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\documentclass[11pt]{article}

\usepackage{hrms}  %% Page settings, style ... for the HRMS abstract book.

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\title{PRESSURE-DEPENDENT LINE INTENSITY AND CONTINUUM ABSORPTION FOR PURE CO$_2$: EXPERIMENTAL RESULTS}

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\author{\underline{\FirstName M. \LastName BIRK},
  \FirstName C. \LastName R\"OSKE,
  \FirstName G. \LastName WAGNER}
\address{Remote Sensing Technology Institute, German Aerospace Center (DLR), D-82234 Wessling, Germany}\\

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\author{\FirstName H. \LastName TRAN}
\address{LMD, IPSL, Sorbonne Universite, Ecole Polytechnique, CNRS, Paris, France}

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\usepackage{fancyhdr}
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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
\fancyfoot[C]{}
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\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\category {9,14}
\begin{document}

\maketitle  %% This will also build the list of author(s) and addresse(s).

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%% Place the body of your abstract below.
Fourier-transform measurements of pure CO$_2$ in the 1.6 $\mu$m region covering bands from ground state to 30011, 30012, 30013, 
and 30014 states at ambient temperature and 212 K with pressures up to 1 bar have been recorded. 
Line parameters have been retrieved by multispectrum fitting. An intensity depletion parameter quantifying linear 
intensity dependence on pressure was introduced and fitted. From the fitted baseline polynomials the self 
continuum was determined for the 30012 and 30013 bands. The depleted intensity was found to be transferred to 
the continuum for both temperatures, thus the band intensity is conserved. The intensity in the continuum 
at 1 atm was about 1\% of the total band intensities for ambient temperature and about 3\% at 212 K. 
For both temperatures the depleted intensity/continuum area was found in excellent agreement with values 
calculated from the second virial coefficient.\\
The experimental work is accompanied by rCMDS calculations\footnote{Ha Tran et al., Pressure dependent line intensity and continuum absorption for pure CO2: predictions 
by requantized molecular dynamics simulations, this conference.}.\\ 
The results presented here have significant impact on CO$_2$ retrieval from atmospheric measurements. For OCO/CO2M-type observations it 
was calculated that in case of the 2 $\mu$m band retrieved CO$_2$ columns are too large by about 3\% when omitting depletion and continuum.
A new spectroscopic database was produced. Systematic line intensity uncertainties are well below 0.1\%.




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