OBSERVATION OF ELECTRIC QUADRUPOLE TRANSITIONS IN THE FUNDAMENTAL BAND OF $O_{2}$ NEAR $1600 cm^{-1}$

TL;DRAbstract

We have detected the electric quadrupole S(5) and S(7) transitions in the 1-0 band of $^{16}O_{2}$ using a tunable diode laser and a 40 m path of $O_{2}$ at pressures of 10 to 80 Torr. This the first observation of quadrupole vibrational transitions in a molecule other than hydrogen. Each transition is observed as a triplet due to the spin splitting of the $O_{2}$ rotational levels and the measured separations of the lines, in the 0.02 to $0.04 cm^{-1}$ range, agree with values derived from microwave spectroscopy of $O_{2}$. The total integrated intensity of the $O_{2}$ 1-0 quadrupole band was determined to be 1.77$\\pm0.63\\times0^{-5} \\mbox{cm}^{-1}$(m-amagat). We were not able to detect magnetic dipole transitions in the band, and thus determined a conservative upper limit of 0.86$\\times10^{-5} \\mbox{cm}^{-1}$ (m-amagat) for the strength of a magnetic dipole 1-0 band in $O_{2}$.

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