Photoelectric Effect (Cesium)
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Cs + hν → Cs+ + e−
概要
Photons with energy exceeding the work function of cesium (2.1 eV, wavelength < 590 nm) eject electrons from the metal surface. Cesium has the lowest work function of any stable element, making it the most photosensitive metal. Einstein's explanation of this effect in 1905 established the quantum nature of light and won him the Nobel Prize.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 反応物 | Cesium Cs | 1 | (s) |
日常の例
Automatic doors use photoelectric sensors that detect when a person blocks a light beam, triggering the door to open.
産業上の重要性
光電効果は光電子増倍管、太陽電池、光検出器、電子分光法（XPS）の基礎である。
特性
- タイプ
- Photochemical
- 可逆的
- いいえ
- エネルギー
- 吸熱性