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根据量子力学微扰理论给出了在相干激发电离情形下双光子共振三光子近共振和双光子近共振三光子共振这两种四光子电离过程的电离截面表达式，表明这两种过程的离子强度与它们的起始能级有关。根据这一结论分析了实验测得的对氟甲苯分子的多光子电离谱，结果表明获得该电离谱的过程为三光子共振四光子电离过程。
According to the quantum mechanics perturbation theory, the ionization cross-section expressions of two-photon resonance three-photon resonance and two-photon near resonance three-photon resonance in the case of coherent excitation ionization are given. It is shown that the ionization cross- Intensity is related to their initial energy level. According to this conclusion, we analyzed the multi-photon ionization spectra of the p-fluorotoluene measured experimentally. The results show that the process of obtaining the ionization spectrum is a three-photon resonance four-photon ionization process.