Diode laser spectroscopy of methyl chloride overtones at 850–860 nm

Abstract By using a tunable diode laser (TDL) spectrometer 156 CH 3 Cl overtone absorption lines have been detected in the range between 11,590 and 11,760 cm −1 (8500–8625 A). Their strengths range around 10 − 26 – 10 − 27 cm / molecule and have been measured by utilizing commercial AlGaAs/GaAs laser diodes through the wavelength modulation spectroscopy (WMS) and the 2nd harmonic (2 f ) detection techniques. For one line the self-broadening coefficient has been obtained.