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:

Where:

• \( \Phi_r \) — Quantum efficiency for reactants (dimensionless)
• \( R_{mol} \) — Reactant molecules consumed per second (molecules/s)
• \( I_{quanta} \) — Number of quanta absorbed per second (quanta/s)

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.