ciddor equation

[bman!]

hi anyone here use the ciddor equation before?

supposedly theres an equation linking refractive index n of air to the wavelngth of light.

its an equation that i need, but for the life of me i cannot find it as its often on websites that you have to pay for and i have noi money.

would appreciate if someone could give it to me.

[Bob S]

Here it is:
http://emtoolbox.nist.gov/Wavelength/Ciddor.asp