Characteristics of CH_4 Spectroscopy at Low Temperature Near 1.65μm

The absorption spectral parameters are important when the parameters are used to sense and model the atmospheres of the Earth and the outer planets,especially in low temperature.Sometimes CH_4 parameters listed in the HITRAN database are uncertain to some extent.In order to measure the low temperature absorption spectroscopy of methane,a newly developed cryogenic cell by ourselves was used in combination with a distributed feedback(DFB) diode laser as the light source and low temperature absorption spectroscopy of methane at 1.65μm were measured.The low temperature absorption spectroscopy of methane at 6039.70 cm~(-1) is given for example and the method to measure the temperature-dependent exponent of self-broadening coefficient of methane are discussed.