colour.scattering_cross_section#
- colour.scattering_cross_section(wavelength: ArrayLike, CO2_concentration: ArrayLike = CONSTANT_STANDARD_CO2_CONCENTRATION, temperature: ArrayLike = CONSTANT_STANDARD_AIR_TEMPERATURE, avogadro_constant: ArrayLike = CONSTANT_AVOGADRO, n_s_function: Callable = air_refraction_index_Bodhaine1999, F_air_function: Callable = F_air_Bodhaine1999) NDArrayFloat [source]#
Return the scattering cross-section per molecule \(\sigma\) of dry air as function of wavelength \(\lambda\) in centimeters (cm) using given \(CO_2\) concentration in parts per million (ppm) and temperature \(T[K]\) in kelvin degrees following Van de Hulst (1957) method.
- Parameters:
wavelength (ArrayLike) – Wavelength \(\lambda\) in centimeters (cm).
CO2_concentration (ArrayLike) – \(CO_2\) concentration in parts per million (ppm).
temperature (ArrayLike) – Air temperature \(T[K]\) in kelvin degrees.
avogadro_constant (ArrayLike) – Avogadro’s number (molecules \(mol^{-1}\)).
n_s_function (Callable) – Air refraction index \(n_s\) computation method.
F_air_function (Callable) – \((6+3_p)/(6-7_p)\), the depolarisation term \(F(air)\) or King Factor computation method.
- Returns:
Scattering cross-section per molecule \(\sigma\) of dry air.
- Return type:
Warning
Unlike most objects of
colour.phenomena.rayleigh
module,colour.scattering_cross_section()
expects wavelength \(\lambda\) to be expressed in centimeters (cm).References
[BWDS99], [Wikipedia01d]
Examples
>>> scattering_cross_section(555 * 10e-8) 4.3466692...e-27