略語大辞典 [Opt] 36 MPI multi-photon ionization (分子または原子の)多光子イオン化. 多光子電離. multi-photon ionization; where an atomor molecule is ionized through successiveabsorption of photons; because of the small transition probability, the MPI is only possible with an intense laser lightsource; ref. ATI(above-thr 丸善「略語大辞典」JLogosID : 11861620