Pressure-shift measurements of the oxygen A-band by Fourier-transform spectroscopy

The pressure shifts, <f>δ</f>, of the (0–0) band of the <f>b1Σg+–X3Σg−</f> electronic transition of oxygen (the so-called ‘A-band’) have been measured at room temperature using high-resolution Fourier transform spectroscopy. The rotational dependence of <f>δ</f> has been measured and characterised; the average value of the shift over the whole band is <f>−0.009±0.001 cm−1 atm−1</f>. No significant variation in <f>δ</f> is found for different <f>O2</f> mixing ratios in <f>N2</f>, and the results presented here are therefore appropriate for high-resolution atmospheric applications using the <f>O2</f> A-band. [Copyright &y& Elsevier]