Distinction of <i>ortho</i>‐ and <i>para</i>‐Xylene by Femtosecond‐Laser Mass Spectrometry

Urbasch, G.; Breunig, Hans Georg; Weitzel, Karl‐Michael

doi:10.1002/cphc.200700498

Cited by 15 publications

(18 citation statements)

References 21 publications

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“…Tailored fs-laser pulses have been demonstrated to have interesting applications in chemical analysis, such as for the distinction of structural isomers. [26,27] The power of the technique arises from a combination of high-peak power necessary for laser ionization combined with a large spectral bandwidth, which in addition can easily be shaped or even turned into a white-light continuum. [28] It will be worthwhile to extend this work to the analysis of enantiomers.…”

Section: Resultsmentioning

confidence: 99%

Circular Dichroism in Ion Yields of Femtosecond‐Laser Mass Spectrometry

et al. 2009

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Section: Resultsmentioning

confidence: 99%

Circular Dichroism in Ion Yields of Femtosecond‐Laser Mass Spectrometry

et al. 2009

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“…In one approach, different relative ion yields of the major fragment (C 7 H 7 + ) ions were produced by dividing the frequency spectrum of the femtosecond pulse into different groups and changing their phase retardation 28 . An alternate approach exploited the time domain of the pulse, instead of the frequency domain 29 . By varying the chirp of the laser pulse, differences in the ion yields of the two isomers, in particular the small fragments, were amplified.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser Mass Spectrometry and High Harmonic Spectroscopy of Xylene Isomers

Alharbi

Boguslavskiy

Austin

et al. 2018

Sci Rep

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Structural isomers, molecules having the same chemical formula but with atoms bonded in different order, are hard to identify using conventional spectroscopy and mass spectrometry. They exhibit virtually indistinguishable mass spectra when ionized by electrons. Laser mass spectrometry based on photoionization of the isomers has emerged as a promising alternative but requires shaped ultrafast laser pulses. Here we use transform limited femtosecond pulses to distinguish the isomers using two methods. First, we probe doubly charged parent ions with circularly polarized light. We show that the yield of doubly charged ortho-xylene decreases while para-xylene increases over a range of laser intensities when the laser polarization is changed from linear to circular. Second, we probe high harmonic generation from randomly oriented isomer molecules subjected to an intense laser field. We show that the yield of high-order harmonics varies with the positioning of the methyl group in xylene isomers (ortho-, para- and meta-) and is due to differences in the strength of tunnel ionization and the overlap between the angular peaks of ionization and photo-recombination.

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“…Even structural isomers can be distinguished by means of chirped fs-laser ionization, e.g. in the case of o-xylene and p-xylene [21]. Very pronounced sign-dependent chirp effects have been recently demonstrated by our group in the fs-laser ionization and dissociation of ethane [22,23].…”

Section: Introductionmentioning

confidence: 97%

Photoionization Yields in Intense fs-Laser Fields – A Systematic Investigation of Chirp Effects

Reusch

Griebe

Karges

et al. 2015

Zeitschrift Für Physikalische Chemie

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Abstract:The femtosecond laser ionization of several small hydrocarbon molecules (methane, ethane, propane) has been investigated as a function of the second order spectral phase (linear chirp) of laser pulses centered at = 807 nm.Ion yields are demonstrated to depend markedly on the linear chirp parameter. At laser intensities exceeding 5 × 10 14 W/cm 2 the ionization characteristics resemble an intensity-driven process, i.e. the largest ion yield is observed for a close to transform-limited laser pulse. For smaller laser intensities a pronounced sign effect in the chirp dependence appears, i.e. the maximum ion yield is observed for a negative linear chirp parameter of several hundred to thousand fs 2 . We suggest that this sign effect is connected to the anharmonicity of the electronic potentials involved. This suggestion is supported by the fact that basically no sign effect in the chirp dependence is observed for the noble gases argon, krypton and xenon. We further suggest that the electronic polarizability and structure plays some role as methanol does not show a marked sign-dependent chirp effect.

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Distinction of ortho‐ and para‐Xylene by Femtosecond‐Laser Mass Spectrometry

Cited by 15 publications

References 21 publications

Circular Dichroism in Ion Yields of Femtosecond‐Laser Mass Spectrometry

Circular Dichroism in Ion Yields of Femtosecond‐Laser Mass Spectrometry

Femtosecond Laser Mass Spectrometry and High Harmonic Spectroscopy of Xylene Isomers

Photoionization Yields in Intense fs-Laser Fields – A Systematic Investigation of Chirp Effects

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