Abstract
A new interferometric method is used to determine the temperature dependence of the dispersion of the polarizability α of gaseous argon, hydrogen and oxygen, respectively. Although only the small wavelength range between 543·51 nm and 632·99 nm is covered, the data obtained in the temperature range 300 K < T < 1010 K are useful to derive important molecular properties like effective oscillator strengths and excitation energies, dispersion energy constants, and polarizability derivatives.

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