(1Δg), and O2(3Σg-) Formation on Sensitizer Triplet State Energy and Oxidation Potential

2003 ◽  
Vol 107 (13) ◽  
pp. 2192-2198 ◽  
Author(s):  
Claude Schweitzer ◽  
Zahra Mehrdad ◽  
Astrid Noll ◽  
Erich-Walter Grabner ◽  
Reinhard Schmidt
Keyword(s):  
Triplet State ◽  
Singlet Oxygen ◽  
Rate Constants ◽  
State Energy ◽  
Oxidation Potential ◽  
Triplet States ◽  
Oxygen Quenching ◽  
Triplet State Energy

Room temperature phosphorimetric determination of cyanide based on triplet state energy transfer

2003 ◽  
Vol 491 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Marı́a Teresa Fernández-Argüelles ◽  
José M Costa-Fernández ◽  
Rosario Pereiro ◽  
Alfredo Sanz-Medel
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Room Temperature ◽  
State Energy ◽  
Triplet State Energy

Development of Luminescent Terbium(III) Chelates for Protein Labelling: Effect of triplet-state energy level

1997 ◽  
Vol 80 (2) ◽  
pp. 372-387 ◽  
Author(s):  
Harri Takalo ◽  
Veli-Matti Mukkala ◽  
Liisa Meriö ◽  
Juan Carlos Rodríguez-Ubis ◽  
Rosa Sedano ◽  
...  
Keyword(s):  
Energy Level ◽  
Triplet State ◽  
State Energy ◽  
Protein Labelling ◽  
Triplet State Energy

scholarly journals Transfer of Triplet State Energy in Fluid Solutions. IV. Determination of Triplet Yields by the Measurement of Sensitized Biacetyl Phosphorescence.

1969 ◽  
Vol 23 ◽  
pp. 2815-2829 ◽  
Author(s):  
Kjell Sandros ◽  
O. Bastiansen ◽  
Tove Motzfeldt ◽  
D. Heinegård ◽  
Alexandru T. Balaban ◽  
...  
Keyword(s):  
Triplet State ◽  
State Energy ◽  
Triplet State Energy

Optische Spin-Polarisation im Triplett-Zustand von Naphthalin

1969 ◽  
Vol 24 (6) ◽  
pp. 952-967 ◽  
Author(s):  
M. Schwöhrer ◽  
H. Slxl
Keyword(s):  
Triplet State ◽  
Spin Polarization ◽  
Rate Constants ◽  
Uv Light ◽  
Lattice Relaxation ◽  
Stimulated Emission ◽  
Spin Lattice Relaxation ◽  
Spin Component ◽  
Triplet States ◽  
Selection Rules

Naphthalene, which is excited into the lowest triplet state by unpolarized UV-Iight shows a strong deviation from the Boltzman distribution within the three magnetic sublevels, which is ob­served by ESR. We call this deviation optical spin polarization. In the mixed crystal C10D8: 0.2% C10H8 , where the undeuterated Naphthalene acts as trap at 4.2 °K, the optical spin polarization exceeds the thermal spin polarization such that a steady state inversion between two of the mag­netic sublevels appears. This results in an emissive ESR-transition (stimulated emission of micro- waves). The time dependence of the spin polarization after switching on or off the UV-light is described by a superposition of two exponential functions with different rate constants. - The optical spin polarization is due to spin selection rules for the intersystem crossing process (ISC). These involve primarily the molecular symmetry. - The experimental results of the present paper are these selection rules for the pumping processes: The metastable triplet state is populated via the spin component τx.The depopulation rate constants of the three spin components τx, τv and τz are kx = 0.65 sec-1, ky=0.4 sec-1 and kz=O.15 sec-1 .The spin lattice relaxation probabilities are of the order of 1 sec-1. The latter are dependent on the direction of the magnetic field and on the concentration of the populated triplet states. - These results are compared with a theory of ISC.

Sign in / Sign up

Export Citation Format

Share Document