Formula Used:
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Definition: The singlet lifetime given degree of exciplex formation is the time measured for the number of excited molecules to decay exponentially to N/e of the original population.
Purpose: This calculation helps in understanding the photophysical properties of molecules and their excited state behavior.
The calculator uses the formula:
Where:
Explanation: The singlet lifetime is inversely proportional to the sum of the radiative and non-radiative decay rate constants.
Details: Understanding singlet lifetimes is crucial in photochemistry, molecular spectroscopy, and the design of fluorescent materials.
Tips: Enter the rate constant of fluorescence and the rate constant of non-radiative reaction in Hz. Both values must be > 0.
Q1: What is a typical range for singlet lifetimes?
A: Singlet lifetimes typically range from nanoseconds to microseconds depending on the molecule and environment.
Q2: How does temperature affect singlet lifetime?
A: Higher temperatures often increase non-radiative decay rates, thereby decreasing singlet lifetime.
Q3: What factors influence the rate constant of fluorescence?
A: Molecular structure, solvent effects, and temperature are primary factors affecting Kf.
Q4: How is this different from triplet lifetime?
A: Singlet lifetimes are typically shorter than triplet lifetimes due to different selection rules for decay processes.
Q5: Can this calculator be used for any excited state?
A: This specifically calculates singlet state lifetime. Different formulas apply for triplet states or other excited states.