Measurements of Foreign Gas Pressure Shift and Broadening Effects in the (1-0) Band of CO with N2 and Ar

Abstract

The pressure broadenings and shifts of rovibrational transitions of the CO fundamental band with foreign gases, Argon and Nitrogen, were measured by a tunable diode laser spectrometer. High J (≤34) R-branch and low J R- and P-branch transitions have been recorded with very high accuracy (5 × 10−5 cm−1). These highly accurate and very sensitive measurements became possible with a newly designed shock-isolated laser cold head and the application of an extremely stable 50-m multiple-path cell of the Herriott type. The accuracy of the line shift and broadening coefficients obtained in the present study is about 3 × 10−4 cm−1/bar.