Hamachi Akifumi, Okuno Tomoya, Imasaka Tomoko, Kida Yuichiro, Imasaka Totaro
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
Anal Chem. 2015 Mar 3;87(5):3027-31. doi: 10.1021/ac504667t. Epub 2015 Feb 9.
Multiphoton ionization processes were studied for three types of explosives using a line-tunable ultraviolet femtosecond laser. When peroxides such as triacetone triperoxide (TATP) and hexamethylene triperoxide diamine (HMTD) were ionized through a nonresonant two-photon process, a molecular ion was dominantly observed by reducing the excess energy remaining in the ion. However, an aromatic nitro compound such as 2,4,6-trinitrotoluene (TNT) produced large signals arising from molecular and fragment ions by resonant two-photon ionization. In addition, only fragment ions were produced from a nonaromatic nitro compound such as 1,3,5-trinitroperhydro-1,3,5-triazine (RDX), even when a resonant two-photon ionization process was employed, suggesting that a further reduction in excess energy would be necessary if a molecular ion were to be observed.
使用线可调谐紫外飞秒激光研究了三种炸药的多光子电离过程。当诸如三丙酮三过氧化物（TATP）和六亚甲基三过氧化二胺（HMTD）之类的过氧化物通过非共振双光子过程电离时，通过减少离子中剩余的多余能量，主要观察到分子离子。然而，诸如2,4,6-三硝基甲苯（TNT）之类的芳香族硝基化合物通过共振双光子电离产生了来自分子离子和碎片离子的大信号。此外，即使采用共振双光子电离过程，非芳香族硝基化合物如1,3,5-三硝基全氢-1,3,5-三嗪（RDX）也仅产生碎片离子，这表明如果要观察到分子离子，需要进一步降低多余能量。
