Look−up tables resolved by complex refractive index to correct particle sizes measured by common research−grade optical particle counters

Three types of files in ascii format are provided to the users:

1/ the values of scattering cross section Csca for particle diameters comprised between 0.02 and 200 µm in logarithmically-equal steps of 0.004 and as a function of CRI (n=1.33-1.75; ∆n=0.01, k=0, 0.4; ∆k=0.001) are provided in text files whose generic name is OPC_intensity_real_imag.txt, where OPC is the acronym of the particle counter, real is the value of the real part of the CRI, imag is the imaginary part of the CRI. Each file contains four columns, namely

- the real part of the CRI
- the imaginary part of the CRI
- the particle diameter used in equation 2 (in µm)
- the corresponding value of Csca (in µm2)

2/ the values of the corrected bin diameter as a function of CRI (n=1.33-1.75; ∆n=0.01, k=0, 0.4; ∆k=0.001) are provided in text files whose generic name is OPC_Diameter_real_imag.out, where OPC is the acronym of the particle counter, real is the value of the real part of the CRI, imag is the imaginary part of the CRI. Each file contains four columns, namely

- the nominal bin diameter (in µm) of the calibration CRI
- the bin diameter (in µm) calculated for the atmospheric CRI
- the bin midpoint diameter (Dmid, in µm) calculated for the atmospheric CRI
- the bin width (dlogD) calculated for the atmospheric CRI.

3/ For mineral dust particles, the values of the corrected bin diameter in aspherical approximation are provided in text files whose generic name is OPC_Diameter_non_spherical_1.53000_0.00300000i, where OPC is the acronym of the particle counter. The format is equivalent to that of files OPC_Diameter_real_imag.out.

- the nominal bin diameter (in µm) of the calibration CRI
- the bin diameter (in µm) calculated for the atmospheric CRI
- the bin midpoint diameter (Dmid, in µm) calculated for the atmospheric CRI
- the bin width (dlogD) calculated for the atmospheric CRI.