Chlorophyll Fluorescence

Chlorophyll + hν (blue/red) → Chlorophyll* → Chlorophyll + hν (red)

Aperçu

Chlorophyll absorbs blue (430 nm) and red (660 nm) light, reaching an excited singlet state. Most energy is transferred to the photosynthetic reaction center, but a small fraction (1–2%) is re-emitted as red fluorescence (680–740 nm). This fluorescence is a direct indicator of photosynthetic efficiency.

Exemple du quotidien

If you shine a UV light on a spinach extract, it glows red due to chlorophyll fluorescence — a common chemistry demonstration.

Importance industrielle

Chlorophyll fluorescence measurement (PAM fluorometry) is used in agriculture, forestry, and ecology to assess plant health and stress.

Propriétés

Type: Photochemical
Réversible: Oui
Énergie: Exothermique

Réactions associées

Photochemical Smog Formation (NO₂ Photolysis) Photochromism of Spiropyran Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Silver Chloride Photodecomposition Dye-Sensitized Solar Cell (Grätzel Cell)

Frequently Asked Questions

What is the equation for Chlorophyll Fluorescence?

The balanced equation is: Chlorophyll + hν (blue/red) → Chlorophyll* → Chlorophyll + hν (red).

What type of reaction is Chlorophyll Fluorescence?

Chlorophyll Fluorescence is a photochemical reaction. It is reversible under certain conditions.

Is Chlorophyll Fluorescence exothermic or endothermic?

Chlorophyll Fluorescence is exothermic (releases energy).