PRESSURE-SHIFT OF THE (0,0) AND (1,0) BANDS OF THE OXYGEN B(1)SIGMA(-X(3)SIGMA(-)(G) TRANSITION FROM FOURIER-TRANSFORM SPECTROSCOPY()(G))

The pressure shifts of the (0,0) and (1,0) bands of the b(1) Sigma(g)( +)-X(3) Sigma(g)(-) transition of oxygen (the so-called A and B bands) have been measured at room temperature in pure oxygen and in nitrogen using high-resolution Fourier transform spectroscopy. The average sel f-shift in the (1,0) band is -0.014 cm(-1) atm(-1), which is only slig htly larger than the average self-shift in the (0,0) band of -0.011 cm (-1) atm(-1). In both cases the shift is to lower wavenumber with incr easing pressure. The shift in the (0,0) band due to increasing pressur e of N-2 is significantly larger with a rotationally averaged value of -0.018 cm(-1) atm(-1). The rotational dependence of the pressure shif t has been measured in all cases and shows an increase in the shift of up to 50% with increasing N, with most of the change occurring at low N. The magnitude of these shifts is significant relative to the accur acy with which the absolute line positions have been measured and indi cates that correction for pressure is required if these lines are to b e used as reference lines in the atmosphere. (C) 1995 Academic Press, Inc.