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Title: Multiplexed characterization of complex gas-phase mixtures combining chirped-pulse Fourier transform microwave spectroscopy and VUV photoionization time-of-flight mass spectrometry

Abstract

We examine details of the design and operation of a single apparatus that combines Chirped-Pulse Fourier Transform Microwave (CP-FTMW) spectroscopy with vacuum ultraviolet (VUV) photoionization Time-of-Flight Mass Spectrometry (TOFMS). The supersonic expansion used for cooling samples is interrogated first by passing through the region between two microwave horns capable of broadband excitation and detection in the 2-18 GHz frequency region of the microwave. After passing through this region, the expansion is skimmed to form a molecular beam, before being probed with 118 nm (10.5 eV) single-photon VUV photoionization in a linear time-of-flight mass spectrometer. The two detection schemes are powerfully complementary to one another. CP-FTMW detects all components with significant permanent dipole moments. Rotational transitions provide high-resolution structural data. VUV TOFMS provides a gentle and general method for ionizing all components of a gas phase mixture with ionization thresholds below 10.5 eV, providing their molecular formulae. The advantages, complementarity, and limitations of the combined methods are highlighted through findings on two gas-phase mixtures made up of (i) three furanic compounds, two of which are structural isomers of one another, and (ii) the effluent from a flash pyrolysis source with o-guaiacol as the precursor.

Authors:
 [1];  [2];  [2];  [2]; ORCiD logo [2]
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  1. Purdue Univ., West Lafayette, IN (United States); Univ. of Rennes 1 (France)
  2. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540250
Alternate Identifier(s):
OSTI ID: 1468880
Grant/Contract Number:  
FG02-96ER14656
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Fritz, Sean M., Hays, Brian M., Hernandez-Castillo, Alicia O., Abeysekera, Chamara, and Zwier, Timothy S. Multiplexed characterization of complex gas-phase mixtures combining chirped-pulse Fourier transform microwave spectroscopy and VUV photoionization time-of-flight mass spectrometry. United States: N. p., 2018. Web. doi:10.1063/1.5046085.
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Fritz, Sean M., Hays, Brian M., Hernandez-Castillo, Alicia O., Abeysekera, Chamara, & Zwier, Timothy S. Multiplexed characterization of complex gas-phase mixtures combining chirped-pulse Fourier transform microwave spectroscopy and VUV photoionization time-of-flight mass spectrometry. United States. https://doi.org/10.1063/1.5046085
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Fritz, Sean M., Hays, Brian M., Hernandez-Castillo, Alicia O., Abeysekera, Chamara, and Zwier, Timothy S. Thu . "Multiplexed characterization of complex gas-phase mixtures combining chirped-pulse Fourier transform microwave spectroscopy and VUV photoionization time-of-flight mass spectrometry". United States. https://doi.org/10.1063/1.5046085. https://www.osti.gov/servlets/purl/1540250.
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@article{osti_1540250,
title = {Multiplexed characterization of complex gas-phase mixtures combining chirped-pulse Fourier transform microwave spectroscopy and VUV photoionization time-of-flight mass spectrometry},
author = {Fritz, Sean M. and Hays, Brian M. and Hernandez-Castillo, Alicia O. and Abeysekera, Chamara and Zwier, Timothy S.},
abstractNote = {We examine details of the design and operation of a single apparatus that combines Chirped-Pulse Fourier Transform Microwave (CP-FTMW) spectroscopy with vacuum ultraviolet (VUV) photoionization Time-of-Flight Mass Spectrometry (TOFMS). The supersonic expansion used for cooling samples is interrogated first by passing through the region between two microwave horns capable of broadband excitation and detection in the 2-18 GHz frequency region of the microwave. After passing through this region, the expansion is skimmed to form a molecular beam, before being probed with 118 nm (10.5 eV) single-photon VUV photoionization in a linear time-of-flight mass spectrometer. The two detection schemes are powerfully complementary to one another. CP-FTMW detects all components with significant permanent dipole moments. Rotational transitions provide high-resolution structural data. VUV TOFMS provides a gentle and general method for ionizing all components of a gas phase mixture with ionization thresholds below 10.5 eV, providing their molecular formulae. The advantages, complementarity, and limitations of the combined methods are highlighted through findings on two gas-phase mixtures made up of (i) three furanic compounds, two of which are structural isomers of one another, and (ii) the effluent from a flash pyrolysis source with o-guaiacol as the precursor.},
doi = {10.1063/1.5046085},
journal = {Review of Scientific Instruments},
number = 9,
volume = 89,
place = {United States},
year = {2018},
month = {9}
}
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https://doi.org/10.1063/1.5046085
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    journal, July 2019

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    Propagating molecular rotational coherences through single-frequency pulses in the strong field regime
    journal, August 2019

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    • DOI: 10.1063/1.5099049

    Strong-field coherence breaking as a tool for identifying methyl rotor states in microwave spectra: 2-hexanone
    journal, July 2019

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    • The Journal of Chemical Physics, Vol. 151, Issue 4
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