Knowledge Bank

Fourier transform spectroscopy is a well established technique for measuring high resolution emission and absorption spectra with quantitative intensities. However, only the FTS at the Physics Department of Imperial College in London is suitable for operation in the VUV region. At the 44th Symposium on Molecular Spectroscopy we presented the results from this UVFTS of the Fourth Positive bands of CO in emission with the resolution of $0.08cm-1$ in the wavelength region 177--215 nm. We now present the results of measurements with the UVFTS of $\delta$ bands of NO in absorption. A high current hydrogen lamp is used as the background continuum source with a 0.3 m grating spectrometer as a bandpath filter. Absorption bands of $\delta$(0,0) at 191 nm and $\delta$(1,0) at 183 nm are studied at 295 K and 78 K with the resolution of $0.08cm-1$. Rotational line assignments and band oscillator strengths of the both bands will be presented. This work is supported by NSF grant ATM-87-17875 to Harvard College Observatory.