Rotational line strengths and self-pressure-broadening coefficients for the 1.27- μm, a↑(1) Δ↓(g) - X↑(3) ∑↓(g)↑(-), v = 0-0 band of O↓(2)

摘要

We measured at 296 K the rotational line strengths and pressure-broadening coefficients for the 1.27-μm, a ↑(1) Δ↓(g)-X↑(3)∑↓(g) ↑(-), v = 0-0 band of O↓(2) with a Fourier transform infrared spectrometer using an optical path length of 84 m, a spectral resolution of 0.01 cm↑(-1), and sample pressures between 13 and 104 kPa. The integrated band strength is 7.79(17) × 10↑(-6) m↑(-2) Pa↑(-1) [7.89(17) × 10↑(-5) cm↑(-2) atm↑(-l)], and the Einstein A coefficient for spontaneous emission is 2.237(51) × 10↑(-4) s↑(-1), which corresponds to an upper-state 1/e lifetime of 1.24(3) h. The pressure-broadening coefficients decrease with increasing N and range from 19 to 38 MHz/kPa (FWHM). The mean value for the transitions studied is 30.3(21) MHz/kPa [0.1024(71)cm↑(-1)/atm] (FWHM). The Einstein A coefficient determined here is in good agreement with the widely accepted value of 2.58 × 10↑(-4)s↑(-1) initially obtained by Badger et al. [J. Chem. Phys. 43, 4345 (1965)] more than 30 years ago. The standard uncertainties given above are one standard deviation. OCIS codes: 010.1320, 010.4950, 020.3690, 300.6300, 300.1030, 010.0010.