**\timereq{15}**

**\category{4,11}**

**\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**}**

**\begin{document}**

**\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.

**\end{**document**}**