Knowledge Bank

Line positions and intensities of carbon dioxide transitions in the $2395-2680cm-1$ spectral interval have been determined from long-path, low-pressure absorption spectra recorded at $0.01-cm-1$ resolution and at room temperature using the Fourier transform spectrometer in the McMath solar telescope complex at Kitt Peak National Observatory. A total of 17 bands belonging to the $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O2,\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O,\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">17</mrow>}O$, and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$ molecular species have been identified and unambiguous assignments have been made for over 1000 lines. Absolute intensities have been derived for unblended lines of the various bands using a nonlinear least squares spectral fitting technique. For these measurements, the gas pressures ranged from 3 to 10 Torr in a 384 m absorption path. The measured intensities have been analyzed to determine vibrational band intensities and F-factor coefficients for the bands.