($DL_{3}$ LAST MINUTE ADDITION TO THE PROGRAM) Q BRANCHES OF THE $\nu_{2}$ BAND OF $^{13}C^{16}O^{17}O,\  ^{13}C^{17}O_{2}, \ ^{13}C4^{17}O^{18}O$ AND $^{13}C^{18}O_{2}$

( $DL_{3}$ LAST MINUTE ADDITION TO THE PROGRAM) Q BRANCHES OF THE $\nu_{2}$ BAND OF $^{13}C^{16}O^{17}O,\ ^{13}C^{17}O_{2}, \ ^{13}C4^{17}O^{18}O$ AND $^{13}C^{18}O_{2}$

Author Institution:A diode laser has been employed to examine the Q branch absorption lines of the

\nu_{2}

band for the following

CO_{2}

isotopes:

^{13}C^{16}O^{17}O,\ ^{13}C^{17}O_{2}, \ ^{13}C4^{17}O^{18}O

AND

^{13}C^{18}O_{2}

, and

^{13}C^{18}O_{2}

. An analysis of the relative frequency spacing between the absorption lines yielded the following values for

\Delta B

expressed in units of

10^{-3}

cm^{-1}

: 1.016(2) for

^{13}C^{16}O^{17}O, 0.964(1)

for

^{13}C^{17}O^{2}

, 0.9163(3) for

^{13}C^{17}O^{18} O

and 0.891(2) for

^{13}C^{17}O_{2}

. Values for

\nu_{o}

, the band origin, were also obtained by super-imposing on the spectra known absorption lines of

^{12}C^{16}O_{2}

and

^{12}C^{16}O^{18}O

. The following values were obtained for

\nu_{o}: 645.7440(2)

for

^{13}C^{16}O^{17}O, 643.0064(1)

for

^{13}C^{17}O_{2}, 640.5680(1)

for

^{13}C^{17}O^{18}O

and 638.1149(5) for

^{13}C^{18}O_{2}

. The above listed errors for

\nu_{o}

are associated only with the statistical fitting of the data; the absolute accuracy depends upon the

^{12}C^{16}O_{2}

reference lines which are known to about

\pm 0.001

cm^{-1}

. A comparison of the diode laser results are made with previous measurements utilizing Fourier transform spectroscopy

Last time updated on 15/02/2017