کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5430154 | 1508709 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Experimental intercomparison of the absorption cross-sections of nitrous acid (HONO) in the ultraviolet and mid-infrared spectral regions Experimental intercomparison of the absorption cross-sections of nitrous acid (HONO) in the ultraviolet and mid-infrared spectral regions](/preview/png/5430154.png)
Nitrous acid, HONO, is an important trace gas in tropospheric photochemistry, because it is a source of OH radicals. In order to obtain HONO concentrations from spectroscopic measurements, the knowledge of accurate absorption cross-sections is essential. Furthermore, the ultraviolet absorption cross-sections of HONO determine its atmospheric photolysis rates, which are still being debated. In particular, in a recent field study focusing on the photolysis frequency of HONO, the absolute values of the ultraviolet absorption cross-sections have been proposed as a potential source for systematic errors. For these reasons, we have compared the absorption cross-sections for HONO in the infrared (IR) and ultraviolet (UV) by performing simultaneous measurements in both spectral regions. Assuming that the IR cross-sections (that show good agreement between different studies) are correct, our study shows a good agreement between the consistent infrared studies and some selected accurate UV spectra published previously (about 6%) while a rather large disagreement (about 22%) is observed when using other UV data sets.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 110, Issues 4â5, March 2009, Pages 256-263