ELECTRONIC-SPECTRA OF HCL AND HF1

The absorption spectra of HCl and HF have been photographed at high dispersion in the vacuum ultraviolet region. In the HCl spectrum, many new band systems have been identified and 18 vibrational levels of the ionic B**1 SIGMA state have been observed. The B**1 SIGMA state is found to interact strongly with the Rydberg states. Although many bands have been analyzed, much of the HCl spectrum remains unassigned. Analyses of bands associated with the lowest discrete **1 PI and **3 PI states of HF are presented together with the analyses of two **1 PI -X**1 SIGMA band systems which lie between the first and second ionization limit. The spectrum of HF is very complex and little of it has been analyzed even though the spectral lines are sharp and well resolved. The theoretical problems in understanding the spectra of HCl and HF are discussed.