Femtosecond Laser Mass Spectrometry and High Harmonic Spectroscopy of Xylene Isomers.

Abstract:

: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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Alharbi A,Boguslavskiy AE,Austin D,Thiré N,Wood D,Hawkins P,McGrath F,Johnson AS,Lopez-Quintas I,Schmidt B,Légaré F,Marangos JP,Le AT,Bhardwaj R

doi

10.1038/s41598-018-22055-9

subject

Has Abstract

pub_date

2018-02-28 00:00:00

pages

3789

issue

1

issn

2045-2322

pii

10.1038/s41598-018-22055-9

journal_volume

8

pub_type

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