Absorption coefficients of Cl2 at high temperatures

Quantitative optical tomographic imaging of a supersonic jet

“…The cross section has no pressure dependence, and temperature causes a variation of only 5% over the entire expansion, which corresponds to temperatures of 250 K and below. 11 There is a range of plenum (upstream) pressures that yield large absorptions yet neither cause the chlorine to condense nor make the back (downstream) pressure too high. As the back pressure rises, the size of the expansion decreases, and the absorption in the background gas becomes significant.…”

Monitoring Cl_2 using a differential absorption lidar system

“…The investigated region was 298-308 nm yielding a maximum differential absorption cross section Δσ a = 7.5 X 10 -24 m 2 estimated from Ref. 5. To make sure that there are no finer details in the spectrum, the dye laser was scanned in the 298-308-nm region, and the absorption spectrum was recorded through a 30-cm quartz cell filled with a Cl 2 /N 2 reference gas.…”

“…The maximum absorption cross section at 328 nm is σ a = 2.7 X 10 -23 m 2 at room temperature. 5 To obtain a large differ ential absorption cross section the two DIAL wavelengths must be as far apart as possible on the slope of the absorption profile. With the rhodamine 640 dye a wavelength differ ence of up to 10 nm could be obtained in the UV region with sufficient output power.…”