Line shapes and half widths of pure- and foreign-gas-broadened 2.5-μm HF absorption spectra

The absorption line shapes of the R₁(1)-R₁(5) lines of HF have been measured as a function of pressure for pure HF and with Ar and Kr as buffer gases by means of a cw tunable FB (II)-type color-center laser operating in the wavelength range from 2.25 to 2.65 {μ}m. Line-broadening coefficients are determined and Einstein A coefficients are evaluated from the line shapes. Collisional narrowing is observed for the R₁(4) line with Kr as the buffer gas.