Design and applications of a mass-correlated broadband microwave spectrometer

Fritz, Sean

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https://hdl.handle.net/2142/100688 Copy

Description

Title

Design and applications of a mass-correlated broadband microwave spectrometer

Author(s)

Fritz, Sean

Contributor(s)

• Zwier, Timothy S.
• Hays, Brian M.
• Hernandez-Castillo, Alicia O.

Issue Date

2018-06-20

Keyword(s)

Structure determination

Abstract

Chirped pulse Fourier transform microwave (CP-FTMW) spectroscopy serves as a faster-than-ever technique for structure determination that is being utilized in an ever-widening range of applications. Vacuum ultraviolet (VUV) time-of-flight mass spectrometry (TOFMS) provides a gentle and general ionization scheme for measurement of the masses, and hence molecular formulae, of the components of a gas mixture, as long as these components have ionization potentials below the threshold for single-photon photoionization (118 nm = 10.5 eV in this case). By combining these two methods, a powerful tool is created for determining the structures of the components in a mixture. By following the correlation between the microwave transition intensities and the mass-resolved signals in the TOF mass spectrum, the molecular formulae of the carriers of the microwave transitions can be determined. In this sense, the combination of CP-FTMW with VUV TOFMS produces mass-correlated broadband microwave spectra. Herein, we discuss the design, construction and initial applications of a new chamber that was designed to acquire simultaneous mass and rotational spectra. Proof of concept will be demonstrated by examining a gaseous mixture of 2-methoxyfuran, furan and furfural. The new spectrometer is also being used to characterize resonance stabilized radicals formed by a pyrolysis source. Application in this context will also be discussed.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100688

DOI

10.15278/isms.2018.WK01

Copyright and License Information

Copyright 2018 Sean Fritz

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