Measurement of the quantum yield for intersystem crossing to the triplet state from flash response curves

1975 ◽  
Vol 23 (5) ◽  
pp. 1481-1483
Author(s):  
V. L. Pugachev ◽  
A. K. Chibisov
Keyword(s):  
Quantum Yield ◽  
Triplet State ◽  
Intersystem Crossing ◽  
Response Curves ◽  
Flash Response

Photolysis of ketene. I

1968 ◽  
Vol 46 (14) ◽  
pp. 2353-2360 ◽  
Author(s):  
A. N. Strachan ◽  
D. E. Thornton
Keyword(s):  
Carbon Monoxide ◽  
Quantum Yield ◽  
Triplet State ◽  
Singlet State ◽  
Inert Gases ◽  
Inert Gas ◽  
Excited Singlet State ◽  
Intersystem Crossing ◽  
Excited Singlet ◽  
Increasing Temperature

Ketene has been photolyzed at 3660 and 3130 Å both alone and in the presence of the inert gases C4F8 and SF6. The quantum yield of carbon monoxide has been determined at both wavelengths as a function of pressure and temperature. At 3660 Å the quantum yield decreases with increasing pressure but increases with increasing temperature. At 3130 Å the quantum yield with ketene alone remains 2.0 at both 37 and 100 °C at pressures up to 250 mm. At higher pressures of ketene or with added inert gas the quantum yield decreases with increasing pressure. The results are interpreted in terms of a mechanism in which intersystem crossing from the excited singlet state to the triplet state occurs at both wavelengths, and collisional deactivation of the excited singlet state by ketene is single stage at 3660 Å but multistage at 3130 Å.

Identification of a receiver triplet state in the ultrafast intersystem crossing of carbonylpyrenes

2020 ◽  
Vol 22 (11) ◽  
pp. 6145-6153
Author(s):  
Lekshmi R. S. ◽  
Gayathri B. Kurup ◽  
Sivaranjana Reddy Vennapusa
Keyword(s):  
Quantum Yield ◽  
Triplet State ◽  
Intersystem Crossing

The intersystem crossing receiver triplet state lifetime dictates the efficiency of the triplet quantum yield in carbonylpyrenes.

scholarly journals Effects of Molecular Vibration and Rotation on Intramolecular Dynamics in S1 of s-Triazine Vapor

1989 ◽  
Vol 10 (2) ◽  
pp. 109-138 ◽  
Author(s):  
Nobuhiro Ohta
Keyword(s):  
Quantum Yield ◽  
Triplet State ◽  
Slow Component ◽  
Rotational Level ◽  
Molecular Vibration ◽  
Intersystem Crossing ◽  
Collisional Quenching ◽  
Intramolecular Dynamics ◽  
Low Pressures ◽  
Vibronic Level

Emission properties of s-triazine vapor have been examined for excitation into various vibronic levels of S1. The emission involves broad fluorescence besides the sharp fluorescence emitted from the initially prepared vibronic level (IPL). At low pressures, the IPL fluorescence exhibits a biexponential decay composed of fast and slowly decaying portions, and the broad fluorescence also consists of fast and slow components with lifetimes comparable to those of the IPL fluorescence. The broad fluorescence exhibits another slow component, which is characterized by a less tendency to undergo collisional quenching. The emitting levels of the broad fluorescence are regarded as reached directly from the IPL and indirectly via triplet state. The quantum yield of the slow component of the IPL fluorescence remarkably depends on the rotational level excited, whereas the quantum yield of the broad fluorescence is nearly independent of the rotational level excited. These results suggest that K scrambling occurs not only in the intersystem crossing between singlet and triplet levels but also in the relaxation to other singlet levels from the IPL.

Intersystem crossing via charge recombination in a perylene–naphthalimide compact electron donor/acceptor dyad

2020 ◽  
Vol 8 (24) ◽  
pp. 8305-8319
Author(s):  
Muhammad Imran ◽  
Ahmed M. El-Zohry ◽  
Clemens Matt ◽  
Maria Taddei ◽  
Sandra Doria ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Triplet State ◽  
Singlet Oxygen ◽  
Electron Donor ◽  
Charge Recombination ◽  
Intersystem Crossing ◽  
Donor Acceptor ◽  
State Production

Efficient triplet state production (singlet oxygen quantum yield: 80%) by SOCT-ISC was observed for a perylene–naphthalimide compact electron donor/acceptor dyad.

scholarly journals Twisted Bodipy Derivative: Intersystem Crossing, Electron Spin Polarization and Application As a Novel Photodynamic Therapy Reagent

2021 ◽  
Author(s):  
Yu Dong ◽  
Prashant Kumar ◽  
Partha Maity ◽  
Ivan Kurganskii ◽  
Shujing Li ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Triplet State ◽  
Spin Polarization ◽  
Electron Spin ◽  
Photophysical Properties ◽  
Heavy Atom ◽  
Electron Spin Polarization ◽  
Intersystem Crossing

The photophysical properties of a heavy atom-free Bodipy derivative with twisted π-conjugation framework were studied. Efficient intersystem crossing (ISC. Quantum yield: 56%) and exceptionally long-lived triplet state wereobserved (4.5 ms....

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