noun
photoionization
Technical term in physics and chemistry for ionization caused by absorption of photons.
光イオン化は質量分析でよく使われる技術です。
Photoionization is a technique often used in mass spectrometry.
General term for ionization; 光イオン化 specifies ionization by light.
Compound of 光 (ひかり, 'light') + イオン化 (イオンか, 'ionization'), a calque of English 'photoionization'.