Interaction of (CCl4)n clusters with nanosecond and picosecond laser pulses at discrete wavelengths spanning from IR to UV region: A comparative study using TOFMS

Sharma, Pramod K.; Das, Soumitra; Vatsa, R.K.

doi:10.1016/j.ijms.2020.116291

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…On the other hand, as reported by several groups including us, ,− ,,,− MCAI formation in moderate nanosecond laser fields is wavelength-dependent, i.e. the longer the wavelength (visible and longer), the higher the charge states of the observed MCAIs.…”

mentioning

confidence: 53%

Production of Multiply Charged Argon Ions in Moderate Nanosecond Laser Fields: An Open Question or a Forgone Conclusion?

Yao

Zhang

Pandey

et al. 2020

J. Phys. Chem. Lett.

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We reply to the Viewpoint by Vatsa and Mathur on our publication reporting the observation of multiply charged atomic ions from argon clusters doped with aromatic chromophores in a moderate nanosecond laser field. Vatsa and Mathur raised three concerns about the proposed explanation and offered additional ideas for the reported process. We agree with some of their concerns and welcome the addition of information, and we also clarify a few misunderstandings of our intention, perhaps caused by our implicit assumption of contextual relations. While the experimental results are indisputable, the interpretation is still a topic of debate, subject to further experimental investigations and theoretical modeling.

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mentioning

confidence: 53%

Production of Multiply Charged Argon Ions in Moderate Nanosecond Laser Fields: An Open Question or a Forgone Conclusion?

Yao

Zhang

Pandey

et al. 2020

J. Phys. Chem. Lett.

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“…in Xe, CCl 4 , CS 2 , C 2 H 5 OC 2 H 5 , etc., van der Waals forces are the predominant interactions holding the cluster constituents together. [12][13][14] In the present case, we have chosen ethanol clusters where extensive intermoelcular hydrogen bonding takes place among the molecules due to the presence of OH groups. Based on the photoionisation study of ethanol clusters and upon comparing with previous results, we can elucidate the role of hydrogen bonding in the ionsation mechanism of clusters at 10 12 W cm À2 .…”

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confidence: 99%

Wavelength dependent photoionisation of ethanol clusters: generation of hydrogen like C⁵⁺ ions at terawatt laser intensity

Das

Sharma

2022

Phys. Chem. Chem. Phys.

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“…A reasonable step if to compare proposed aromatic hydrocarbons with tetrachloromethane (IE = 11.47 eV [27]) from alkyl halides class, also used as dopants [19]. Published works report a different behaviour of CCl4 under laser irradiation at including photofragmentation [28] at high intensities ( > 10 9 W/cm 2 ). Substances of such class do not act as source of electrons.…”

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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Interaction of (CCl4)n clusters with nanosecond and picosecond laser pulses at discrete wavelengths spanning from IR to UV region: A comparative study using TOFMS

Cited by 5 publications

References 30 publications

Production of Multiply Charged Argon Ions in Moderate Nanosecond Laser Fields: An Open Question or a Forgone Conclusion?

Production of Multiply Charged Argon Ions in Moderate Nanosecond Laser Fields: An Open Question or a Forgone Conclusion?

Wavelength dependent photoionisation of ethanol clusters: generation of hydrogen like C⁵⁺ ions at terawatt laser intensity

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

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Interaction of (CCl4)n clusters with nanosecond and picosecond laser pulses at discrete wavelengths spanning from IR to UV region: A comparative study using TOFMS

Cited by 5 publications

References 30 publications

Production of Multiply Charged Argon Ions in Moderate Nanosecond Laser Fields: An Open Question or a Forgone Conclusion?

Production of Multiply Charged Argon Ions in Moderate Nanosecond Laser Fields: An Open Question or a Forgone Conclusion?

Wavelength dependent photoionisation of ethanol clusters: generation of hydrogen like C5+ ions at terawatt laser intensity

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

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Wavelength dependent photoionisation of ethanol clusters: generation of hydrogen like C⁵⁺ ions at terawatt laser intensity