Fts Studies Of The 17o Enriched Isotopologues Of Co2 Toward Creating A Complete And Highly Accurate Reference Standard

Elliott, Ben

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https://hdl.handle.net/2142/50943 Copy

Description

Title

Fts Studies Of The 17o Enriched Isotopologues Of Co2 Toward Creating A Complete And Highly Accurate Reference Standard

Author(s)

Elliott, Ben

Contributor(s)

• Miller, Charles
• Brown, Linda
• Sung, Keeyoon

Issue Date

2014-06-17

Keyword(s)

Atmospheric science

Abstract

The proliferation and increased abilities of remote sensing missions for the monitoring of planetary atmospheric gas species has spurred the need for complete and accurate spectroscopic reference standards. As a part of our ongoing effort toward creating a global carbon dioxide (CO$_{2}$) frequency reference standard, we report new FTS measurements of the $^{17}$O enriched isotopologues of CO$_{2}$. The first measurements were taken in the $\nu$$_{3}$ region (2200 - 2450 cm$^{-1}$, ~65 - 75 THz), have absolute calibration accuracies of 100 kHz (3E-6 cm$^{-1}$), comparable to the uncertainties for typical sub-millimeter/THz spectroscopy. Such high absolute calibration accuracy has become regular procedure for the cases of linear molecules such as CO$_{2}$ and CO for FTS measurements at JPL, and enables us to produce measured transition frequencies for entire bands with accuracies that rival those of early heterodyne measurements for individual beat notes. Additionally, by acquiring spectra of multiple carbon dioxide isotopologues simultaneously, we have begun to construct a self-consistent frequency grid based on CO$_{2}$ that extends from 20 - 200 THz. These new spectroscopic reference standards are a significant step towards minimizing CO$_{2}$ retrieval errors from remote sensing applications, especially those involving targets with predominantly CO$_{2}$ atmospheres such as Mars, Venus and candidate terrestrial exoplanets where minor isotopologues will make significant contributions to the radiance signals.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50943

DOI

https://doi.org/10.15278/isms.2014.TI10

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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