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Quantum Efficiency for Disappearance of Reactant Calculator

Quantum Efficiency Formula:

\[ \Phi_r = \frac{R_{mol}}{I_{quanta}} \]

molecules/s
quanta/s

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1. What is Quantum Efficiency for Disappearance of Reactant?

Definition: Quantum efficiency for reactants is a measure of the efficiency of the use of light for reactants in a photochemical reaction.

Purpose: It helps chemists and researchers understand how effectively light energy is being used to drive a photochemical reaction.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \Phi_r = \frac{R_{mol}}{I_{quanta}} \]

Where:

Explanation: The formula calculates how many reactant molecules disappear per photon absorbed.

3. Importance of Quantum Efficiency

Details: Quantum efficiency helps in understanding reaction mechanisms, optimizing light sources, and improving reaction yields in photochemistry.

4. Using the Calculator

Tips: Enter the number of reactant molecules consumed per second and the number of quanta absorbed per second. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does a quantum efficiency of 1 mean?
A: A value of 1 means one reactant molecule disappears for each photon absorbed (ideal case).

Q2: Can quantum efficiency be greater than 1?
A: Yes, in chain reactions where one photon initiates multiple reaction events.

Q3: How do I measure reactant molecules consumed?
A: Typically measured using spectroscopic techniques or product analysis over time.

Q4: How do I determine quanta absorbed?
A: Measured using actinometry or calculated from light intensity and absorption measurements.

Q5: What affects quantum efficiency?
A: Factors include wavelength, temperature, reactant concentration, and presence of sensitizers or quenchers.

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