Spectrum of hot water in the 4750–13 000 cm−1 wavenumber range (0.769–2.1 μm)

A B S T R A C T The high resolution laboratory spectrum of hot water vapour has been recorded in the 500– 13000 cm −1 wavenumber range and we report on the analysis of the 4750–13000 cm −1 (0.769–2.1 µm)portion.Theemissionspectrumwasrecordedusinganoxy-acetylenewelding torch and a Fourier transform spectrometer. Line assignments in the laboratory spectrum as well as in an absorption spectrum of a sunspot umbra were made with the help of the BT2 line-list. Our torch spectrum is the first laboratory observation of the 9300 A ‘steam bands’ seen in M-stars and brown dwarfs.