Buffer-gas pressure broadening for the (0 0 0 3) ← (0 0 0 0) band of N 2 O measured with continuous-wave cavity ring-down spectroscopy Tomoki Nakayama, Hisato Fukuda, Akihiro Sugita, Satoshi Hashimoto and Masahiro Kawasaki* Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan Simone Aloisio California State University, Channel Islands, One University Drive, Camarillo, California 93012 Isamu Morino National Institute for Environmental Studies, Tsukuba, 305-8506, Japan Gen Inoue Graduate School for Environmental Studies, Nagoya University, Nagoya 464-8601, Japan Abstract Buffer-gas pressure broadening for the (0 0 0 3) ← (0 0 0 0) band of N 2 O was investigated with continuous wave cavity ring-down spectroscopy within the temperature range of 243-353 K. The measured absorption profiles were analyzed with Voigt functions. The pressure broadening coefficients, γ(gas), and the temperature dependent parameters (broadening exponent) were determined for a variety of buffer gases: N 2 , O 2 , He, Ne, Ar, Kr, and Xe. γ(air) values were also determined using γ(N 2 ) and γ(O 2 ). The effective potential well depth for (N 2 O) 2 under room temperature was estimated from γ(Ne, Ar, Kr, Xe) using the Permenter-Seaver′s model, and the results were compared with theoretical calculations. Simultaneously, the effective potential well depth for (CO 2 ) 2 is discussed. ---------------------------------------------------------------------------------------------- * corresponding author Fax; +81-75-383-2573, kawasaki@moleng.kyoto-u.ac.jp 1