Infrared spectra of nitric acid trihydrate (β-NAT): A comparison of available optical constants and implication for the detection of polar stratospheric clouds (PSCs)

Details Infrared spectra of nitric acid trihydrate (β-NAT): A comparison of available optical constants and implication for the detection of polar stratospheric clouds (PSCs) Infrared spectra of nitric acid trihydrate (β-NAT): A comparison of available optical constants and implication for the detection of polar stratospheric clouds (PSCs)

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3319816o&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 19, CiteID L19816

Physics

Optics

3

Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Cloud Optics, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

The β phase of nitric acid trihydrate (β-NAT) is assumed to be one of the essential components of polar stratospheric clouds (PSC) and may play an important role in ozone chemistry. Infrared spectra of vapour deposited films of β-NAT, have been measured in transmission and in reflection-absorption (RAIR). The spectra have been simulated with the different sets of optical constants available in the literature. The films are found to be optically isotropic. The refractive indices of Toon et al. (1994) give the best global fit to the data, but have low resolution and tend to smooth sharp features. The higher resolution indices of Höpfner et al. (2006) lead to worse overall spectral simulations, but can account for the comparatively narrow feature at 820 cm-1 recently identified in field measurements of β-NAT particles. The best compromise is obtained with the ``coa'' indices of Höpfner et al.

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