\newcommand{\wn}{cm$^{-1}$} % quick wavenumber
\newcommand{\nub}[1]{$\, \nu _#1$} % quick state name

\title{THE PURE ROTATIONAL FIR SPECTRA OF THE HO$_2$ RADICAL MEASURED \\
BY FOURIER TRANSFORM SPECTROSCOPY}
\author{\underline{ALBRECHT VON BARGEN}, MANFRED~BIRK and GEORG WAGNER}
\address{DLR - Deutsche Forschungsanstalt f\"ur Luft- und Raumfahrt e.V., Institut f\"ur Optoelektronik, Postfach 1116, D-82230 We\ss ling, Germany}

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\maketitle

\noindent Covering the spectral range 30 -- 200 cm$^{-1}$, spectra of the HO$_2$ radical have been recorded with a Fourier transform spectrometer (Bruker IFS 120HR) in combination with a White type absorption cell (absorption path length 72 m) at high resolution (1/MOPD = 0.0017 cm$^{-1}$). Because of the fast self-disproportion of HO$_2$ the measurements were performed under flow conditions.

\noindent A line fitting program (INTBAT) was used to obtain the line positions and line strengths of more than 250 b-type transitions up to N$^{\prime \prime}$ = 22 and K$^{\prime \prime}$ = 4. Utilizing an A-reduced Hamiltonian in a parity conserving basis set the molecular parameters were determined by means of a non linear least squares fitting program. The results of the fit and a discussion of the relative line strengths will be presented.

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