Buffer-gas pressure broadening for the (0 0 0 3) ← (0 0 0 0) band of N 2O 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 2O 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 2O) 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.