# O3_VOIGT¶

Tabulated high resolution cross-sections of O3 measured by Voigt et al. 2001. The resolution is a constant 5 cm-1 (0.027 nm at 230 nm to 0.36 nm at 850 nm).

## Temperatures¶

The Voigt paper presents a new exponential interpolation algorithm for interpolating cross-sections in temperature. This class does not yet use this technique but uses truncated linear interpolation. Measurements are provided at the following five temperatures,

• 203 K
• 223 K
• 246 K
• 280 K
• 293 K

## Example¶

optprop = ISKOpticalProperty('O3_VOIGT')
msis = ISKClimatology('MSIS90');
mjd = 52393.3792987115;
location = [0.0, 0.0, 25000.0, mjd];
optprop.SetAtmosphericState( msis)
optprop.SetLocation(location)
[ok, abs, ext,sca] = optprop.CalculateCrossSections( 1.0E7/600.0, location );


## Properties¶

SetTemperature (double n)

Sets the temperature in Kelvins that will be used in the next calculation of cross-sections.

## References¶

1. Voigt S., J. Orphal, K. Bogumil, J.P. Burrows, The temperature dependence (203–293 K) of the absorption cross sections of O3 in the 230–850 nm region measured by Fourier-transform spectroscopy. Journal of Photochemistry and Photobiology A: Chemistry Vol. 143, 2001. 2.Orphal J. et al. A critical review of the absorption cross-sections of O3 and NO2 in the 240-790 nm region. ESA Technical Note MO-TN-ESA-GO-0302, 2002.

## Abstract of Paper 1.¶

Absolute absorption cross sections of O3 were measured in the
230–850 nm (11765–43478 cm?1) region at five different temperatures
(203–293 K) using a Fourier-transform spectrometer, at a spectral
resolution of 5.0 cm-1 (corresponding to about 0.027 nm at 230 nm
and to about 0.36 nm at 850 nm). The spectral accuracy of the data
is better than 0.1 cm-1 — about 0.5 pm at 230 nm and about 7.2 pm
at 850 nm — validated by recording of I2 absorption spectra in the
visible using the same experimental set-up. O3 absorption spectra
at different concentrations were recorded at five different sample
temperatures in the range 203–293 K, and at each temperature at two
total pressures (100 and 1000 mbar) using O2/N2 mixtures as buffer
gas. Within the limits of experimental uncertainties, no influence
of total pressure on the O3 spectrum was observed in the entire region,
as expected from the short lifetimes of the upper electronic states
of O3. The temperature dependence of the O3 absorption cross sections
is particularly strong in the Huggins bands between 310 and 380 nm,
as observed in previous studies. An empirical formula is used to model
the temperature dependence of the O3 absorption cross sections between
236 and 362 nm, a spectral region that is particularly important for
atmospheric remote-sensing and for photochemical modelling.


## Header details from distributed Data Files¶

ESA Study 11340/95/NL/CN UV - Cross-Sections in the UV and Visible
O3 ABSORPTION CROSS-SECTIONS AT 203-293K
Low pressure = 100 mbar total pressure
High pressure = 1000 mbar total pressure
S. Voigt, J. Orphal, and J. P. Burrows
University of Bremen - Institute of Environmental Physics
P. O. Box 33 04 40
D-28334 Bremen, Germany
Tel. + 49 (0)421 218 3526
e-mail: Susanne.Voigt@iup.physik.uni-bremen.de
Wavelength range: 230 - 850 nm
Wavenumber range: 11752 - 43315 cm-1
Spectral Resolution: 5 cm-1
EXPERIMENTAL
Cell: Multiple reflection quartz cell (White optics)
optical pathlength 505 cm/120 cm (single path without White optics)

Spectrometer:  BRUKER IFS 120HR Fourier-Transform-Spectrometer
Wavenumber Range  Light Source      Detector
----------------  ------------      --------
29500-43500 cm-1  Xe lamp     UV diode
20000-33000 cm-1  Xe lamp     GaP diode
12000-25000 cm-1  QTH lamp    Si diode
Note: Spectral Regions are cutted and concatenated at 22000 cm-1, 31000 cm-1 and 33000 cm-1.