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Title: Broadband multi-resonant strong field coherence breaking as a tool for single isomer microwave spectroscopy

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4962505· OSTI ID:1467887

Using standard hardware available in chirped-pulse Fourier transform microwave (CP-FTMW) spectroscopy, an experimental method is introduced to selectively extract from the microwave spectrum of an otherwise complicated multicomponent mixture a set of transitions due to a single component, thereby speeding spectral assignment. The method operates the broadband chirped-pulse used to excite the sample in the strong-field limit through a combination of high power and control of the sweep rate. A procedure is introduced that leads to selection of three transition frequencies that can be incorporated as a set of resonant sequential single-frequency microwave pulses that follow broadband chirped-pulse excitation, resulting in a reduction in the coherent signal from a set of transitions ascribable to the component of interest. The difference in the CP-FTMW spectrum with and without this set of multi-resonant single-frequency pulses produces a set of transitions that can confidently be assigned to a single component of the mixture, aiding the analysis of its spectrum. In conclusion, the scheme is applied to (i) selectively extract the spectrum of one of five singly 13C-subsituted isotopologues of benzonitrile in natural abundance, (ii) obtain the microwave spectra of the two structural isomers (E)- and (Z)-phenylvinylnitrile, and (iii) obtain conformer-specific microwave spectra of methylbutyrate.

Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-96ER14656; PRF #55152-ND6
OSTI ID:
1467887
Alternate ID(s):
OSTI ID: 1325601
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 11; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (6)

Broadband rotational spectroscopy of trans 3-pentenenitrile and 4-pentenenitrile journal January 2019
Automated assignment of rotational spectra using artificial neural networks journal September 2018
Multiplexed characterization of complex gas-phase mixtures combining chirped-pulse Fourier transform microwave spectroscopy and VUV photoionization time-of-flight mass spectrometry journal September 2018
Propagating molecular rotational coherences through single-frequency pulses in the strong field regime journal August 2019
Strong-field coherence breaking as a tool for identifying methyl rotor states in microwave spectra: 2-hexanone journal July 2019
Automated Assignment of Rotational Spectra Using Artificial Neural Networks conference June 2018