Fluorescence lifetime studies of NO2. IV. Temperature dependence of fluorescence spectra and of collisional quenching of fluorescence

1980 ◽  
Vol 73 (4) ◽  
pp. 1514-1520 ◽  
Author(s):  
D. G. Keil ◽  
V. M. Donnelly ◽  
F. Kaufman
Keyword(s):  
Temperature Dependence ◽  
Fluorescence Lifetime ◽  
Fluorescence Spectra ◽  
Collisional Quenching ◽  
Quenching Of Fluorescence ◽  
Lifetime Studies

Specific features of the temperature dependence of tryptophan fluorescence lifetime in the temperature range of −170–20 °C

2020 ◽  
Vol 393 ◽  
pp. 112435
Author(s):  
Peter P. Knox ◽  
Vladimir V. Gorokhov ◽  
Boris N. Korvatovsky ◽  
Nadezhda P. Grishanova ◽  
Sergey N. Goryachev ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Fluorescence Lifetime ◽  
Tryptophan Fluorescence ◽  
Temperature Range

Temperature Dependence of Tryptophan Fluorescence Lifetime as an Indicator of Its Microenvironment Dynamics

2021 ◽  
Vol 498 (1) ◽  
pp. 170-176
Author(s):  
V. V. Gorokhov ◽  
B. N. Korvatovsky ◽  
P. P. Knox ◽  
N. P. Grishanova ◽  
S. N. Goryachev ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Fluorescence Lifetime ◽  
Tryptophan Fluorescence

Effect of ring substituents on the fluorescence spectra of substituted diarylcarbenes

1988 ◽  
Vol 66 (3) ◽  
pp. 491-494 ◽  
Author(s):  
J. C. Scaiano ◽  
D. Weir
Keyword(s):  
Free Radical ◽  
Temperature Dependence ◽  
Fluorescence Spectra ◽  
Excellent Correlation ◽  
Emission Data ◽  
The Difference

The fluorescence spectra of a series of ring-substituted diarylcarbenes have been examined. The solution spectra are generally red shifted by 25–30 nm with respect to the band positions in matrices at 77 K. The difference is believed to reflect emission from non-relaxed conformations at 77 K. Both electron-withdrawing and -donating substituents lead to red shifts in the emission. These shifts are essentially additive, and the carbene emission data show an excellent correlation with free radical fluorescence data for the corresponding diarylmethyl radicals. The temperature dependence of excited carbene lifetimes have been examined for a few representative examples.

scholarly journals Radiative and non-radiative transitions of excited Ti3+ cations in sapphire

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Avry Shirakov ◽  
Zeev Burshtein ◽  
Yehoshua Shimony ◽  
Eugene Frumker ◽  
Amiel A. Ishaaya
Keyword(s):  
Temperature Dependence ◽  
Electronic State ◽  
Fluorescence Lifetime ◽  
Radiative Lifetime ◽  
Radiative Transition ◽  
Zero Temperature ◽  
Thermal Phonon ◽  
Radiative Transitions ◽  
Thermal Enhancement ◽  
Radiative Transition Rate

AbstractWe have measured the fluorescence quantum efficiency in Ti3+:sapphire single crystals between 150 K and 550 K. Using literature-given effective fluorescence lifetime temperature dependence, we show that the zero temperature radiative lifetime is (4.44 ± 0.04) μs, compared to the 3.85 μs of the fluorescence lifetime. Fluorescence lifetime thermal shortening resolves into two parallel effects: radiative lifetime shortening, and non-radiative transition rate enhancement. The first is due to thermally enhanced occupation of a ΔE = 1,700 cm−1 higher (top) electronic state of the upper multiplet, exhibiting a transition oscillator strength of f = 0.62, compared to only 0.013 of the bottom electronic state of the same multiplet. The non-radiative rate relates to multi-phonon decay transitions stimulated by the thermal phonon occupation. Thermal enhancement of the configuration potential anharmonicity is also observed. An empiric expression for the figure-of-anharmonicity temperature dependence is given as $$\hat{{\bf{H}}}$$Hˆ (T) = $$\hat{{\bf{H}}}$$Hˆ (0)(1 + β exp(−ℏωco /kBT )), where $$\hat{{\bf{H}}}$$Hˆ (0) = 0.276, β = 5.2, ℏωco = 908 cm−1, and kB is the Boltzmann constant.

Multiphoton imaging and fluorescence lifetime studies on unstained cells and tissue at cryogenic conditions

2007 ◽  
Author(s):  
Martin Stark ◽  
Daniel Dörr ◽  
Alexander Ehlers ◽  
Daniel Sauer ◽  
Rainer Bückle ◽  
...  
Keyword(s):  
Fluorescence Lifetime ◽  
Multiphoton Imaging ◽  
Lifetime Studies ◽  
Cryogenic Conditions

scholarly journals Temperature dependence of Ti:Sapphire fluorescence spectra for the design of cryogenic cooled Ti:Sapphire CPA laser

2017 ◽  
Vol 25 (6) ◽  
pp. 6954 ◽  
Author(s):  
Harry Burton ◽  
Christopher Debardelaben ◽  
Wafa Amir ◽  
Thomas A. Planchon
Keyword(s):  
Temperature Dependence ◽  
Fluorescence Spectra
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