Abstract
Measurements have been carried out with a tilting interference filter photometer. The filter is slowly tilted to vary the wavelength of peak transmission from 7403 A to 7300 A and explore the OH (8.3) rotation vibration band. The filtered light is detected by a photon counting system. Compared to other scanning spectrophotometers this is a compact instrument with a high throughput. For the reduction of the data, synthetic spectra were constructed by considering the transfer function of the instrument and assuming that the lines within the same band were in thermal equilibrium. An isothermal atmosphere was assumed at first. The contribution of all lines of the (8.3) OH band was considered and the excitation temperature was varied in steps of 20 from 120 to 400 K.
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