Chirped pulse microwave spectroscopy in pulsed uniform supersonic flows: observation of k-dependent rates in the CL + propyne reaction
Ariyasingha, Nuwandi M.
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https://hdl.handle.net/2142/91369
Description
Title
Chirped pulse microwave spectroscopy in pulsed uniform supersonic flows: observation of k-dependent rates in the CL + propyne reaction
Author(s)
Ariyasingha, Nuwandi M.
Contributor(s)
Suits, Arthur
Thompson, James O. F.
Broderick, Bernadette M.
Issue Date
2016-06-24
Keyword(s)
Chirped pulse
Abstract
Chirped-Pulse Fourier-transform microwave spectroscopy in uniform supersonic flows (CPUF)
has been applied to study the reaction of Cl atoms with propyne. The approach utilizes broad-band microwave spectroscopy to extract structural information with MHz resolution and near universal detection, in conjunction with a Laval flow system, which offers thermalized conditions at low temperatures and high number densities. Our previous studies have exploited this approach to obtain multichannel product branching fractions in a number of polyatomic systems, with isomer and often vibrational level specificity. This report highlights an additional capability of the CPUF technique: here, the state-specific reactant depletion is directly monitored on a microsecond timescale. In doing so, a clear dependence on the rotational quantum number K in the rate of the reaction between Cl atoms and propyne is revealed. Future prospects for the technique will be discussed.
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