Analytical Application of Resonance‐Enhanced Multiphoton Ionization Mass Spectrometry (<scp>REMPI</scp>‐<scp>MS</scp>)

Streibel, Thorsten; Boesl, U.; Zimmermann, Ralf

doi:10.1002/9783527682201.ch4

Cited by 3 publications

(3 citation statements)

References 80 publications

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“…The efficiency of ion formation depends on (a) parameters of the ionization laser such as photon energy (wavelength), fluence, pulse length and beam profile and (b) the chemical composition, size, and optical properties of the individual particle. Additional steps to enhance the analytic capabilities involve desorbing the particles at a weaker laser energy and triggering a process called Resonance-Enhanced-Multi-Photon-Ionization (REMPI) used to detect particle-bound metals and polycyclic aromatic hydrocarbons (PAHs) with high selectivity [16,17].…”

Section: Materials 21 Experimental Set-upmentioning

confidence: 99%

Real-time particle analysis of explosives compounds using single-particle mass spectrometry

Ruser,

Schade,

Jeong

et al. 2024

Next-Generation Spectroscopic Technologies XVI

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The detection of trace amounts of hazardous agents has become crucial for protection of human life, infrastructure and the environment. Single-particle mass spectrometry (SPMS) has proven to be a sensitive measurement technique for instantly revealing the chemical composition of individual, potentially harmful aerosol and dust particles. In this study, we focus on profiling non-volatile particles of explosive compounds in powdered form. It is reported, how the unique SPMS technology, based on (1) particle velocimetry and sizing, (2) sophisticated laser ionization and (3) bipolar time-offlight mass spectrometry (TOF-MS) has been tailored and applied for the detection of individual particles of common explosive substances in the micro-and nanometer range. Out of more than 30 different types of military and home-made explosives, which were investigated in our recent laboratory measurements, the mass spectra of 12 commonly used explosives compounds are examined. Steps are described for automated and reliable identification of characteristic spectral markers of each of the explosives in their respective mass spectra.

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Section: Materials 21 Experimental Set-upmentioning

confidence: 99%

Real-time particle analysis of explosives compounds using single-particle mass spectrometry

Ruser,

Schade,

Jeong

et al. 2024

Next-Generation Spectroscopic Technologies XVI

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“…Viable alternatives to synchrotron radiation for such applications are already established with laboratory-scale lasers systems able to provide more convenient and accessible sources of the required photons. Multiphoton ionization with UV lasers brings its own advantages in an analytical context; 68 alternatively harmonic generation of VUV photons at multi kHz repetition rates has been demonstrated to permit efficient electron-ion coincidence modes of data recording. 61,69 Efficient harmonic generation methods can now also generate VUV photons with a high degree of circular polarization, 70 including the 9-10 eV range 71 convenient for these terpene studies.…”

Section: Conclusion and Perspectivementioning

confidence: 99%

Analysis of the volatile monoterpene composition of citrus essential oils by photoelectron spectroscopy employing continuously monitored dynamic headspace sampling

Ganjitabar,

Hadidi,

Garcia

et al. 2023

Analyst

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“…Besides ionization potential below energy of two photons (9.32 eV) intermediate excited state after single-photon excitation should decay slowly enough to allow second photon excite the molecule further above ionization energy. Two-photon laser ionization with release of electrons was demonstrated for benzene, toluene, naphthalene and methylated naphtalenes in [14][15][16]20,21]. Toluene [22,23] and 1-methylnaphtalene (α-methylnaphtalene) [24][25][26] with fast intersystem crossing from singlet to triplet state and relatively slow triplet state decay can be used as some of the most suitable candidates for the role of organic dopants .…”

Section: Introductionmentioning

confidence: 99%

Use of dopants for detection of vapors of explosives by laser field asymmetric ion mobility spectrometer

Akmalov

Chistyakov²,

Kotkovskii³

et al. 2022

Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies VI

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Ion mobility spectrometry (IMS) today figures prominently among analytical methods for detection of explosives and is widely used for transport security. This method is highly appreciated for capability to distinguish low quantity of different types of explosives at atmospheric pressure. The main obstacle for sensing some kinds of explosives is their very low vapor pressure so that the limit of detection of state-of-the-art IMS instrumentation 10-13 –10-14 g/cm3 lacks at least an order of magnitude. In this paper we combine promising UV laser radiation along with application of organic compounds (dopants) to improve ionization efficiency and vapor detection capabilities of IMS. Dopants with low ionization energy (toluene and 1-methylnaphtalene) were used for negative ion formation of nitro group-based explosives: trinitrotoluene (TNT), cyclotrimethylenetrinitramine (RDX) and pentaerythritol tetranitrate (PETN). Presence of dopants in the sample results in multiple growth of ion yield at laser intensities lower than 2 × 107 W/cm2. Limits of detection with dopant-assisted laser ionization (4.7 × 10-16 g/cm3 for RDX and 9.8 × 10-15 g/cm3 for PETN) show up to 2-fold improvement compared with no dopant case. Results propose a way to further improve sensitivity of detectors and reduce manufacturing costs by lowering requirements to laser pulse energy and using cheaper lasers.

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Analytical Application of Resonance‐Enhanced Multiphoton Ionization Mass Spectrometry (REMPI‐MS)

Cited by 3 publications

References 80 publications

Real-time particle analysis of explosives compounds using single-particle mass spectrometry

Real-time particle analysis of explosives compounds using single-particle mass spectrometry

Analysis of the volatile monoterpene composition of citrus essential oils by photoelectron spectroscopy employing continuously monitored dynamic headspace sampling

Use of dopants for detection of vapors of explosives by laser field asymmetric ion mobility spectrometer

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