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We have used a highly sensitive cavity-enhanced frequency modulationspectroscopy technique to measure different parameters of the ultraweaktransitions of a${^1}{\triangle}_g{\leftarrow}$X $^3{\Sigma}^{-}_g$ $(0,0)$band of molecular oxygen in the range 7640 cm$^{-1}$ to 7917 cm$^{-1}$. Theself-broadened half-width and air-broadened half-width of the transitions havebeen measured for three different pressures for both $^{16}$O$_2$ and$^{18}$O$_2$. To measure the line intensity and self-broadened half-width wehave used ultra pure oxygen sample and air-broadened half-width was measuredwith dry air sample. The $(0,0)$ band of $^{16}$O$_2$ and $^{18}$O$_2$ showweak quadrupole transitions with line intensities ranging from$1\times10^{-30}$ to $1.9\times10^{-28}$ cm/molecule. The measurements are inexcellent agreement with the recent measurement of Rothman et. al

High precision measurement of ultraweak transitions of the a${^1}{\triangle}_g{\leftarrow}$X $^3{\Sigma}^{-}_g$ $(0,0)$ band of molecular oxygen