Abstract
The absorption spectrum of sodium iodide vapor between 200 and 275cm−1 has been measured with a resolution of 0.006cm−1 at a temperature of 1096K. The Δv=1 transitions from v=1←0 to v=13←12 have been measured. Dunham constants are given from an least-squares analysis of 1285 fairly well resolved transitions. The band center for the fundamental band is ν0=257.2837±0.0002cm−1. The relative intensities of the Δv=1 transitions from different vibrational states are studied and it is shown that the intensity is roughly proportional to v″+1 as expected from the harmonic oscillator approximation. From measurements of the Herman–Wallis constant, α1,0=−0.0054±0.0008, it is estimated that the transition moment must be μ1,0≈0.135±0.020debye.
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