Ultra-violet absorption cross sections of isotopically substituted nitrous oxide species: 14N14NO, 15N14NO, 14N15NO and 15N15NO

[摘要] The isotopically substituted nitrous oxide species ¹⁴N¹⁴NO, ¹⁵N¹⁴NO,¹⁴N¹⁵NO and ¹⁵N¹⁵NO were investigated byultra-violet (UV) absorption spectroscopy. High precision cross sectionswere obtained for the wavelength range 181 to 218nm at temperatures of 233and 283K. These data are used to calculate photolytic isotopicfractionation constants as a function of wavelength. The fractionationconstants were used in a three-dimensional chemical transport model in orderto simulate the actual fractionation of N₂O in the stratosphere, andthe results were found to be in good agreement with field studies.

[学科分类] 大气科学