Determination of the Absorbance Cross Sections for N2O5Band Systems in the Region 250–650 cm−1

✍ Scribed by J.W.Günter Seibert; Brenda P. Winnewisser; Manfred Winnewisser; Frank C. DeLucia; Paul Helminger; Gottfried Pawelke

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 294 KB
• Volume: 176
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0085

✦ Synopsis

Measurements of N 2 O 5 together with measurements of pure samples of the main decomposition products HNO 3 and N 2 O 4 in the spectral region 250-650 cm 01 have been carried out in the temperature range from room temperature down to 060ЊC at nine different temperatures and at resolutions (FWHM) of 0.067 and 0.0067 cm 01 . For the two lowest temperatures, 050 and 060ЊC, the absorbance cross sections of the 350 cm 01 band of N 2 O 5 could be determined and are equal to within the accuracy of the determination. The peak absorbance cross section averaged for these two lowest temperatures at 352.50 cm 01 is s peak Å (5.17 { 0.45) 1 10 019 cm 2 molecule 01 . A marked temperature dependence of the band shape, and reproducible fine structure at the lower temperatures, could be distinguished. The procedure yielded analogous data for the 570 cm 01 band, though with lower absolute accuracy. The peak absorbance cross section at 581.60 cm 01 is s peak Å (7.70 { 0.67) 1 10 019 cm 2 molecule 01 , averaged for 050 and 060ЊC.