H₂¹⁶O hot bands in the 6·3 μm region

Abstract

Using a Fourier transform spectrum in the region 1750–2400 cm^-1, the intensity of about 60 lines of the 2v ₂ - v ₂, v ₁ - v ₂ and v ₃ - v ₂ hot bands have been measured. The constants involved in the rotational expansion of the transformed transition moment operators relative to these bands have been obtained through a fit of the measured line intensities, taking into account the interactions between the vibrational states (020), (100) and (001). For the first time, from these constants and results concerning the intensities for the v ₂, v ₁ + v ₂ and v ₂ + v ₃ bands the value of the coefficient ²³μz of the expansion of the dipole moment with respect to normal coordinates has been determined to be:

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Moreover the knowledge of the transformed transition moment operators has been used to compute the whole spectrum of the 2v ₂ - v ₂, v ₁ - v ₂ and v ₃ - v ₂ bands.