science-softCon uv/vis+ photochemistry database;	www.photochemistry.org; (C) science-softCon 2019

Substance: water					Other Names: 

Formula: H2O						CAS-No.: 7732-18-5

Study: UV absorption cross sections

                
Authors: C.A. Cantrell, A. Zimmer, G.S. Tyndall

Title: Absorption cross sections for water vapor from 183 to 193 nm

Journal/Source: Geophys. Res. Lett., 24, 2195-2198, (1997); doi:10.1029/97GL02100


Data: table, diagram

Energy/Wavelength range: 183 - 193 nm

Resolution: 

Temperature: 298 K

Temperature dependence: yes

Pressure/Concentration: 

Phase: vapor

pH:


Comments: Absorption cross sections were measured between 0 and 80 degrees C. The results from these 
experiments yield a cross section of 7.14 (± 0.2) × 10-20 cm2 molecule-1 at 25°C with a small positive temperature 
dependence (about 4% between 0 and 80°C). 
The absorption spectrum was also measured at discrete wavelengths between 183 and 193 nm using a scanning 
double monochromator system. Water vapor absorption cross-section at 184.9 nm was determined to be 
(7.14 ± 0.1) x 10-20 cm2/molecule. The cross section of deuterated water vapor was determined at 184.9 nm.

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