ULTRASENSITIVE, HIGH ACCURACY MEASUREMENTS OF TRACE GAS SPECIES

Long, David A.

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https://hdl.handle.net/2142/79367 Copy

Description

Title

ULTRASENSITIVE, HIGH ACCURACY MEASUREMENTS OF TRACE GAS SPECIES

Author(s)

Long, David A.

Contributor(s)

• Hodges, Joseph
• Plusquellic, David F.
• Fleisher, Adam J.

Issue Date

24-Jun-15

Keyword(s)

Mini-symposium: High-Precision Spectroscopy

Abstract

Our laboratory seeks to apply novel cavity-enhanced spectroscopic techniques to present problems in atmospheric and physical chemistry. Primarily we use cavity ring-down spectroscopy in which the passive decay of optical power within a Fabry-P'{e}rot resonator is utilized to extract an absorption signal. With this technique we have demonstrated quantum (shot) noise limited sensitivities in both the near-infrared and mid-infrared spectral regions. Both commercial and home-built optical frequency combs are employed either to serve as absolute frequency references for molecular spectra or in a multiheterodyne approach for multiplexed sensing. I will discuss this novel instrumentation as well as measurements we have made of atmospherically relevant species such as CO$_{2}$, H$_{2}$O, O$_{2}$, CH$_{4}$, and CO with implications for emph{in situ} and remote (i.e. satellite-based) sensing. I will conclude by discussing future directions and plans for challenging measurements in the mid-infrared.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/79367

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