Buffer-gas pressure broadening for the (0 00 3) ← (0 00 0) band of N2O measured with continuous-wave cavity ring-down spectroscopy

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.