Waveguide CP-FTMW spectroscopy of ethyl cyanoformate: Exploring the possibility of seeing exchange-averaged states
Westerfield, J. H.
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https://hdl.handle.net/2142/100643
Description
Title
Waveguide CP-FTMW spectroscopy of ethyl cyanoformate: Exploring the possibility of seeing exchange-averaged states
Author(s)
Westerfield, J. H.
Contributor(s)
Shipman, Steven
Issue Date
2018-06-19
Keyword(s)
Dynamics and kinetics
Abstract
The microwave spectrum of ethyl cyanoformate was recorded at 261 K from 8.7 - 26.5 GHz with waveguide chirpedpulse Fourier transform microwave spectroscopy (CP-FTMW). Ethyl cyanoformate has been studied previously by Suenram, True, and Bohn in a Stark modulation cell. In that work, the data showed contributions from two stable ethyl cyanoformate conformers as well as an additional series of broad features ascribed to an exchange-averaged state, in analogy to similar features routinely seen in NMR chemical exchange measurements. In recent years, True has provided estimates for the lifetimes of these exchange species.
Our high resolution spectra of a thermalized sample of ethyl cyanoformate at 261 K show contributions from syn-anti and syn-gauche conformers in agreement with the previous work. Using our standard data collection methods, however, we do not see evidence for the presence of exchange averaged bands. In this talk, we will highlight the similarities and differences of our work to previous work on this molecule and discuss the possibilities of observing these types of species with our spectrometer.
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