Panel A: mass spectrum of DC/9-methylanthracene cluster cations trapped in QIT without laser irradiation. The inset is a zoom-in of the mass spectrum, revealing newly formed clusters: C₁₅H₁₂DDC⁺ and (C₁₅H₁₂)₂DDC⁺. Panel B: mass spectrum of DC/9-methylanthracene cluster cations trapped in QIT with and without laser irradiation upon 355 nm irradiation at 0.5 and 1.1 mJ laser energy (the irradiation times were 0.6 s, from 4.2−4.8 s).