High, room and low temperature photoabsorption cross sections of CS 2 in the 1800–2300 Å region

Using synchrotron radiation as a continuum light source, we have measured the absolute photoabsorption cross sections of CS 2 with a spectral bandwidth (FWHM) of 0.8 Å. The absorption cross sections of CS 2 have been measured from 1800 to 2300 Å at temperatures of 383 and 295 K and from 1800 to 2150 Å at 203 K. Significant temperature effects and hot bands are observed, particularly in the long wavelength region. The apparent continuum cross section underlying the vibrational features in the 2200–2300 Å region increases by about an order of magnitude when the gaseous CS 2 temperature increases from 295 K to 383 K. The new temperature‐dependent laboratory cross section data should be useful in the determination of the CS 2 abundance in Jupiter's atmosphere after the impact of Comet Shoemaker‐Levy 9.