Abstract
A tunable diode laser spectrometer has been employed to examine the 3rd overtone absorption lines of C 2H 4 at around 12 000 cm −1 (830 nm). The spectrometer sources are heterostructure AlGaAs tunable diode lasers operating “free-running”. By the aid of the wavelength modulation spectroscopy with the second harmonic detection technique and a Herriott type multipass cell 63 very weak absorption lines have been observed for the first time, with cross sections as low as 2 × 10 −26 cm 2/mol, equivalent to ≅ 0.05 km − 1 / amagat . The self-broadening coefficient has been measured for one of the most intense lines.
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