Accurate measurement of the refractive index of CO2, N2, He, O2, and air at 10.57 μ and T = 23 °C |
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Authors: | S Marchetti R Simili |
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Institution: | IPCF-CNR, Area della Ricerca del CNR, Via Moruzzi 1, 56124 Pisa, Italy |
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Abstract: | The refractive index of carbon-dioxide, nitrogen, helium, oxygen and air have been measured at 23 °C temperature by means of a tunable CO2 laser at 10.57 μm and of a differential interferometric technique. As the gas refractive index depends on the pressure P as n = 1 + PP, the pressure coefficients P has been measured with 5e–3 accuracy. |
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