Resonant and nonresonant multiphoton ionization processes in the mass spectrometry of explosives

Totaro Imasaka, Akifumi Hamachi, Tomoya Okuno, Tomoko Imasaka, Yuichiro Kida

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3027-3031
Number of pages5
JournalAnalytical chemistry
Volume87
Issue number5
DOIs
Publication statusPublished - Mar 3 2015

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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