INTENSITIES AND LINE SHAPES OF THE FUNDAMENTAL VIBRATION ROTATION BAND OF HF -- AND OTHER INFRARED STUDIES

An account is given of the results achieved, in a study of intensities, widths and shapes of vibration-rotation lines in the spectrum of HF; and in other problems in infrared spectroscopy. A general description is given of the vacuumgrating spectrometer with which the measurements were made. Special technical problems are discussed which are encountered in radiation source stabilization; optical problems--including filtering, focussing, stray light, gratings, etc.; the gas handling system--including the peculiar case of HF, system layout, and absorption cells; calibration techniques--including the neon hollow-cathode discharge tube, standard lines, overlapping grating orders, and accuracy; data taking and handling--including discussion of slit functions and corrections, and examples of lines for which corrections were made. Results are shown in tables of appropriate slit functions, percent transmission for all the HF lines in the P and R branches recorded for various cell lengths and pressures. A reprint is included of a paper entitled Rotational Fine Structure in the Dimer of HF (J. Opt. Soc. America 50: 1264, (1960)) in which resolution of the dimer spectrum of HF is discussed. Brief discussions are given on remeasurement of the fundamental bands of CH3Cl and on the conversion of a Perkin-Elmer model 12 spectrometer to far infrared operation for the study of intensities of the pure rotation lines of HF. (Author)