Diode laser spectroscopy of methyl fluoride overtones at 850 nm

Abstract One hundred fifty-six 12 CH 3 F overtone absorption lines, comprised between 11 545 and 11 836 cm −1 , have been observed by using a tunable diode laser (TDL) spectrometer. Their intensities range around 10 −26  cm/molecule and have been measured by utilizing commercial AlGaAs/GaAs laser diodes through the wavelength modulation (WM) and the 2nd harmonic (2 f ) detection techniques. Self-broadening coefficients and line strengths have been measured at room temperature for seven of the strongest transitions, while air-broadening coefficients have been obtained for two lines. In addition, self- and air-collisional shifts have been measured for the 11 564.25 cm −1 transition.