Resonant and Nonresonant Multiphoton Ionization Processes in the Mass Spectrometry of Explosives

被引：38

作者：

Hamachi, Akifumi ^{[1
]}

Okuno, Tomoya ^{[1
]}

Imasaka, Tomoko ^{[2
]}

Kida, Yuichiro ^{[1
]}

Imasaka, Totaro ^{[1
,3
]}

机构：

[1] Kyushu Univ, Grad Sch Engn, Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan

[2] Kyushu Univ, Grad Sch Design, Chem Lab, Minami Ku, Fukuoka 8158540, Japan

[3] Kyushu Univ, Div Optoelect & Photon, Ctr Future Chem, Nishi Ku, Fukuoka 8190395, Japan

来源：

ANALYTICAL CHEMISTRY | 2015年 / 87卷 / 05期

基金：

日本学术振兴会;

关键词：

LASER IONIZATION; FEMTOSECOND LASER; IONS; DISSOCIATION; PULSE; TATP; HMTD;

D O I：

10.1021/ac504667t

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：3027 / 3031

页数：5

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