Home Back

Rate of Deactivation Calculator

Rate of Deactivation Formula:

\[ R_{Deactivation} = (K_{NR} + K_f) \times [^1M_S] \]

Hz
Hz
mol/m³

Unit Converter ▲

Unit Converter ▼

From: To:

1. What is Rate of Deactivation?

Definition: The Rate of Deactivation is the rate of change of chemical conversion with time, representing how quickly a system loses its excited state energy.

Purpose: This calculator helps researchers and chemists determine the rate at which molecules return to their ground state from excited singlet states.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ R_{Deactivation} = (K_{NR} + K_f) \times [^1M_S] \]

Where:

Explanation: The sum of the non-radiative and fluorescence rate constants is multiplied by the concentration of molecules in the singlet state.

3. Importance of Rate of Deactivation

Details: Understanding deactivation rates is crucial in photochemistry, material science, and fluorescence studies to design better materials and understand reaction mechanisms.

4. Using the Calculator

Tips: Enter the rate constants (KNR and Kf) in Hz and the singlet state concentration in mol/m³. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between KNR and Kf?
A: KNR represents non-radiative energy loss (as heat), while Kf represents energy loss through fluorescence.

Q2: What are typical values for these rate constants?
A: Kf typically ranges from 106 to 109 Hz for fluorescent molecules, while KNR varies more widely.

Q3: How do I measure the singlet state concentration?
A: This is typically determined experimentally using absorption spectroscopy or calculated from excitation conditions.

Q4: What units should I use for the inputs?
A: Rate constants should be in Hz (s-1) and concentration in mol/m³.

Q5: Can this be used for triplet states?
A: No, this formula specifically applies to singlet state deactivation. Triplet states involve different processes.

Rate of Deactivation Calculator© - All Rights Reserved 2025