Complex refractive indices in the infrared of nitric acid trihydrate aerosols
- Univ. of North Carolina, Chapel Hill, NC (United States); and others
The refractive indices of nitric acid trihydrate (NAT) have been determined from the infrared spectra of laboratory generated aerosols. The aerosols are formed via homogeneous nucleation in a flow cell with separate regions for nucleation and observation, allowing for independent control of the temperature conditions in these regions. A spectrum of small, non-scattering particles is recorded to determine the frequency dependent imaginary refractive index, within a scaling factor. A subtractive Kramers-Kronig routine is then used to calculate the real index. The scaling factor for the imaginary indices is determined by fitting a spectrum associated with larger, scattering particles, which depends on both the real and imaginary portions of the refractive indices. The complex refractive indices of NAT are reported over the range 700 cm{sup -1} to 4000 cm{sup -1}. While in good qualitative agreement with previously reported results, there are significant quantitative differences which are discussed. 21 refs., 3 figs.
- OSTI ID:
- 274080
- Journal Information:
- Geophysical Research Letters, Vol. 22, Issue 19; Other Information: PBD: 1 Oct 1995
- Country of Publication:
- United States
- Language:
- English
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